# Maintained by Axel Boldt (boldt@math.ucsb.edu) # # This version of the Linux kernel configuration help texts # corresponds to the kernel versions 2.1.x. Be aware that these are # development kernels and need not be completely stable. # # Translations of this file available on the WWW: # - http://jf.gee.kyoto-u.ac.jp/JF/JF-ftp/euc/Configure.help.euc # is a Japanese translation, maintained by Tetsuyasu YAMADA # (tetsu@cauchy.nslab.ntt.jp). # - http://nevod.perm.su/service/linux/doc/kernel/Configure.help # is a Russian translation, maintained by kaf@linux.nevod.perm.su. # - http://www.linux-kheops.com/traduc/kernels/ # has a French translation of the whole kernel, including # Configure.help. This is maintained by David Bourgin # (dbourgin@wsc.com). # - ftp://ftp-pavia1.linux.it/pub/linux/Configure.help # is a work-in-progress effort of the Italian translation team, # currently only for the 2.0 version of this file, maintained # by rubini@linux.it. # - http://www.cs.net.pl/~cezar/Kernel is the beginning of a Polish # translation of the 2.0 version of this file, maintained by Cezar # Cichocki (cezar@cs.net.pl). # # Information about what a kernel is, what it does, how to patch and # compile it and much more is contained in the Kernel-HOWTO, available # via ftp (user: anonymous) from sunsite.unc.edu in the directory # /pub/Linux/docs/HOWTO. Before you start compiling, make sure that # you have the necessary versions of all programs and libraries # required to compile and run this kernel; they are listed in the file # Documentation/Changes. Make sure to read the toplevel kernel README # file as well. # # Format of this file: descriptionvariablehelptext. If # the question being documented is of type "choice", we list only the # first occurring config variable. The help texts may contain empty # lines, but every non-empty line must be indented two positions. # Order of the help texts does not matter, however, no variable should # be documented twice: if it is, only the first occurrence will be # used by Configure. We try to keep the help texts of related variables # close together. Lines starting with `#' are ignored. To be nice to # menuconfig, limit your line length to 70 characters. Use emacs' # kfill.el to edit and ispell.el to spell check this file or you lose. # # If you add a help text to this file, please try to be as gentle as # possible. Don't use unexplained acronyms and generally write for the # hypothetical ignorant but intelligent user who has just bought a PC, # removed Windows, installed Linux and is now recompiling the kernel # for the first time. Tell them what to do if they're unsure. Technical # information should go in a README in the Documentation directory. # Mention all the relevant READMEs and HOWTOs in the help text. # Repetitions are fine since the help texts are not meant to be read # in sequence. # # All this was shamelessly stolen from several different sources. Many # thanks to all the contributors. Feel free to use these help texts in # your own kernel configuration tools. The texts are copyrighted (c) # 1995-1998 by Axel Boldt and many others and are governed by the GNU # General Public License. Prompt for development and/or incomplete code/drivers CONFIG_EXPERIMENTAL Some of the various things that Linux supports (such as network drivers, filesystems, network protocols, etc.) can be in a state of development where the functionality, stability, or the level of testing is not yet high enough for general use. This is usually known as the "alpha-test" phase amongst developers. If a feature is currently in alpha-test, then the developers usually discourage uninformed widespread use of this feature by the general public to avoid "Why doesn't this work?" type mail messages. However, active testing and use of these systems is welcomed. Just be aware that it may not meet the normal level of reliability or it may fail to work in some special cases. Detailed bug reports from people familiar with the kernel internals are usually welcomed by the developers (before submitting bug reports, please read the documents README, MAINTAINERS, Documentation/BUG-HUNTING, and Documentation/oops-tracing.txt in the kernel source). Unless you intend to help test and develop a feature or driver that falls into this category, or you have a situation that requires using these features you should probably say N here, which will cause this configure script to present you with fewer choices. If you say Y here, you will be offered the choice of using features or drivers that are currently considered to be in the alpha-test phase. Kernel math emulation CONFIG_MATH_EMULATION Linux can emulate a math coprocessor (used for floating point operations) if you don't have one. 486DX and Pentium processors have a math coprocessor built in, 486SX and 386 do not, unless you added a 487DX or 387, respectively. (The messages during boot time can give you some hints here ["man dmesg"].) Everyone needs either a coprocessor or this emulation. If you don't have a math coprocessor, you need to say Y here; if you say Y here even though you have a coprocessor, the coprocessor will be used nevertheless. (This behavior can be changed with the kernel command line option "no387", which comes handy if your coprocessor is broken. Try "man bootparam" or see the documentation of your boot loader (lilo or loadlin) about how to pass options to the kernel at boot time. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO.) This means that it is a good idea to say Y here if you intend to use this kernel on different machines. More information about the internals of Linux math coprocessor emulation can be found in arch/i386/math-emu/README. If you are not sure, say Y; apart from resulting in a 45kB bigger kernel, it won't hurt. Normal floppy disk support CONFIG_BLK_DEV_FD If you want to use your floppy disk drive(s) under Linux, say Y. Information about this driver, especially important for IBM Thinkpad users, is contained in drivers/block/README.fd. This file also contains the location of the Floppy driver FAQ as well as location of the fdutils package used to configure additional parameters of the driver at run time. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called floppy.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. RAM disk support CONFIG_BLK_DEV_RAM Saying Y here will allow you to use a portion of your RAM memory as a block device, so that you can make filesystems on it, read and write to it and do all the other things that you can do with normal block devices (such as hard drives). It is usually used to load and store a copy of a minimal root file system off of a floppy into RAM during the initial install of Linux. Note that the kernel command line option "ramdisk=XX" is now obsolete. For details, read Documentation/ramdisk.txt. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M and read Documentation/modules.txt. The module will be called rd.o. Most normal users won't need the RAM disk functionality, and can thus say N here. Initial RAM disk (initrd) support CONFIG_BLK_DEV_INITRD The initial RAM disk is a RAM disk that is loaded by the boot loader (loadlin or lilo) and that is mounted as root before the normal boot procedure. It is typically used to load modules needed to mount the "real" root file system, etc. See Documentation/initrd.txt for details. Loop device support CONFIG_BLK_DEV_LOOP Saying Y here will allow you to mount a file as a file system. This is useful if you want to check an ISO9660 file system before burning the CD, or want to use floppy images without first writing them to floppy. This option also allows you to mount a filesystem with encryption. To use these features, you need a recent version of mount (available via ftp (user: anonymous) from ftp://ftp.win.tue.nl/pub/linux/util/). Note that this loop device has nothing to do with the loopback device used for network connections from the machine to itself. Most users will answer N here. Network Block Device support CONFIG_BLK_DEV_NBD Saying Y here will allow your computer to serve as a client for network block devices - it will be able to use block devices exported by servers (mount filesystems on them etc.). Communication between client and server works over TCP/IP networking, but to the client program this is hidden: it looks like a regular local file access to a special file such as /dev/nd0. It also allows you to run a block-device in userland (making server and client physically the same computer, communicating using the loopback network device). Read Documentation/nbd.txt for details. Note that this has nothing to do with the network file system NFS; you can say N here even if you intend to use NFS. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called nbd.o. If unsure, say N. Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support CONFIG_BLK_DEV_IDE If you say Y here, you will use the full-featured IDE driver to control up to four IDE interfaces, each being able to serve a "master" and a "slave" device, for a total of up to eight IDE disk/cdrom/tape/floppy drives. Useful information about large (>540MB) IDE disks, sound card IDE ports, module support, and other topics, is contained in Documentation/ide.txt. For detailed information about hard drives, consult the Disk-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. To fine-tune IDE drive/interface parameters for improved performance, look for the hdparm package at sunsite.unc.edu:/pub/Linux/kernel/patches/diskdrives/ If you have one or more IDE drives, say Y here. If your system has no IDE drives, or if memory requirements are really tight, you could say N here, and select the "Old hard disk driver" instead to save about 13kB of memory in the kernel. Old hard disk (MFM/RLL/IDE) driver CONFIG_BLK_DEV_HD_ONLY There are two drivers for MFM/RLL/IDE hard disks. Most people use the newer enhanced driver, but this old one is still around for two reasons. Some older systems have strange timing problems and seem to work only with the old driver (which itself does not work with some newer systems). The other reason is that the old driver is smaller, since it lacks the enhanced functionality of the new one. This makes it a good choice for systems with very tight memory restrictions, or for systems with only older MFM/RLL/ESDI drives. Choosing the old driver can save 13kB or so of kernel memory. If you are unsure, then just choose the Enhanced IDE/MFM/RLL driver instead of this one. For more detailed information, read the Disk-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Use old disk-only driver on primary interface CONFIG_BLK_DEV_HD_IDE There are two drivers for MFM/RLL/IDE disks. Most people use just the new enhanced driver by itself. This option however installs the old hard disk driver to control the primary IDE/disk interface in the system, leaving the new enhanced IDE driver to take care of only the 2nd/3rd/4th IDE interfaces. Doing this will prevent you from having an IDE/ATAPI CDROM or tape drive connected to the primary IDE interface. Choosing this option may be useful for older systems which have MFM/RLL/ESDI controller+drives at the primary port address (0x1f0), along with IDE drives at the secondary/3rd/4th port addresses. Normally, just say N here; you will then use the new driver for all 4 interfaces. Include IDE/ATA-2 DISK support CONFIG_BLK_DEV_IDEDISK This will include enhanced support for MFM/RLL/IDE hard disks. If you have a MFM/RLL/IDE disk, and there is no special reason to use the old hard disk driver instead, say Y. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ide-disk.o. Do not compile this driver as a module if your root filesystem (the one containing the directory /) is located on the IDE disk. If unsure, say Y. Include IDE/ATAPI CDROM support CONFIG_BLK_DEV_IDECD If you have a CDROM drive using the ATAPI protocol, say Y. ATAPI is a new protocol used by IDE CDROM and TAPE drives, similar to the SCSI protocol. Most new CDROM drives use ATAPI, including the NEC-260, Mitsumi FX400, Sony 55E, and just about all non-SCSI double(2X), quad(4X), and six(6X) speed drives. If you say Y here, the CDROM drive will be identified at boot time along with other IDE devices, as "hdb" or "hdc", or something similar (check the boot messages with dmesg). If this is your only CDROM drive, you can say N to all other CDROM options, but be sure to say Y to "ISO9660 cdrom filesystem support". Read the CDROM-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO and the file Documentation/cdrom/ide-cd. Note that older versions of lilo (the Linux boot loader) cannot properly deal with IDE/ATAPI CDROMs, so install lilo-16 or higher, available from ftp://sunsite.unc.edu/pub/Linux/system/Linux-boot/lilo. If you want to compile the driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ide-cd.o. Include IDE/ATAPI TAPE support CONFIG_BLK_DEV_IDETAPE If you have an IDE tape drive using the ATAPI protocol, say Y. ATAPI is a new protocol used by IDE tape and CDROM drives, similar to the SCSI protocol. If you say Y here, the tape drive will be identified at boot time along with other IDE devices, as "hdb" or "hdc", or something similar, and will be mapped to a character device such as "ht0" (check the boot messages with dmesg). Be sure to consult the drivers/block/ide-tape.c and Documentation/ide.txt files for usage information. If you want to compile the driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ide-tape.o. Include IDE/ATAPI FLOPPY support CONFIG_BLK_DEV_IDEFLOPPY If you have an IDE floppy drive which uses the ATAPI protocol, say Y. ATAPI is a new protocol used by IDE CDROM/tape/floppy drives, similar to the SCSI protocol. IDE floppy drives include the LS-120 and the ATAPI ZIP (ATAPI PD-CD/CDR drives are not supported by this driver; support for PD-CD/CDR drives is available if you say Y to "SCSI emulation support", below). If you say Y here, the FLOPPY drive will be identified along with other IDE devices, as "hdb" or "hdc", or something similar (check the boot messages with dmesg). If you want to compile the driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ide-floppy.o. SCSI emulation support CONFIG_BLK_DEV_IDESCSI This will provide SCSI host adapter emulation for IDE ATAPI devices, and will allow you to use a SCSI device driver instead of a native ATAPI driver. This is useful if you have an ATAPI device for which no native driver has been written (for example, an ATAPI PD-CD or CDR drive); you can then use this emulation together with an appropriate SCSI device driver. If both this SCSI emulation and native ATAPI support are compiled into the kernel, the native support will be used. Normally, say N. CMD640 chipset bugfix/support CONFIG_BLK_DEV_CMD640 The CMD-Technologies CMD640 IDE chip is used on many common 486 and Pentium motherboards, usually in combination with a "Neptune" or "SiS" chipset. Unfortunately, it has a number of rather nasty design flaws that can cause severe data corruption under many common conditions. Say Y here to include code which tries to automatically detect and correct the problems under Linux. This option also enables access to the secondary IDE ports in some CMD640 based systems. This driver will work automatically in PCI based systems (most new systems have PCI slots). But if your system uses VESA local bus (VLB) instead of PCI, you must also supply a kernel boot parameter to enable the CMD640 bugfix/support: "ide0=cmd640_vlb". (Try "man bootparam" or see the documentation of your boot loader about how to pass options to the kernel. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO.) The CMD640 chip is also used on add-in cards by Acculogic, and on the "CSA-6400E PCI to IDE controller" that some people have. For details, read Documentation/ide.txt. If unsure, say Y. CMD640 enhanced support CONFIG_BLK_DEV_CMD640_ENHANCED This option includes support for setting/autotuning PIO modes and prefetch on CMD640 IDE interfaces. For details, read Documentation/ide.txt. If you have a CMD640 IDE interface and your BIOS does not already do this for you, then say Y here. Otherwise say N. RZ1000 chipset bugfix/support CONFIG_BLK_DEV_RZ1000 The PC-Technologies RZ1000 chip is used on many common 486 and Pentium motherboards, usually along with the "Neptune" chipset. Unfortunately, it has a rather nasty design flaw that can cause severe data corruption under many conditions. Say Y here to include code which automatically detects and corrects the problem under Linux. This may slow disk throughput by a few percent, but at least things will operate 100% reliably. If unsure, say Y. Generic PCI IDE chipset support CONFIG_BLK_DEV_IDEPCI Enable this for PCI systems which use IDE drive(s). This option helps the IDE driver to automatically detect and configure all PCI-based IDE interfaces in your system. It is safe to say Y to this question. Generic PCI bus-master DMA support CONFIG_BLK_DEV_IDEDMA If your PCI system uses IDE drive(s) (as opposed to SCSI, say) and is capable of bus-master DMA operation (most Pentium PCI systems), you will want to say Y here to reduce CPU overhead. With this option, Linux will automatically enable DMA transfers in most cases, noting this with "DMA" appended to the drive identification info. You can also use the "hdparm" utility to enable DMA for drives which were not enabled automatically. You can get the latest version of the hdparm utility via anonymous FTP from ftp://sunsite.unc.edu/pub/Linux/system/hardware/. Read the comments at the beginning of drivers/block/idedma.c and the file Documentation/ide.txt for more information. It is safe to say Y to this question. Other IDE chipset support CONFIG_IDE_CHIPSETS Say Y here if you want to include enhanced support for various IDE interface chipsets used on motherboards and add-on cards. This enhanced support may be necessary for Linux to be able to access the 3rd/4th drives in some systems. It may also enable setting of higher speed I/O rates to improve system performance with these chipsets. Most of these also require special kernel boot parameters to actually turn on the support at runtime. Generic 4 drives/port support CONFIG_BLK_DEV_4DRIVES Certain older chipsets, including the Tekram 690CD, use a single set of I/O ports at 0x1f0 to control up to four drives, instead of the customary two drives per port. Support for this can be enabled at runtime using the "ide0=four" kernel boot parameter if you say Y here. DTC-2278 support CONFIG_BLK_DEV_DTC2278 This driver is enabled at runtime using the "ide0=dtc2278" kernel boot parameter. It enables support for the secondary IDE interface of the DTC-2278 card, and permits faster I/O speeds to be set as well. See the Documentation/ide.txt and dtc2278.c files for more info. Holtek HT6560B support CONFIG_BLK_DEV_HT6560B This driver is enabled at runtime using the "ide0=ht6560b" kernel boot parameter. It enables support for the secondary IDE interface of the Holtek card, and permits faster I/O speeds to be set as well. See the Documentation/ide.txt and ht6560b.c files for more info. PROMISE DC4030 support (EXPERIMENTAL) CONFIG_BLK_DEV_PDC4030 This driver provides support for the secondary IDE interface and cache of Promise IDE chipsets, e.g. DC4030 and DC5030. This driver is known to incur timeouts/retries during heavy I/O to drives attached to the secondary interface. CDROM and TAPE devices are not supported yet. This driver is enabled at runtime using the "ide0=dc4030" kernel boot parameter. See the Documentation/ide.txt and drivers/block/pdc4030.c files for more info. PS/2 ESDI hard disk support CONFIG_BLK_DEV_PS2 Say Y here if you have a PS/2 machine with a MCA bus and an ESDI hard disk. Tekram TRM290 chipset support (EXPERIMENTAL) CONFIG_BLK_DEV_TRM290 This driver adds support for bus master DMA transfers using the Tekram TRM290 PCI IDE chip. Volunteers are needed for further tweaking and development. Please read the comments at the top of drivers/block/trm290.c. OPTi 82C621 enhanced support (EXPERIMENTAL) CONFIG_BLK_DEV_OPTI621 This is a driver for the OPTi 82C621 EIDE controller. Please read the comments at the top of drivers/block/opti621.c. NS87415 support (EXPERIMENTAL) CONFIG_BLK_DEV_NS87415 This driver adds detection and support for the NS87415 chip (used in SPARC64, among others). Please read the comments at the top of drivers/block/ns87415.c. QDI QD6580 support CONFIG_BLK_DEV_QD6580 This driver is enabled at runtime using the "ide0=qd6580" kernel boot parameter. It permits faster I/O speeds to be set. See the Documentation/ide.txt and qd6580.c files for more info. UMC 8672 support CONFIG_BLK_DEV_UMC8672 This driver is enabled at runtime using the "ide0=umc8672" kernel boot parameter. It enables support for the secondary IDE interface of the UMC-8672, and permits faster I/O speeds to be set as well. See the Documentation/ide.txt and umc8672.c files for more info. ALI M14xx support CONFIG_BLK_DEV_ALI14XX This driver is enabled at runtime using the "ide0=ali14xx" kernel boot parameter. It enables support for the secondary IDE interface of the ALI M1439/1443/1445/1487/1489 chipsets, and permits faster I/O speeds to be set as well. See the Documentation/ide.txt and ali14xx.c files for more info. Apple Macintosh builtin IDE interface support (EXPERIMENTAL) CONFIG_BLK_DEV_MAC_IDE This is the IDE driver for the builtin IDE interface on some Apple Macintosh models. It supports both the Quadra/Performa/LC 630 and the PowerBook 190 IDE interface. Say Y if you have such a Macintosh model and want to use IDE devices (hard disks, CD-ROM drives, etc.) that are connected to the builtin IDE interface. XT hard disk support CONFIG_BLK_DEV_XD Very old 8 bit hard disk controllers used in the IBM XT computer. To include a driver for these, say Y. If you want to compile the driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called xd.o. It's pretty unlikely that you have one of these: say N. Parallel port IDE device support CONFIG_PARIDE There are many external CD-ROM and disk devices that connect through your computer's parallel port. Most of them are actually IDE devices using a parallel port IDE adapter. This option enables the PARIDE subsystem which contains drivers for many of these external drives. Read linux/Documentation/paride.txt for more information. If you have said Y to the "Parallel-port support" configuration option, you may share a single port between your printer and other parallel port devices. Answer Y to build PARIDE support into your kernel, or M if you would like to build it as a loadable module. If your parallel port support is in a loadable module, you must build PARIDE as a module. If you built PARIDE support into your kernel, you may still build the individual protocol modules and high-level drivers as loadable modules. If you build this support as a module, it will be called paride.o. To use the PARIDE support, you must say Y or M here and also to at least one high-level driver (e.g. "Parallel port IDE disks", "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and to at least one protocol driver (e.g. "ATEN EH-100 protocol", "MicroSolutions backpack protocol", "DataStor Commuter protocol" etc.). Parallel port IDE disks CONFIG_PARIDE_PD This option enables the high-level driver for IDE-type disk devices connected through a parallel port. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the parallel port IDE driver, otherwise you should answer M to build it as a loadable module. The module will be called pd.o. You must also have at least one parallel port protocol driver in your system. Among the devices supported by this driver are the SyQuest EZ-135, EZ-230 and SparQ drives, the Avatar Shark and the backpack hard drives from MicroSolutions. Parallel port ATAPI CD-ROMs CONFIG_PARIDE_PCD This option enables the high-level driver for ATAPI CD-ROM devices connected through a parallel port. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the parallel port ATAPI CD-ROM driver, otherwise you should answer M to build it as a loadable module. The module will be called pcd.o. You must also have at least one parallel port protocol driver in your system. Among the devices supported by this driver are the MicroSolutions backpack CD-ROM drives and the Freecom Power CD. If you have such a CD-ROM drive, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. Parallel port ATAPI disks CONFIG_PARIDE_PF This option enables the high-level driver for ATAPI disk devices connected through a parallel port. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the parallel port ATAPI disk driver, otherwise you should answer M to build it as a loadable module. The module will be called pf.o. You must also have at least one parallel port protocol driver in your system. Among the devices supported by this driver are the MicroSolutions backpack PD/CD drive and the Imation Superdisk LS-120 drive. Parallel port ATAPI tapes CONFIG_PARIDE_PT This option enables the high-level driver for ATAPI tape devices connected through a parallel port. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the parallel port ATAPI disk driver, otherwise you should answer M to build it as a loadable module. The module will be called pt.o. You must also have at least one parallel port protocol driver in your system. Among the devices supported by this driver is the parallel port version of the HP 5GB drive. ATEN EH-100 protocol CONFIG_PARIDE_ATEN This option enables support for the ATEN EH-100 parallel port IDE protocol. This protocol is used in some inexpensive low performance parallel port kits made in Hong Kong. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called aten.o. You must also have a high-level driver for the type of device that you want to support. MicroSolutions backpack protocol CONFIG_PARIDE_BPCK This option enables support for the MicroSolutions backpack parallel port IDE protocol. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called bpck.o. You must also have a high-level driver for the type of device that you want to support. DataStor Commuter protocol CONFIG_PARIDE_COMM This option enables support for the Commuter parallel port IDE protocol from DataStor. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called comm.o. You must also have a high-level driver for the type of device that you want to support. DataStor EP-2000 protocol CONFIG_PARIDE_DSTR This option enables support for the EP-2000 parallel port IDE protocol from DataStor. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called dstr.o. You must also have a high-level driver for the type of device that you want to support. Shuttle EPAT/EPEZ protocol CONFIG_PARIDE_EPAT This option enables support for the EPAT parallel port IDE protocol. EPAT is a parallel port IDE adapter manufactured by Shuttle Technology and widely used in devices from major vendors such as Hewlett-Packard, SyQuest, Imation and Avatar. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called epat.o. You must also have a high-level driver for the type of device that you want to support. Shuttle EPIA protocol CONFIG_PARIDE_EPIA This option enables support for the (obsolete) EPIA parallel port IDE protocol from Shuttle Technology. This adapter can still be found in some no-name kits. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called epia.o. You must also have a high-level driver for the type of device that you want to support. FreeCom power protocol CONFIG_PARIDE_FRPW This option enables support for the Freecom power parallel port IDE protocol. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called frpw.o. You must also have a high-level driver for the type of device that you want to support. KingByte KBIC-951A/971A protocols CONFIG_PARIDE_KBIC This option enables support for the KBIC-951A and KBIC-971A parallel port IDE protocols from KingByte Information Corp. KingByte's adapters appear in many no-name portable disk and CD-ROM products, especially in Europe. If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called kbic.o. You must also have a high-level driver for the type of device that you want to support. OnSpec 90c20 protocol CONFIG_PARIDE_ON20 This option enables support for the (obsolete) 90c20 parallel port IDE protocol from OnSpec (often marketed under the ValuStore brand name). If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called on20.o. You must also have a high-level driver for the type of device that you want to support. OnSpec 90c26 protocol CONFIG_PARIDE_ON26 This option enables support for the 90c26 parallel port IDE protocol from OnSpec Electronics (often marketed under the ValuStore brand name). If you chose to build PARIDE support into your kernel, you may answer Y here to build in the protocol driver, otherwise you should answer M to build it as a loadable module. The module will be called on26.o. You must also have a high-level driver for the type of device that you want to support. Multiple devices driver support CONFIG_BLK_DEV_MD This driver lets you combine several hard disk partitions into one logical block device. This can be used to combine several redundant hard disks to a RAID1/4/5 device so as to provide protection against hard disk failures. More information and the necessary tools are available over ftp (user: anonymous) from ftp://sweet-smoke.ufr-info-p7.ibp.fr/pub/Linux in the md package and the md-FAQ. Please read drivers/block/README.md and the relevant section of the Disk-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If unsure, say N. Linear (append) mode CONFIG_MD_LINEAR If you say Y here, then your multiple devices driver will be able to use the so-called linear mode, i.e. it will combine the hard disk partitions by simply appending one to the other. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called linear.o. If unsure, say Y. RAID-0 (striping) mode CONFIG_MD_STRIPED If you say Y here, then your multiple devices driver will be able to use the so-called raid0 mode, i.e. it will combine the hard disk partitions into one logical device in such a fashion as to fill them up evenly, one chunk here and one chunk there. This will increase the throughput rate if the partitions reside on distinct disks. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called raid0.o. If unsure, say Y. Are you using a crosscompiler CONFIG_CROSSCOMPILE Set this if you are using another architecture to compile the kernel for your MIPS machine. Support for Acer PICA 1 chipset CONFIG_ACER_PICA_61 This is a machine with a R4400 133/150 MHz CPU. To compile a Linux kernel that runs on these, say Y here. For details about Linux on the MIPS architecture, check out the Linux/MIPS FAQ on the WWW at http://lena.fnet.fr/ (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Support for Algorithmics P4032 CONFIG_ALGOR_P4032 This is an evaluation board of the British company Algorithmics. The board uses the R4300 and a R5230 CPUs. For more information about this board see www.algor.co.uk. RAID-1 (mirroring) mode CONFIG_MD_MIRRORING A RAID-1 set consists of several disk drives which are exact copies of each other. In the event of a mirror failure, the RAID driver will continue to use the operational mirrors in the set, providing an error free MD (multiple device) to the higher levels of the kernel. In a set with N drives, the available space is the capacity of a single drive, and the set protects against a failure of (N - 1) drives. Raidtools, a set of user-space tools which create and maintain RAID1/4/5 sets, is available at: ftp://ftp.kernel.org/pub/linux/daemons/raid http://luthien.nuclecu.unam.mx/~miguel/raid If you want to use such a RAID-1 set, say Y. This code is also available as a module called raid1.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say Y. Boot support (linear, striped) CONFIG_MD_BOOT To boot with an initial linear or striped md device you have to say Y here. For lilo and loadlin options see Documentation/md.txt. RAID-4/RAID-5 mode CONFIG_MD_RAID5 A RAID-5 set of N drives with a capacity of C MB per drive provides the capacity of C * (N - 1) drives, and protects against a failure of a single drive. For a given sector (row) number, (N - 1) drives contain data sectors, and one drive contains the parity protection. For a RAID-4 set, the parity blocks are present on a single drive, while a RAID-5 set distributes the parity across the drives in one of the available parity distribution methods. Raidtools, a set of user-space tools which create and maintain RAID1/4/5 sets, is available at: ftp://ftp.kernel.org/pub/linux/daemons/raid http://luthien.nuclecu.unam.mx/~miguel/raid If you want to use such a RAID-5 set, say Y. This code is also available as a module called raid5.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say Y. Support for Mips Magnum 4000 CONFIG_MIPS_MAGNUM_4000 This is a machine with a R4000 100 MHz CPU. To compile a Linux kernel that runs on these, say Y here. For details about Linux on the MIPS architecture, check out the Linux/MIPS FAQ on the WWW at http://lena.fnet.fr/ (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Support for Olivetti M700 CONFIG_OLIVETTI_M700 This is a machine with a R4000 100 MHz CPU. To compile a Linux kernel that runs on these, say Y here. For details about Linux on the MIPS architecture, check out the Linux/MIPS FAQ on the WWW at http://lena.fnet.fr/ (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). CPU type CONFIG_CPU_R3000 Give the type of your machine's MIPS CPU. For this question, it suffices to give a unique prefix of the option you want to choose. In case of doubt select the R3000 CPU. This kernel will run on other MIPS machines but with slightly reduced performance. Compile the kernel into the ECOFF object format CONFIG_ECOFF_KERNEL Some machines require a kernel in the ECOFF format. You will have to Choose this option for example if you want to a Mips Magnum 3000 or a DECstation over network. Generate little endian code CONFIG_CPU_LITTLE_ENDIAN Some MIPS machines can be configured for either little or big endian byte order. Both modes require different kernels. Say yes if your machine is little endian, no if it's a big endian machine. Kernel support for IRIX binaries CONFIG_BINFMT_IRIX This option enables the kernel support for IRIX binaries. Running IRIX binaries additionally requires IRIX libraries. Networking support CONFIG_NET Unless you really know what you are doing, you should say Y here. The reason is that some programs need kernel networking support even when running on a stand-alone machine that isn't connected to any other computer. If you are upgrading from an older kernel, you should consider updating your networking tools too because changes in the kernel and the tools often go hand in hand. The tools are contained in the package net-tools, the location and version number of which are given in Documentation/Changes. Network aliasing CONFIG_NET_ALIAS If you say Y here, you will be able to set multiple network addresses on the same low-level network device driver. This is typically used for services that act differently based on the address they listen on (e.g. "multihosting" or "virtual domains" or "virtual hosting services" on the web server apache and the ftp server wuftpd -- read the Virtual-Services-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO) or for connecting to different logical networks through the same physical interface (most commonly an Ethernet networking card). See Documentation/networking/alias.txt for more info. This is the generic part, later when configuring network protocol options you will be asked for protocol-specific aliasing support, and you will have to say Y to at least one of them, most likely to "IP: aliasing support". If you need this feature (for any protocol, like IP) say Y; if unsure, say N. Socket filtering CONFIG_FILTER The Linux Socket Filter is derived from the Berkeley Packet Filter. If you say Y here, user-space programs can attach a filter to any socket and thereby tell the kernel that it should allow or disallow certain types of data to get through the socket. Linux Socket Filtering works on all socket types except TCP for now. See the text file linux/Documentation/networking/filter.txt for more information. If unsure, say N. Network firewalls CONFIG_FIREWALL A firewall is a computer which protects a local network from the rest of the world: all traffic to and from computers on the local net is inspected by the firewall first, and sometimes blocked or modified. The type of firewall you'll get if you say Y here is called a "packet filter": it can block network traffic based on type, origin and destination. By contrast, "proxy-based" firewalls are more secure but more intrusive and more bothersome to set up; they inspect the network traffic much more closely, modify it and have knowledge about the higher level protocols, which packet filters lack. They also often require changes in the programs running on the local clients. Proxy-based firewalls don't need support by the kernel, but they are often combined with packet filters, which only works if you say Y here. If you want to configure your Linux box as a packet filter firewall for a local network, say Y here. If your local network is TCP/IP based, you will then also have to say Y to "IP: firewalling", below. You also need to say Y here and to "IP firewalling" below in order to be able to use IP masquerading (i.e. local computers can chat with an outside host, but that outside host is made to think that it is talking to the firewall box -- makes the local network completely invisible to the outside world and avoids the need to allocate globally valid IP host addresses for the machines on the local net) and IP packet accounting (keeping track of what is using up all your network bandwidth) and IP transparent proxying (makes the computers on the local network think they're talking to a remote computer, while in reality the traffic is redirected by your Linux firewall to a local proxy server). Make sure to say N to "Fast switching" below if you intend to say Y here. Chances are that you should say Y here for every machine which is run as a router and N for every regular host. If unsure, say N. SYN flood protection CONFIG_SYN_COOKIES Normal TCP/IP networking is open to an attack known as "SYN flooding". This denial-of-service attack prevents legitimate remote users from being able to connect to your computer and requires very little work from the attacker, who can operate from anywhere on the Internet. SYN cookies provide protection against this type of attack. If you say Y here, the TCP/IP stack will use a cryptographic challenge protocol known as "SYN cookies" to enable legitimate users to continue to connect, even when your machine is under attack. There is no need for the legitimate users to change their TCP/IP software; SYN cookies work transparently to them. For technical information about SYN cookies, check out ftp://koobera.math.uic.edu/pub/docs/syncookies-archive. If you say Y here, note that SYN cookies aren't enabled by default; you can enable them by saying Y to "/proc filesystem support" and "Sysctl support" below and executing the command echo 1 >/proc/sys/net/ipv4/tcp_syncookies at boot time after the proc filesystem has been mounted. If unsure, say Y. Sun floppy controller support CONFIG_BLK_DEV_SUNFD This is support for floppy drives on Sun Sparc workstations. Say Y if you have a floppy drive, otherwise N. Easy. Alpha system type CONFIG_ALPHA_AVANTI Find out what type of Alpha motherboard you have. You will probably want to read the Linux/Alpha homepage on the WWW at http://www.azstarnet.com/~axplinux/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and also the Alpha-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. For this question, it suffices to give a unique prefix of the option you want to choose. The choices: ** Avanti: This is for Mustang (AS200), M3 (AS250), Avanti (AS400) AlphaStations. These usually come with a TGA graphics adapter, so you'll want to say Y to "TGA Console support", below, if you have one of these. ** Alpha-XL: A.k.a. "Windows NT Dream Machine" :-) These usually come with a TGA graphics adapter, so you'll want to say Y to "TGA Console support", below, if you have one of these. ** Jensen: a.k.a. DEC 2000 a.k.a. DECpc AXP 150, the oldest Alpha PC; it sports an EISA bus. The boot process on Jensen machines is difficult (no booting from floppies, MILO doesn't work). You need to have access to a second Linux workstation. The Linux/Alpha FAQ, accessible from the above mentioned WWW page, has details. ** Noname: a.k.a. AXPpci33, a PCI-bus based board using the 21066 Alpha CPU, running at either 166 or 233 MHz. You also want to choose this option if you have a UDB (Universal Desktop Box a.k.a. Multia) machine. ** Cabriolet: also called AlphaPC64, a PCI-bus based board using the 21064 Alpha CPU typically running at 275 or 300 MHz. ** EB66: "Evaluation Board" ** EB66+: "Evaluation Board" ### ### Add info about Platform2000, EB164, etc. ### Using SRM as bootloader CONFIG_ALPHA_SRM There are two different types of booting firmware on Alphas: SRM, which is command line driven, and ARC, which uses menus and arrow keys. Details about the Linux/Alpha booting process are contained in the Linux/Alpha FAQ, accessible on the WWW from http://www.azstarnet.com/~axplinux/ (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). The usual way to load Linux on an Alpha machine is to use MILO (a bootloader that lets you pass command line parameters to the kernel just like lilo does for the x86 architecture) which can be loaded either from ARC or can be installed directly as a permanent firmware replacement from floppy (which requires changing a certain jumper on the motherboard). If you want to do either of these, say N here. If MILO doesn't work on your system (true for Jensen motherboards), you can bypass it altogether and boot Linux directly from an SRM console; say Y here in order to do that. Note that you won't be able to boot from an IDE disk using SRM. If unsure, say N. Non-standard serial port support CONFIG_SERIAL_NONSTANDARD Say Y here if you have any non-standard serial boards --- boards which aren't supported using the standard "dumb" serial driver. This includes intelligent serial boards such as Cyclades, Digiboards, etc. These are usually used for systems that need many serial ports because they serve many terminals or dial-in connections. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about non-standard serial boards. Most people can say N here. Extended dumb serial driver options CONFIG_SERIAL_EXTENDED If you wish to use any non-standard features of the standard "dumb" driver, say Y here. This includes HUB6 support, shared serial interrupts, special multiport support, support for more than the four COM 1/2/3/4 boards, etc. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about serial driver options. If unsure, say N. Support more than 4 serial ports CONFIG_SERIAL_MANY_PORTS Say Y here if you have dumb serial boards other than the four standard COM 1/2/3/4 ports. This may happen if you have an AST FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini), or other custom serial port hardware which acts similar to standard serial port hardware. If you only use the standard COM 1/2/3/4 ports, you can say N here to save some memory. You can also say Y if you have an "intelligent" multiport card such as Cyclades, Digiboards, etc. Support for sharing serial interrupts CONFIG_SERIAL_SHARE_IRQ Some serial boards have hardware support which allows multiple dumb serial ports on the same board to share a single IRQ. To enable support for this in the serial driver, say Y here. Autodetect IRQ on standard ports (unsafe) CONFIG_SERIAL_DETECT_IRQ Enable this option if you want the kernel to try to guess which IRQ is configured during the boot sequence and you're too lazy to edit the boot scripts to use the setserial command. This option can be unsafe and should not be enabled on most machines. It is far better to dynamically request autoconfiguration during the boot-time scripts using the setserial command. You can change the IRQ and/or request automatic IRQ configuration at any time by using the "setserial" program. I wouldn't include this config option at all except people keep bellyaching about it. I guess they are really are too lazy to edit their boot scripts. :-) If unsure, say No. Support special multiport boards CONFIG_SERIAL_MULTIPORT Some multiport serial ports have special ports which are used to signal when there are any serial ports on the board which need servicing. Say Y here to enable the serial driver to take advantage of those special I/O ports. SGI Zilog85C30 serial support CONFIG_SGI_SERIAL If you want to use your SGI's built-in serial ports under Linux, say Y. SGI graphics support CONFIG_SGI_GRAPHICS If you have an SGI machine and you want to compile the graphic drivers select this option. This will include the code for the /dev/graphics and /dev/gfx drivers into the kernel for supporting the virtualized access to your graphics hardware. Remote GDB kernel debugging CONFIG_REMOTE_DEBUG This enables remote debugging support for the MIPS kernel. Enabling this option enlarges you kernel image disk size by several megabytes and requires a machine with more than 16mb, better 32mb RAM to avoid excessive linking time. Support the Bell Technologies HUB6 card CONFIG_HUB6 Say Y here to enable support in the dumb serial driver to support the HUB6 card. TGA Console Support CONFIG_TGA_CONSOLE Many Alpha systems (e.g the Multia) are shipped with a graphics card that implements the TGA interface (much like the VGA standard, but older TGA adapters are *not* VGA compatible). On such systems, you should say Y here so that the TGA driver rather than the standard VGA driver is used. PCI support CONFIG_PCI Find out whether you have a PCI motherboard. PCI is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. Other bus systems are ISA, EISA, Microchannel (MCA) or VESA. If you have PCI, say Y, otherwise N. The PCI-HOWTO, available via ftp (user: anonymous) in sunsite.unc.edu:/pub/Linux/docs/HOWTO, contains valuable information about which PCI hardware does work under Linux and which doesn't. If some of your PCI devices don't work and you get a warning during boot time ("man dmesg"), please follow the instructions at the top of include/linux/pci.h. PCI BIOS support CONFIG_PCI_BIOS If you have enabled PCI bus support above, you probably want to allow Linux to use your PCI BIOS to detect the PCI devices and determine their configuration. Note: some old PCI motherboards have BIOS bugs and may crash if you say Y here -- for such motherboards, you should say N here and say Y to "PCI direct access support" instead. Except for some special cases (embedded systems with no BIOS), you probably should say Y here. PCI direct access support CONFIG_PCI_DIRECT If you don't want to use the PCI BIOS (e.g., because you run some embedded system with no BIOS at all) or Linux says it cannot use your PCI BIOS, you can enable direct PCI hardware here. It might fail if your machine is based on some unusual chipset, but it usually works. If both PCI BIOS and direct PCI access are enabled, the use of BIOS is preferred. If unsure, say Y. PCI quirks CONFIG_PCI_QUIRKS If you have a broken BIOS, it may fail to set up the PCI bus in a correct or optimal fashion. If your BIOS is fine you can say N here for a very slightly smaller kernel. If unsure, say Y. PCI bridge optimization (experimental) CONFIG_PCI_OPTIMIZE This can improve access times for some hardware devices if you have a really broken BIOS and your computer uses a PCI bus system. Set to Y if you think it might help, but try turning it off if you experience any problems with the PCI bus. N is the safe answer. Backward-compatible /proc/pci CONFIG_PCI_OLD_PROC Older kernels supported a /proc/pci file containing brief textual descriptions of all PCI devices in the system. Several programs tried to parse this file, so it became almost impossible to add new fields without breaking compatibility. So a new /proc interface to PCI (/proc/bus/pci) has been implemented and the old one is supported for compatibility reasons only; you'll get the old one (in addition to the new one) if you say Y here and to "/proc filesystem support", below. If unsure, say Y. If you say Y here and to the "/proc filesystem support" below, you will get a directory /proc/pci with information about your PCI hardware. If unsure, say Y. MCA support CONFIG_MCA MicroChannel Architecture is found in some IBM PS/2 machines and laptops. It is a bus system similar to PCI or ISA. See Documentation/mca.txt (and especially the web page given there) before attempting to build an MCA bus kernel. Note that this is still experimental code. System V IPC CONFIG_SYSVIPC Inter Process Communication is a suite of library functions and system calls which let processes (= running programs) synchronize and exchange information. It is generally considered to be a good thing, and some programs won't run unless you say Y here. In particular, if you want to run the DOS emulator dosemu under Linux (read the DOSEMU-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO), you'll need to say Y here. You can find documentation about IPC with "info ipc" and also in section 6.4 of the Linux Programmer's Guide, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/LDP/programmers-guide. Saying Y here enlarges your kernel by about 7kB. Just say Y. BSD Process Accounting CONFIG_BSD_PROCESS_ACCT If you say Y here, a user level program will be able to instruct the kernel (via a special system call) to write process accounting information to a file: whenever a process exits, information about that process will be appended to the file by the kernel. The information includes things such as creation time, owning user, command name, memory usage, controlling terminal etc. (the complete list is in the struct acct in include/linux/acct.h). It is up to the user level program to do useful things with this information. This is generally a good idea, so say Y. Sysctl support CONFIG_SYSCTL The sysctl interface provides a means of dynamically changing certain kernel parameters and variables on the fly without requiring a recompile of the kernel or reboot of the system. The primary interface consists of a system call, but if the /proc filesystem is enabled, a tree of modifiable sysctl entries will be generated beneath the /proc/sys directory. They are explained in the files in Documentation/sysctl/. Note that enabling this option will enlarge the kernel by at least 8kB. As it is generally a good thing, you should say Y here unless building a kernel for install/rescue disks or your system is very limited in memory. Kernel support for ELF binaries CONFIG_BINFMT_ELF ELF (Executable and Linkable Format) is a format for libraries and executables used across different architectures and operating systems. Saying Y here will enable your kernel to run ELF binaries and enlarge it by about 2kB. ELF support under Linux has now all but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC) because it is portable (this does *not* mean that you will be able to run executables from different architectures or operating systems!) and makes building run-time libraries very easy. Many new executables are distributed solely in ELF format. You definitely want to say Y here. Information about ELF is on the WWW at http://www.sjc.ox.ac.uk/users/barlow/elf-howto.html (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). If you find that after upgrading from Linux kernel 1.2 and saying Y here, you still can't run any ELF binaries (they just crash), then you'll have to install the newest ELF runtime libraries, including ld.so (check the file Documentation/Changes for location and latest version). If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called binfmt_elf.o. Saying M or N here is dangerous because some crucial programs on your system might be in ELF format. Kernel support for A.OUT binaries CONFIG_BINFMT_AOUT A.out (Assembler.OUTput) is a set of formats for libraries and executables used in the earliest versions of UNIX. Linux used the a.out formats QMAGIC and ZMAGIC until they were replaced with the ELF format. As more and more programs are converted to ELF, the use for a.out will gradually diminish. If you disable this option it will reduce your kernel by one page. This is not much and by itself does not warrant removing support. However its removal is a good idea if you wish to ensure that absolutely none of your programs will use this older executable format. If you don't know what to answer at this point then answer Y. If someone told you "You need a kernel with QMAGIC support" then you'll have to say Y here. You may answer M to compile a.out support as a module and later load the module when you want to use a program or library in a.out format. The module will be called binfmt_aout.o. Saying M or N here is dangerous though, because some crucial programs on your system might still be in A.OUT format. Kernel support for JAVA binaries (obsolete) CONFIG_BINFMT_JAVA JAVA(tm) is an object oriented programming language developed by SUN; JAVA programs are compiled into "JAVA bytecode" binaries which can then be interpreted by run time systems on many different architectures and operating systems. These JAVA binaries are becoming a universal executable format. If you want to execute JAVA binaries, read the Java on Linux HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. You will then need to install the run time system contained in the Java Developers Kit (JDK) as described in the HOWTO. This is completely independent of the Linux kernel and you do NOT need to say Y here for this to work. Saying Y here allows you to execute a JAVA bytecode binary just like any other Linux program: by simply typing in its name. (You also need to have the JDK installed for this to work). As more and more Java programs become available, the use for this will gradually increase. You can even execute HTML files containing JAVA applets (= JAVA binaries) if those files start with the string "". If you want to use this, say Y here and read Documentation/java.txt. If you disable this option it will reduce your kernel by about 4kB. This is not much and by itself does not warrant removing support. However its removal is a good idea if you do not have the JDK installed. You may answer M for module support and later load the module when you install the JDK or find an interesting Java program that you can't live without. The module will be called binfmt_java.o. The complete functionality of this Java support is also provided by the more general option "Kernel support for MISC binaries", below. This option is therefore considered obsolete and you should say N here and Y to "Kernel support for MISC binaries" if you're interested in transparently executing Java programs. Kernel support for Linux/Intel ELF binaries CONFIG_BINFMT_EM86 Say Y here if you want to be able to execute Linux/Intel ELF binaries just like native Alpha binaries on your Alpha machine. For this to work, you need to have the emulator /usr/bin/em86 in place. You may answer M to compile the emulation support as a module and later load the module when you want to use a Linux/Intel binary. The module will be called binfmt_em86.o. If unsure, say Y. Kernel support for MISC binaries CONFIG_BINFMT_MISC This enables the possibility to plug wrapper-driven binary formats into the kernel. You will like this especially when you use programs that need an interpreter to run like Java, Python or Emacs-Lisp. Once you have registered such a binary class with the kernel, you can start such a program simply by typing in its name; Linux will feed it to the correct interpreter. If you say Y here, you won't need "Kernel support for JAVA binaries" (CONFIG_BINFMT_JAVA) or "Kernel support for Linux/Intel ELF binaries" (CONFIG_BINFMT_EM86), as this is a more general solution. You can do other nice things, too. Read Documentation/binfmt_misc.txt to learn how to use this feature, and Documentation/java.txt for information about how to include Java support. You must enable the "proc filesystem support" (CONFIG_PROC_FS) to use this part of the kernel. You may answer M for module support and later load the module when you have use for it; the module is called binfmt_misc.o. If you don't know what to answer at this point, say Y. Solaris binary emulation CONFIG_SOLARIS_EMUL This is experimental code which will enable you to run (many) Solaris binaries on your Sparc Linux machine. This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called solaris.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Processor family CONFIG_M386 This is the processor type of your CPU. This information is used for optimizing purposes. In order to compile a kernel that can run on all x86 CPU types (albeit not optimally fast), you can specify "386" here. If you specify one of "486" or "Pentium" or "PPro", then the kernel will run on all of these CPUs: 486 and Pentium (=586) and Pentium Pro (=686). In rare cases, it can make sense to specify "Pentium" even if running on a 486: the kernel will be smaller but slower. If you have a single processor machine, make sure that the line "SMP=1" at the top of the toplevel kernel Makefile is commented out; if you have a multi processor machine and want Linux to use all the processors in parallel (Symmetric Multi Processing), make sure that the line "SMP=1" is not commented out and read Documentation/smp and Documentation/IO-APIC.txt and the SMP-FAQ on the WWW at http://www.irisa.fr/prive/mentre/smp-faq/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). People using multiprocessor machines should also say Y to "Enhanced Real Time Clock Support", below. If you want to compile a kernel that should work on both single processor and multi processor machines, it is possible to set SMP=1. The "Advanced Power Management" code (see configuration option below) will not work in that scenario, though. In addition, the kernel will be slower on single processor machines, and other problems may appear, so this is not recommended. If you don't know what to do, choose "386". Video mode selection support CONFIG_VIDEO_SELECT This enables support for text mode selection on kernel startup. If you want to take advantage of some high-resolution text mode your card's BIOS offers, but the traditional Linux utilities like SVGATextMode don't, you can say Y here and set the mode using the "vga=" option from your boot loader (lilo or loadlin) or set "vga=ask" which brings up a video mode menu on kernel startup. Try "man bootparam" or see the documentation of your boot loader about how to pass options to the kernel. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Read Documentation/svga.txt for more information about the Video mode selection support. If unsure, say N. Parallel-port support CONFIG_PARPORT If you want to use devices connected to your machine's parallel port (the connector at the computer with 25 holes), e.g. printer, Zip drive, PLIP link (Parallel Line Internet Protocol is mainly used to create a mini network by connecting the parallel ports of two local machines) etc., then you need to say Y here; please read Documentation/parport.txt and drivers/misc/BUGS-parport. For extensive information about drivers for many devices attaching to the parallel port see http://www.torque.net/linux-pp.html on the WWW (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). It is possible to share a single parallel port among several devices and it is safe to compile all the corresponding drivers into the kernel. If you want to compile parallel port support as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called parport.o. If you have more than one parallel port and want to specify which port and IRQ to be used by this driver at module load time, read Documentation/networking/net-modules.txt. If unsure, say Y. PC-style hardware CONFIG_PARPORT_PC You should say Y here if you have a PC-style parallel port. All IBM PC compatible computers and some Alphas have PC-style parallel ports. This code is also available as a module. If you want to it as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called parport_pc.o. If unsure, say Y. Support foreign hardware CONFIG_PARPORT_OTHER Say Y here if you want to be able to load driver modules to support other non-standard types of parallel ports. This causes a performance loss, so most people say N. Sun Ultra/AX-style hardware CONFIG_PARPORT_AX Say Y here if you need support for the parallel port hardware on Sun Ultra/AX machines. This code is also available as a module (say M), called parport_ax.o. If in doubt, saying N is the safe plan. Generate little endian code CONFIG_CPU_LITTLE_ENDIAN If your compiler is mipsel-linux-gcc or mipsel-linuxelf-gcc (as opposed to mips-linux-gcc or mips-linuxelf-gcc), say Y here, otherwise N. Most MIPS machines use little-endian code, but it might be necessary to run older Mips systems, such as the Sony News and MIPS RC3xxx, in big endian mode. Build fp execption handler module CONFIG_MIPS_FPE_MODULE Build the floating point exception handler module. This option is only useful for people working on the floating point exception handler. If you don't, say n. Plug and Play support CONFIG_PNP Plug and Play support allows the kernel to automatically configure some peripheral devices. Say Y to enable PnP. Auto-probe for parallel devices CONFIG_PNP_PARPORT Some IEEE-1284 conforming parallel-port devices can identify themselves when requested. Say Y to enable this feature, or M to compile it as a module (parport_ieee1284.o). If in doubt, say N. Enable loadable module support CONFIG_MODULES Kernel modules are small pieces of compiled code which can be inserted in or removed from the running kernel, using the programs insmod and rmmod. This is described in the file Documentation/modules.txt, including the fact that you have to say "make modules" in order to compile the modules that you chose during kernel configuration. Modules can be device drivers, file systems, binary executable formats, and so on. If you think that you may want to make use of modules with this kernel in the future, then say Y here. If unsure, say Y. Set version information on all symbols for modules CONFIG_MODVERSIONS Usually, modules have to be recompiled whenever you switch to a new kernel. Saying Y here makes it possible, and safe, to use the same modules even after compiling a new kernel; this requires the program modprobe. All the software needed for module support is in the modutils package (check the file Documentation/Changes for location and latest version). NOTE: if you say Y here but don't have the program genksyms (which is also contained in the above mentioned modutils package), then the building of your kernel will fail. If you are going to use modules that are generated from non-kernel sources, you would benefit from this option. Otherwise it's not that important. So, N ought to be a safe bet. Kernel module loader support CONFIG_KMOD Normally when you have selected some drivers and/or filesystems to be created as loadable modules, you also have the responsibility to load the corresponding modules (using the programs insmod or modprobe) before you can use them. If you say Y here however, the kernel will be able to load modules for itself: when a part of the kernel needs a module, it runs modprobe with the appropriate arguments. (This is a replacement for kerneld.) Say Y here and read about configuring it in Documentation/kmod.txt. ARP daemon support (EXPERIMENTAL) CONFIG_ARPD Normally, the kernel maintains an internal cache which maps IP addresses to hardware addresses on the local network, so that Ethernet/Token Ring/ etc. frames are sent to the proper address on the physical networking layer. For small networks having a few hundred directly connected hosts or less, keeping this address resolution (ARP) cache inside the kernel works well. However, maintaining an internal ARP cache does not work well for very large switched networks, and will use a lot of kernel memory if TCP/IP connections are made to many machines on the network. If you say Y here, the kernel's internal ARP cache will never grow to more than 256 entries (the oldest entries are expired in a LIFO manner) and communication will be attempted with the user space ARP daemon arpd. Arpd then answers the address resolution request either from its own cache or by asking the net. This code is still experimental. If you do say Y here, you should obtain a copy of arpd from http://www.loran.com/~layes/arpd/index.html, and you should also say Y to "Kernel/User network link driver", below. If unsure, say N. TCP/IP networking CONFIG_INET These are the protocols used on the Internet and on most local Ethernets. The safest is to say Y here (which will enlarge your kernel by about 35 kB), since some programs (e.g. the X window system) use TCP/IP even if your machine is not connected to any other computer. You will get the so-called loopback device which allows you to ping yourself (great fun, that!). This option is also necessary if you want to use the full power of term (term is a program which gives you almost full Internet connectivity if you have a regular dial up shell account on some Internet connected Unix computer. Read http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html). If you say Y here and also to "/proc filesystem support" and "Sysctl support" below, you can change various aspects of the behavior of the TCP/IP code by writing to the (virtual) files in /proc/sys/net/ipv4/*; the options are explained in the file Documentation/Networking/ip-sysctl.txt. Short answer: say Y. IP: multicasting CONFIG_IP_MULTICAST This is code for addressing several networked computers at once, enlarging your kernel by about 2 kB. You need multicasting if you intend to participate in the MBONE, a high bandwidth network on top of the Internet which carries audio and video broadcasts. More information about the MBONE is on the WWW at http://www.best.com/~prince/techinfo/mbone.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Information about the multicast capabilities of the various network cards is contained in Documentation/networking/multicast.txt. For most people, it's safe to say N. IP: advanced router CONFIG_IP_ADVANCED_ROUTER If you intend to run your Linux box mostly as a router, i.e. as a computer that forwards and redistributes network packets, say Y; you will then be presented with several options that allow more precise control about the routing process. The answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about advanced routing. Note that your box can only act as a router if you enable IP forwarding in your kernel; you can do that by saying Y to "/proc filesystem support" and "Sysctl support" below and executing the line echo "1" > /proc/sys/net/ipv4/ip_forward at boot time after the /proc filesystem has been mounted. If unsure, say N here. IP: policy routing CONFIG_IP_MULTIPLE_TABLES Normally, a router decides what to do with a received packet based solely on the packet's final destination address. If you say Y here, routing can also take into account the originating address and the network device from which the packet reached us. IP: equal cost multipath CONFIG_IP_ROUTE_MULTIPATH Normally, the routing tables specify a single action to be taken in a deterministic manner for a given packet. If you say Y here however, it becomes possible to attach several actions to a packet pattern, in effect specifying several alternative paths to travel for those packets. The router considers all these paths to be of equal "cost" and chooses one of them in a non-deterministic fashion if a matching packet arrives. IP: use TOS value as routing key CONFIG_IP_ROUTE_TOS The header of every IP packet carries a TOS (Type of Service) value with which the packet requests a certain treatment, e.g. low latency (for interactive traffic), high throughput, or high reliability. Normally, these values are ignored, but if you say Y here, you will be able to specify different routes for packets with different TOS values. IP: verbose route monitoring CONFIG_IP_ROUTE_VERBOSE If you say Y here, which is recommended, then the kernel will print verbose messages regarding the routing, for example warnings about received packets which look strange and could be evidence of an attack or a misconfigured system somewhere. The information is handled by the klogd daemon which is responsible for kernel messages ("man klogd"). IP: large routing tables CONFIG_IP_ROUTE_LARGE_TABLES If you have routing zones that grow to more than about 64 entries, you may want to say Y here to speed up the routing process. IP: fast network address translation CONFIG_IP_ROUTE_NAT If you say Y here, your router will be able to modify source and destination addresses of packets that pass through it. IP: optimize as router not host CONFIG_IP_ROUTER Some Linux network drivers use a technique called copy and checksum to optimize host performance. For a machine which acts as a router most of the time and is forwarding most packets to another host this is however a loss. If you say Y here, copy and checksum will be switched off. In the future, it may make other changes which optimize for router operation. Note that your box can only act as a router if you enable IP forwarding in your kernel; you can do that by saying Y to "/proc filesystem support" and "Sysctl support" below and executing the line echo "1" > /proc/sys/net/ipv4/ip_forward at boot time after the /proc filesystem has been mounted. If unsure, say N here. IP: firewalling CONFIG_IP_FIREWALL If you want to configure your Linux box as a packet filter firewall for a local TCP/IP based network, say Y here. This will enlarge your kernel by about 2kB. You may need to read the FIREWALL-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Also, you will need the ipfwadm tool (available via ftp (user: anonymous) from ftp://ftp.xos.nl/pub/linux/ipfwadm/) to allow selective blocking of Internet traffic based on type, origin and destination; this type of firewall is called a "packet filter". The other type of firewall, "proxy-based" ones, is more secure but more intrusive and more bothersome to set up; it inspects the network traffic much more closely, modifies it and has knowledge about the higher level protocols, which a packet filter lacks. Moreover, proxy-based firewalls often require changes to the programs running on the local clients. Proxy-based firewalls don't need support by the kernel, but they are often combined with a packet filter, which only works if you say Y here. The firewalling code will only work if IP forwarding is enabled in your kernel. You can do that by saying Y to "/proc filesystem support" and "Sysctl support" below and executing the line echo "1" > /proc/sys/net/ipv4/ip_forward at boot time after the /proc filesystem has been mounted. You need to say Y to "IP firewalling" in order to be able to use IP masquerading (masquerading means that local computers can chat with an outside host, but that outside host is made to think that it is talking to the firewall box -- makes the local network completely invisible to the outside world and avoids the need to allocate globally valid IP host addresses for the machines on the local net) and IP packet accounting (keeping track of what is using all your network bandwidth) and IP transparent proxying (makes the computers on the local network think they're talking to a remote computer, while in reality the traffic is redirected by your Linux firewall to a local proxy server). IP: firewall packet netlink device CONFIG_IP_FIREWALL_NETLINK If you say Y here and then packets hit your Linux firewall and are blocked, the first 128 bytes of each such packet are passed on to optional user space monitoring software that can then look for attacks and take actions such as paging the administrator of the site. To use this, you need to create a character special file under /dev with major number 36 and minor number 3 using mknod ("man mknod"), and you need (to write) a program that reads from that device and takes appropriate action. IP: accounting CONFIG_IP_ACCT This keeps track of your IP network traffic and produces some statistics. Usually, you only want to say Y here if your box will be a router or a firewall for some local network. For the latter, you need to say Y to "IP firewalling". The data is accessible with "cat /proc/net/ip_acct", so you want to say Y to the /proc filesystem below, if you say Y here. To specify what exactly should be recorded, you need the tool ipfwadm (available via ftp (user: anonymous) from ftp://ftp.xos.nl/pub/linux/ipfwadm/). IP: kernel level autoconfiguration CONFIG_IP_PNP This enables automatic configuration of IP addresses of devices and of the routing table during kernel boot, based on either information supplied at the kernel command line or by BOOTP or RARP protocols. You need to say Y only for diskless machines requiring network access to boot (in which case you want to say Y to "Root file system on NFS" as well), because all other machines configure the network in their startup scripts. BOOTP support CONFIG_IP_PNP_BOOTP If you want your Linux box to mount its whole root filesystem from some other computer over the net via NFS and you want the IP address of your computer to be discovered automatically at boot time using the BOOTP protocol (a special protocol designed for doing this job), say Y here. In case the boot ROM of your network card was designed for booting Linux and does BOOTP itself, providing all necessary information on the kernel command line, you can say N here. If unsure, say Y. Note that if you want to use BOOTP, a BOOTP server must be operating on your network. Read Documentation/nfsroot.txt for details. RARP support CONFIG_IP_PNP_RARP If you want your Linux box to mount its whole root filesystem from some other computer over the net via NFS and you want the IP address of your computer to be discovered automatically at boot time using the RARP protocol (an older protocol which is being obsoleted by BOOTP and DHCP), say Y here. Note that if you want to use RARP, a RARP server must be operating on your network. Read Documentation/nfsroot.txt for details. IP: tunneling CONFIG_NET_IPIP Tunneling means encapsulating data of one protocol type within another protocol and sending it over a channel that understands the encapsulating protocol. This particular tunneling driver implements encapsulation of IP within IP, which sounds kind of pointless, but can be useful if you want to make your (or some other) machine appear on a different network than it physically is, or to use mobile-IP facilities (allowing laptops to seamlessly move between networks without changing their IP addresses; check out http://anchor.cs.binghamton.edu/~mobileip/LJ/index.html). Saying Y to this option will produce two modules ( = code which can be inserted in and removed from the running kernel whenever you want), one encapsulator called tunnel.o and one decapsulator called ipip.o. You can read details in drivers/net/README.tunnel. Most people won't need this and can say N. IP: GRE tunnels over IP CONFIG_NET_IPGRE Tunneling means encapsulating data of one protocol type within another protocol and sending it over a channel that understands the encapsulating protocol. This particular tunneling driver implements GRE (Generic Routing Encapsulation) and at this time allows encapsulating of IPv4 or IPv6 over existing IPv4 infrastructure. This driver is useful if the other endpoint is a Cisco router: Cisco likes GRE much better than the other Linux tunneling driver ("IP: tunneling" above). In addition, GRE allows multicast redistribution through the tunnel. IP: broadcast GRE over IP CONFIG_NET_IPGRE_BROADCAST One application of GRE/IP is to construct a broadcast WAN (Wide Area Network), which looks like a normal Ethernet LAN (Local Area Network), but can be distributed all over the Internet. If you want to do that, say Y here and to "IP: multicast routing" below. IP: firewall packet logging CONFIG_IP_FIREWALL_VERBOSE This gives you information about what your firewall did with packets it received. The information is handled by the klogd daemon which is responsible for kernel messages ("man klogd"). IP: transparent proxying CONFIG_IP_TRANSPARENT_PROXY This enables your Linux firewall to transparently redirect any network traffic originating from the local network and destined for a remote host to a local server, called a "transparent proxy server". This makes the local computers think they are talking to the remote end, while in fact they are connected to the local proxy. Redirection is activated by defining special input firewall rules (using the ipfwadm utility) and/or by doing an appropriate bind() system call. IP: masquerading CONFIG_IP_MASQUERADE If one of the computers on your local network for which your Linux box acts as a firewall wants to send something to the outside, your box can "masquerade" as that computer, i.e. it forwards the traffic to the intended outside destination, but makes it look like it came from the firewall box itself. It works both ways: if the outside host replies, the Linux firewall will silently forward the traffic to the corresponding local computer. This way, the computers on your local net are completely invisible to the outside world, even though they can reach the outside and can be reached. This makes it possible to have the computers on the local network participate on the Internet even if they don't have officially registered IP addresses. (This last problem can also be solved by connecting the Linux box to the Internet using SLiRP [SLiRP is a SLIP/PPP emulator that works if you have a regular dial up shell account on some UNIX computer; get it via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/network/serial/ ].) The IP masquerading code will only work if IP forwarding is enabled in your kernel; you can do this by saying Y to "/proc filesystem support" and "Sysctl support" below and then executing a line like echo "1" > /proc/sys/net/ipv4/ip_forward from a boot time script after the /proc filesystem has been mounted. Details on how to set things up are contained in the IP Masquerade mini-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini. If you say Y here, you should also say Y to "IP: always defragment", below. If you say Y here, then the modules ip_masq_ftp.o (for ftp transfers through the firewall), ip_masq_irc.o (for irc chats through the firewall), and ip_masq_raudio.o (for realaudio downloads through the firewall) will automatically be compiled. Modules are pieces of code which can be inserted in and removed from the running kernel whenever you want; read Documentation/modules.txt for details. IP: ICMP masquerading CONFIG_IP_MASQUERADE_ICMP The basic masquerade code described for "IP: masquerading" above only handles TCP or UDP packets (and ICMP errors for existing connections). This option adds additional support for masquerading ICMP packets, such as ping or the probes used by the Windows 95 tracert program. If you want this, say Y. IP: ipautofw masquerade support (Experimental) CONFIG_IP_MASQUERADE_IPAUTOFW ipautofw is a program by Richard Lynch allowing additional support for masquerading protocols which do not (as yet) have their own protocol helpers. Information and source for ipautofw is available via ftp (user: anonymous) from ftp://ftp.netis.com/pub/members/rlynch/ The ipautofw code is still under development and so is currently marked EXPERIMENTAL. If you want to try it, say Y. This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ip_masq_autofw.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. IP: ipportfw masquerade support CONFIG_IP_MASQUERADE_IPPORTFW ipportfw is an addition to IP Masquerading written by Steven Clarke to allow some forwarding of packets from outside to inside a firewall on given ports. Information and source for ipportfw is available from http://www.monmouth.demon.co.uk/ipsubs/portforwarding.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). The portfw code is still under development and so is currently marked EXPERIMENTAL. If you want to try it, say Y. This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ip_masq_portfw.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. IP: always defragment CONFIG_IP_ALWAYS_DEFRAG This option means that all incoming fragments (= parts of IP packets that arose when some host between origin and destination decided that the IP packets were too large and cut them into pieces) will be reassembled (defragmented) before being processed, even if they are about to be forwarded. This option is highly recommended if you have said Y to "IP: masquerading" because that facility requires that second and further fragments can be related to TCP or UDP port numbers, which are only stored in the first fragment. When using "IP: firewalling" support , you might also want to say Y here, to have a more reliable firewall (otherwise second and further fragments will always be accepted by the firewall). When using "IP: transparent proxying", this option is implicit, although it is safe to say Y here. Do not say Y to this option except when running either a firewall that is the sole link to your network or a transparent proxy. Never ever say Y to this for a normal router or host. IP: aliasing support CONFIG_IP_ALIAS Sometimes it is useful to give several IP addresses to a single physical network interface (= serial port or Ethernet card). The most common case is that you want to serve different WWW or ftp documents to the outside according to which of your host names was used to connect to you. This is called "multihosting" or "virtual domains" or "virtual hosting services" and is explained in detail on the WWW at http://www.thesphere.com/~dlp/TwoServers/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and also in the Virtual-Hosting-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Another scenario would be that there are two logical networks living on your local Ethernet and you want to access them both with the same Ethernet card. This can be done if you say Y here. The configuration of these alias addresses is done with a special name syntax explained in Documentation/networking/alias.txt and in the IP-Alias mini-HOWTO. If you want this, say Y. Most people don't need it and say N. IP: multicast routing CONFIG_IP_MROUTE This is used if you want your machine to act as a router for IP packets that have several destination addresses. It is needed on the MBONE, a high bandwidth network on top of the Internet which carries audio and video broadcasts. In order to do that, you would most likely run the program mrouted. Information about the multicast capabilities of the various network cards is contained in Documentation/networking/multicast.txt. If you haven't heard about it, you don't need it. IP: PIM-SM version 1 support CONFIG_IP_PIMSM_V1 Kernel side support for Sparse Mode PIM (Protocol Independent Multicast) version 1. This multicast routing protocol is used widely because Cisco supports it. You need special software to use it (pimd-v1). Please see http://netweb.usc.edu/pim/ for more information about PIM (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Say Y if you want to use PIM-SM v1. Note that you can say N here if you just want to use Dense Mode PIM. IP: PIM-SM version 2 support CONFIG_IP_PIMSM_V2 Kernel side support for Sparse Mode PIM version 2. In order to use this, you need an experimental routing daemon supporting it (pimd or gated-5). This routing protocol is not used widely, so say N unless you want to play with it. PC/TCP compatibility mode CONFIG_INET_PCTCP If you have been having difficulties telneting to your Linux machine from a DOS system that uses (broken) PC/TCP networking software (all versions up to OnNet 2.0) over your local Ethernet try saying Y here. Everyone else says N. People having problems with NCSA telnet should see the file linux/Documentation/networking/ncsa-telnet. Reverse ARP server CONFIG_INET_RARP If there are (usually diskless or portable) machines on your local network that know their hardware Ethernet addresses but don't know their IP addresses upon startup, they can send out a Reverse Address Resolution Protocol (RARP) request to find out their own IP addresses. Diskless Sun 3 machines use this procedure at boot time, and diskless Linux boxes can be configured to do it as well. If you want your Linux box to be able to *answer* such requests, say Y here; you'll then have to run the program rarp ("man rarp") on your box. If you actually want to use a diskless Sun 3 machine as an Xterminal to Linux, say Y here and fetch Linux-Xkernel from ftp://sunsite.unc.edu/pub/Linux/system/network/boot.net/. Superior solutions to the problem of booting and configuring machines over a net connection are given by the protocol BOOTP and its successor DHCP. See the DHCP FAQ http://web.syr.edu/~jmwobus/comfaqs/dhcp.faq.html for details (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). If you want to compile RARP support as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called rarp.o. If you don't understand a word of the above, say N and rest in peace. Assume subnets are local CONFIG_INET_SNARL Say Y if you are on a subnetted network with all machines connected by Ethernet segments only, as this option optimizes network access for this special case. If there are other connections, e.g. SLIP links, between machines of your IP network, say N. If in doubt, say N. The PATH mtu discovery facility will cover most cases anyway. Path MTU Discovery (normally enabled) CONFIG_PATH_MTU_DISCOVERY MTU (maximal transfer unit) is the size of the chunks we send out over the net. "Path MTU Discovery" means that, instead of always sending very small chunks, we start out sending big ones and if we then discover that some host along the way likes its chunks smaller, we adjust to a smaller size. This is good, so most people say Y here. However, some DOS software (versions of DOS NCSA telnet and Trumpet Winsock in PPP mode) is broken and won't be able to connect to your Linux machine correctly in all cases (especially through a terminal server) unless you say N here. See Documentation/networking/ncsa-telnet for the location of fixed NCSA telnet clients. If in doubt, say Y. Disable NAGLE algorithm (normally enabled) CONFIG_TCP_NAGLE_OFF The NAGLE algorithm works by requiring an acknowledgment before sending small IP frames (= packets). This keeps tiny telnet and rlogin packets from congesting Wide Area Networks. Most people strongly recommend to say N here, thereby leaving NAGLE enabled. Those programs that would benefit from disabling this facility can do it on a per connection basis themselves. IP: Drop source routed frames CONFIG_IP_NOSR Usually, the originator of an IP frame (= packet) specifies only the destination, and the hosts along the way do the routing, i.e. they decide how to forward the frame. However, there is a feature of the IP protocol that allows to specify the full route for a given frame already at its origin. A frame with such a fully specified route is called "source routed". The question now is whether we should honour these route requests when such frames arrive, or if we should drop all those frames instead. Honouring them can introduce security problems (and is rarely a useful feature), and hence it is recommended that you say Y here unless you really know what you're doing. IP: Allow large windows (not recommended if <16Mb of memory) CONFIG_SKB_LARGE On high speed, long distance networks the performance limit on networking becomes the amount of data a machine can buffer until the other end confirms its reception. (At 45Mbit/second there are a lot of bits between New York and London ..). This option allows larger amounts of data to be "in flight" at a given time. It also means a user process can require a lot more memory for network buffers and thus this option is best only used on machines with 16Mb of memory or higher. Unless you are using long links with end to end speeds of over 2Mbit a second or satellite links this option will make no difference to performance. Unix domain sockets CONFIG_UNIX This includes Unix domain sockets, the standard Unix mechanism for establishing and accessing network connections. Unless you are working on an embedded system or something, you definitely want to say Y here. The socket support is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called unix.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If you try building this as a module and you are running kerneld, be sure to add 'alias net-pf-1 unix' to your /etc/conf.module file. If unsure, say Y. The IPv6 protocol CONFIG_IPV6 This is experimental support for the next version of the Internet Protocol: IP version 6 (also called IPng "IP next generation"). Features of this new protocol include: expanded address space, authentication and privacy, and seamless interoperability with the current version of IP (IP version 4). For general information about IPv6, see http://playground.sun.com/pub/ipng/html/ipng-main.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape); for specific information about IPv6 under Linux read the HOWTO at http://www.terra.net/ipv6/ and the file net/ipv6/README in the kernel source. If you want to use IPv6, please upgrade to the newest net-tools as given in Documentation/Changes. The IPv6 support is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ipv6.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. It's safe to say N for now. IPv6: enable EUI-64 token format CONFIG_IPV6_EUI64 6bone, the network of computers using the IPv6 protocol, is moving to a new aggregatable address format and a new link local address assignment (EUI-64). Say Y if your site has upgraded already, or has started to upgrade. IPv6: disable provider based addresses CONFIG_IPV6_NO_PB Linux tries to operate correctly when your site has moved to EUI-64 only partially. Unfortunately, the two address formats (old: "provider based" and new: "aggregatable") are incompatible. Say Y if your site finished the upgrade to EUI-64, and/or you encountered some problems caused by the presence of two link-local addresses on an interface. IPv6: routing messages via old netlink CONFIG_IPV6_NETLINK You can say Y here to receive routing messages from the IPv6 code through the old netlink interface. However, a better option is to say Y to "Kernel/User network link driver" and to "Routing messages" instead. The IPX protocol CONFIG_IPX This is support for the Novell networking protocol, IPX, commonly used for local networks of Windows machines. You need it if you want to access Novell NetWare file or print servers using the Linux Novell client ncpfs (available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/filesystems/) or from within the Linux DOS emulator dosemu (read the DOSEMU-HOWTO, available in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO). In order to do the former, you'll also have to say Y to "NCP filesystem support", below. IPX is similar in scope to IP, while SPX, which runs on top of IPX, is similar to TCP. There is also experimental support for SPX in Linux (see "SPX networking", below). To turn your Linux box into a fully featured NetWare file server and IPX router, say Y here and fetch either lwared from ftp://sunsite.unc.edu/pub/Linux/system/network/daemons/ or mars_nwe from ftp://ftp.gwdg.de/pub/linux/misc/ncpfs. For more information, read the IPX-HOWTO in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. General information about how to connect Linux, Windows machines and Macs is on the WWW at http://www.eats.com/linux_mac_win.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). The IPX driver would enlarge your kernel by about 5 kB. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ipx.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Unless you want to integrate your Linux box with a local Novell network, say N. IPX: Full internal IPX network CONFIG_IPX_INTERN Every IPX network has an address that identifies it. Sometimes it is useful to give an IPX "network" address to your Linux box as well (for example if your box is acting as a fileserver for different IPX networks: it will then be accessible from everywhere using the same address). The way this is done is to create a virtual internal "network" inside your box and to assign an IPX address to this network. Say Y here if you want to do this; read the IPX-HOWTO at sunsite.unc.edu:/pub/Linux/docs/howto for details. The full internal IPX network enables you to allocate sockets on different virtual nodes of the internal network. This is done by evaluating the field sipx_node of the socket address given to the bind call. So applications should always initialize the node field to 0 when binding a socket on the primary network. In this case the socket is assigned the default node that has been given to the kernel when the internal network was created. By enabling the full internal IPX network the cross-forwarding of packets targeted at 'special' sockets to sockets listening on the primary network is disabled. This might break existing applications, especially RIP/SAP daemons. A RIP/SAP daemon that works well with the full internal net can be found on ftp://ftp.gwdg.de/pub/linux/misc/ncpfs. If you don't know what you are doing, say N. IPX: SPX networking (EXPERIMENTAL) CONFIG_SPX The Sequenced Packet eXchange protocol is a transport layer protocol built on top of IPX. It is used in Novell NetWare systems for client-server applications and is similar to TCP (which runs on top of IP). Note that Novell NetWare file sharing does not use SPX; it uses a protocol called NCP, for which separate Linux support is available ("NCP filesystem support" below for the client side, and the user space programs lwared or mars_nwe for the server side). Say Y here if you have use for SPX; read the IPX-HOWTO at sunsite.unc.edu:/pub/Linux/docs/howto for details. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called af_spx.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Appletalk DDP CONFIG_ATALK Appletalk is the way Apple computers speak to each other on a network. If your Linux box is connected to such a network and you want to join the conversation, say Y. You will need to use the netatalk package so that your Linux box can act as a print and file server for macs as well as access appletalk printers. Check out http://threepio.hitchcock.org/cgi-bin/faq/netatalk/faq.pl on the WWW for details (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). EtherTalk is the name used for appletalk over Ethernet and the cheaper and slower LocalTalk is appletalk over a proprietary apple network using serial links. Ethertalk and Localtalk are fully supported by Linux. The NET-2-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO contains valuable information as well. General information about how to connect Linux, Windows machines and Macs is on the WWW at http://www.eats.com/linux_mac_win.html This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called appletalk.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. I hear that the GNU boycott of Apple is over, so even politically correct people are allowed to say Y here. Appletalk-IP driver support CONFIG_IPDDP This allows IP networking for users who only have Appletalk networking available. This feature is experimental. With this driver, you can either encapsulate IP inside Appletalk (e.g. if your Linux box is stuck on an Appletalk only network) or decapsulate (e.g. if you want your Linux box to act as an Internet gateway for a zoo of appletalk connected Macs). You decide which one of the two you want in the following two questions; you can say Y to only one of them. Please see Documentation/networking/ipddp.txt for more information. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called ipddp.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. IP to Appletalk-IP Encapsulation support CONFIG_IPDDP_ENCAP If you say Y here, the kernel will be able to encapsulate IP packets inside Appletalk frames; this is useful if your Linux box is stuck on an appletalk network (which hopefully contains a decapsulator somewhere). Please see Documentation/networking/ipddp.txt for more information. If you say Y here, you cannot say Y to "Appletalk-IP to IP Decapsulation support", below. Appletalk-IP to IP Decapsulation support CONFIG_IPDDP_DECAP If you say Y here, the kernel will be able to decapsulate Appletalk-IP frames to IP packets; this is useful if you want your Linux box to act as an Internet gateway for an appletalk network. Please see Documentation/networking/ipddp.txt for more information. If you say Y here, you cannot say Y to "IP to Appletalk-IP Encapsulation support", above. Apple/Farallon LocalTalk PC card support CONFIG_LTPC This allows you to use the AppleTalk PC card to connect to LocalTalk networks. The card is also known as the Farallon PhoneNet PC card. If you are in doubt, this card is the one with the 65C02 chip on it. You also need version 1.3.3 or later of the netatalk package. This driver is experimental, which means that it may not work. See the file Documentation/networking/ltpc.txt. COPS LocalTalk PC card support CONFIG_COPS This allows you to use COPS AppleTalk cards to connect to LocalTalk networks. You also need version 1.3.3 or later of the netatalk package. This driver is experimental, which means that it may not work. This driver will only work if you choose "Appletalk DDP" networking support, above. Please read the file Documentation/networking/cops.txt. Dayna firmware support CONFIG_COPS_DAYNA Support COPS compatible cards with Dayna style firmware (Dayna DL2000/ Daynatalk/PC (half length), COPS LT-95, Farallon PhoneNET PC III, Farallon PhoneNET PC II). Tangent firmware support CONFIG_COPS_TANGENT Support COPS compatible cards with Tangent style firmware (Tangent ATB_II, Novell NL-1000, Daystar Digital LT-200. Amateur Radio support CONFIG_HAMRADIO If you want to connect your Linux computer to an amateur radio, say Y here. You want to read http://www.tapr.org/tapr/html/pkthome.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and the HAM-HOWTO and the AX25-HOWTO, both available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about amateur radio. Amateur Radio AX.25 Level 2 CONFIG_AX25 This is the protocol used for computer communication over amateur radio. It is either used by itself for point-to-point links, or to carry other protocols such as tcp/ip. To use it, you need a device that connects your Linux box to your amateur radio. You can either use a low speed TNC (a Terminal Node Controller acts as a kind of modem connecting your computer's serial port to your radio's microphone input and speaker output) supporting the KISS protocol or one of the various SCC cards that are supported by the Ottawa PI, the Gracilis Packetwin or the generic Z8530 driver. Another option are the Baycom modem serial and parallel port hacks or the sound card modem (supported by their own drivers). If you say Y here, you also have to say Y to one of those drivers. Information about where to get supporting software for Linux amateur radio as well as information about how to configure an AX.25 port is contained in the AX25-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. You might also want to check out the file Documentation/networking/ax25.txt in the kernel source. More information about digital amateur radio in general is on the WWW at http://www.tapr.org/tapr/html/pkthome.html. (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ax25.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. AX.25 DAMA Slave support CONFIG_AX25_DAMA_SLAVE DAMA is a mechanism to prevent collisions when doing AX.25 networking. A DAMA server (called "master") accepts incoming traffic from clients (called "slaves") and redistributes it to other slaves. If you say Y here, your Linux box will act as a DAMA slave; this is transparent in that you don't have to do any special DAMA configuration. (Linux cannot yet act as a DAMA server.) If unsure, say N. AX.25 DAMA Master support CONFIG_AX25_DAMA_MASTER DAMA is a mechanism to prevent collisions when doing AX.25 networking. A DAMA server (called "master") accepts incoming traffic from clients (called "slaves") and redistributes it to other slaves. If you say Y here, your Linux box will act as a DAMA server. If unsure, say N. Amateur Radio NET/ROM CONFIG_NETROM NET/ROM is a network layer protocol on top of AX.25 useful for routing. A comprehensive listing of all the software for Linux amateur radio users as well as information about how to configure an AX.25 port is contained in the AX25-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. You also might want to check out the file Documentation/networking/ax25.txt. More information about digital amateur radio in general is on the WWW at http://www.tapr.org/tapr/html/pkthome.html (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called netrom.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Amateur Radio X.25 PLP (Rose) CONFIG_ROSE The Packet Layer Protocol (PLP) is a way to route packets over X.25 connections in general and amateur radio AX.25 connections in particular, essentially an alternative to NET/ROM. A comprehensive listing of all the software for Linux amateur radio users as well as information about how to configure an AX.25 port is contained in the AX25-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. You also might want to check out the file Documentation/networking/ax25.txt. More information about digital amateur radio in general is on the WWW at http://www.tapr.org/tapr/html/pkthome.html (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called rose.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Serial port KISS driver for AX.25 CONFIG_MKISS KISS is a protocol used to send IP traffic over AX.25 radio connections, somewhat similar to SLIP for telephone lines. Say Y here if you intend to send Internet traffic over amateur radio, using some device connected to your machine's serial port. In that case, you also have to say Y to "Amateur Radio AX.25 Level 2" support. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called mkiss.o. Serial port 6PACK driver for AX.25 CONFIG_6PACK 6pack is a transmission protocol for the data exchange between your PC and your TNC (the Terminal Node Controller acts as a kind of modem connecting your computer's serial port to your radio's microphone input and speaker output). This protocol can be used as an alternative to KISS for networking over AX.25 amateur radio connections, but it has some extended functionality. Note that this driver is still experimental and might cause problems. For details about the features and the usage of the driver, read Documentation/networking/6pack.txt. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called 6pack.o. BPQ Ethernet driver CONFIG_BPQETHER AX.25 is the protocol used for computer communication over amateur radio. If you say Y here, you will be able to send and receive AX.25 traffic over Ethernet (also called "BPQ AX.25"), which could be useful if some other computer on your local network has a direct amateur radio connection. High-speed (DMA) SCC driver for AX.25 CONFIG_DMASCC This is a driver for high-speed SCC boards (used to connect your computer to your amateur radio and send Internet traffic over the radio), i.e. those supporting DMA on one port. Currently, only Ottawa PI/PI2 boards (see http://hydra.carleton.ca/info/pi2.html) and Gracilis PackeTwin boards (see http://www.paccomm.com/; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) are supported and detected automatically. If you have one of these cards, you can say Y here and should read the HAM-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver operates multiple boards simultaneously. If you compile this driver as a module, it will be called dmascc.o. If you don't give any parameter to the driver, all possible I/O addresses are probed. This could irritate other devices that are currently not in use. You may specify the list of addresses to be probed by "dmascc=addr1,addr2,..." (when compiled into the kernel image) or "io=addr1,addr2,..." (when loaded as a module). The network interfaces will be called dmascc0 and dmascc1 for the board detected first, dmascc2 and dmascc3 for the second one, and so on. Before you configure each interface with ifconfig, you MUST set certain parameters, such as channel access timing, clock mode, and DMA channel. This is accomplished with a small utility program called dmascc_cfg, which is part of the ax25-utils package. Alternatively, you may download the utility from http://www.oevsv.at/~oe1kib/Linux.html. Z8530 SCC driver for AX.25 CONFIG_SCC These cards are used to connect your Linux box to an amateur radio in order to communicate with other computers. If you want to use this, read Documentation/networking/z8530drv.txt and the AX.25-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Also make sure to say Y to "Amateur Radio AX.25 Level 2" support. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called scc.o. additional delay for PA0HZP OptoSCC compatible boards CONFIG_SCC_DELAY Say Y here if you experience problems with the SCC driver not working properly; please read Documentation/networking/z8530drv.txt for details. If unsure, say N. #support for TRX that feedback the tx signal to rx #CONFIG_SCC_TRXECHO ### ### Don't know what's going on here. ### # BAYCOM picpar and par96 driver for AX.25 CONFIG_BAYCOM_PAR This is a driver for Baycom style simple amateur radio modems that connect to a parallel interface. The driver supports the picpar and par96 designs. To configure the driver, use the sethdlc utility available in the standard ax25 utilities package. For information on the modems, see http://www.baycom.de (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and Documentation/networking/baycom.txt. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. This is recommended. The module will be called baycom_par.o. BAYCOM ser12 full duplex driver for AX.25 CONFIG_BAYCOM_SER_FDX This is one of two drivers for Baycom style simple amateur radio modems that connect to a serial interface. The driver supports the ser12 design in full duplex mode. In addition, it allows the baudrate to be set between 300 and 4800 baud (however not all modems support all baudrates). This is the preferred driver. The next driver, "BAYCOM ser12 half duplex driver for AX.25" is the old driver and still provided in case this driver does not work with your serial interface chip. To configure the driver, use the sethdlc utility available in the standard ax25 utilities package. For information on the modems, see http://www.baycom.de (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and Documentation/networking/baycom.txt. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. This is recommended. The module will be called baycom_ser_fdx.o. BAYCOM ser12 half duplex driver for AX.25 CONFIG_BAYCOM_SER_HDX This is one of two drivers for Baycom style simple amateur radio modems that connect to a serial interface. The driver supports the ser12 design in full duplex mode. This is the old driver. It is still provided in case your serial interface chip does not work with the full duplex driver. This driver is depreciated. To configure the driver, use the sethdlc utility available in the standard ax25 utilities package. For information on the modems, see http://www.baycom.de (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and Documentation/networking/baycom.txt. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. This is recommended. The module will be called baycom_ser_hdx.o. Sound card modem driver for AX.25 CONFIG_SOUNDMODEM This experimental driver allows a standard SoundBlaster or WindowsSoundSystem compatible sound card to be used as a packet radio modem (NOT as a telephone modem!), to send digital traffic over amateur radio. To configure the driver, use the sethdlc, smdiag and smmixer utilities available in the standard ax25 utilities package. For information on how to key the transmitter, see http://www.ife.ee.ethz.ch/~sailer/pcf/ptt_circ/ptt.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and Documentation/networking/soundmodem.txt. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. This is recommended. The module will be called soundmodem.o. Sound card modem support for SoundBlaster and compatible cards CONFIG_SOUNDMODEM_SBC This option enables the soundmodem driver to use SoundBlaster and compatible cards. If you have a dual mode card (i.e. a WSS cards with a SoundBlaster emulation) you should say N here and Y to "Sound card modem support for WSS and Crystal cards", below, because this usually results in better performance. This option also supports SB16/32/64 in full duplex mode. Sound card modem support for WSS and Crystal cards CONFIG_SOUNDMODEM_WSS This option enables the soundmodem driver to use WindowsSoundSystem compatible cards. These cards feature a codec chip from either Analog Devices (such as AD1848, AD1845, AD1812) or Crystal Semiconductors (such as CS4248, CS423x). This option also supports the WSS full duplex operation which currently works with Crystal CS423x chips. If you don't need full duplex operation, do not enable it to save performance. Sound card modem support for 1200 baud AFSK modulation CONFIG_SOUNDMODEM_AFSK1200 This option enables the soundmodem driver 1200 baud AFSK modem, compatible to popular modems using TCM3105 or AM7911. The demodulator requires about 12% of the CPU power of a Pentium 75 CPU per channel. Sound card modem support for 2400 baud AFSK modulation (7.3728MHz crystal) CONFIG_SOUNDMODEM_AFSK2400_7 This option enables the soundmodem driver 2400 baud AFSK modem, compatible to TCM3105 modems (over-)clocked with a 7.3728MHz crystal. Note that the availability of this driver does _not_ imply that I recommend building such links. It is only here since users especially in eastern Europe have asked me to do so. In fact this modulation scheme has many disadvantages, mainly its incompatibility with many transceiver designs and the fact that the TCM3105 (if used) is operated widely outside its specifications. Sound card modem support for 2400 baud AFSK modulation (8MHz crystal) CONFIG_SOUNDMODEM_AFSK2400_8 This option enables the soundmodem driver 2400 baud AFSK modem, compatible to TCM3105 modems (over-)clocked with an 8MHz crystal. Note that the availability of this driver does _not_ imply that I recommend building such links. It is only here since users especially in eastern Europe have asked me to do so. In fact this modulation scheme has many disadvantages, mainly its incompatibility with many transceiver designs and the fact that the TCM3105 (if used) is operated widely outside its specifications. Sound card modem support for 2666 baud AFSK modulation CONFIG_SOUNDMODEM_AFSK2666 This option enables the soundmodem driver 2666 baud AFSK modem. This modem is experimental, and not compatible to anything else I know of. Sound card modem support for 4800 baud 8PSK modulation CONFIG_SOUNDMODEM_PSK4800 This option enables the soundmodem driver 4800 baud 8PSK modem. This modem is experimental, and not compatible to anything else I know of. Sound card modem support for 4800 baud HAPN-1 modulation CONFIG_SOUNDMODEM_HAPN4800 This option enables the soundmodem driver 4800 baud HAPN-1 compatible modem. This modulation seems to be widely used 'down under' and in the Netherlands. Here, nobody uses it, so I could not test if it works. It is compatible to itself, however :-) Sound card modem support for 9600 baud FSK G3RUH modulation CONFIG_SOUNDMODEM_FSK9600 This option enables the soundmodem driver 9600 baud FSK modem, compatible to the G3RUH standard. The demodulator requires about 4% of the CPU power of a Pentium 75 CPU per channel. You can say Y to both 1200 baud AFSK and 9600 baud FSK if you want (but obviously you can only use one protocol at a time, depending on what the other end can understand). CCITT X.25 Packet Layer CONFIG_X25 X.25 is a set of standardized network protocols, similar in scope to frame relay; the one physical line from your box to the X.25 network entry point can carry several logical point-to-point connections (called "virtual circuits") to other computers connected to the X.25 network. Governments, banks, and other organizations tend to use it to connect to each other or to form Wide Area Networks (WAN's). Many countries have public X.25 networks. X.25 consists of two protocols: the higher level Packet Layer Protocol (PLP) (say Y here if you want that) and the lower level data link layer protocol LAPB (say Y to "LAPB Data Link Driver" below if you want that). You can read more about X.25 at http://www.sangoma.com/x25.html and http://www.cisco.com/univercd/data/doc/software/11_0/rpcg/cx25.htm (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Information about X.25 for Linux is contained in the files Documentation/networking/x25.txt and Documentation/networking/x25-iface.txt. One connects to an X.25 network either with a dedicated network card using the X.21 protocol (not yet supported by Linux) or one can do X.25 over a standard telephone line using an ordinary modem (say Y to "X.25 async driver" below) or over Ethernet using an ordinary Ethernet card and either the 802.2 LLC protocol (say Y to "802.2 LLC" below) or LAPB over Ethernet (say Y to "LAPB Data Link Driver" and "LAPB over Ethernet driver" below). If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called x25.o. If unsure, say N. LAPB Data Link Driver (EXPERIMENTAL) CONFIG_LAPB Link Access Procedure, Balanced (LAPB) is the data link layer (i.e. the lower) part of the X.25 protocol. It offers a reliable connection service to exchange data frames with one other host, and it is used to transport higher level protocols (mostly X.25 Packet Layer, the higher part of X.25, but others are possible as well). Usually, LAPB is used with specialized X.21 network cards, but Linux currently supports LAPB only over Ethernet connections. If you want to use LAPB connections over Ethernet, say Y here and to "LAPB over Ethernet driver" below. Read Documentation/networking/lapb-module.txt for technical details. If you want to compile this driver as a module though ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called lapb.o. If unsure, say N. 802.2 LLC (VERY EXPERIMENTAL) CONFIG_LLC This is a Logical Link Layer protocol used for X.25 connections over Ethernet, using ordinary Ethernet cards. Bridging (EXPERIMENTAL) CONFIG_BRIDGE If you say Y here, then your Linux box will be able to act as an Ethernet bridge, which means that the different Ethernet segments it is connected to will appear as one Ethernet to the participants. Several such bridges can work together to create even larger networks of Ethernets using the IEEE802.1 spanning tree algorithm. As this is a standard, Linux bridges will interwork properly with other third party bridge products. In order to use this, you'll need the bridge configuration tools available via ftp (user: anonymous) from ftp://shadow.cabi.net/pub/Linux. Please read the Bridge mini-HOWTO for more information. Note that if your box acts as a bridge, it probably contains several Ethernet devices, but the kernel is not able to recognize more than one at boot time without help; for details read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. The Bridging code is still in test. If unsure, say N. Packet socket CONFIG_PACKET The Packet protocol is used by applications which communicate directly with network devices without an intermediate network protocol implemented in the kernel, e.g. tcpdump. If you want them to work, choose Y. This driver is also available as a module called af_packet.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say Y. Kernel/User network link driver CONFIG_NETLINK This driver allows for two-way communication between certain parts of the kernel or modules and user processes; the user processes are able to read from and write to character special files in the /dev directory having major mode 36. So far, the kernel uses it to publish some network related information if you say Y to "Routing messages", below. It is also used by the firewall code to publish information about possible attacks if you say Y to "IP: firewall packet netlink device" further down. You also need to say Y here if you want to use arpd, a daemon that helps keep the internal ARP cache (a mapping between IP addresses and hardware addresses on the local network) small. The ethertap device, which lets user space programs read and write raw Ethernet frames, also needs the network link driver. If unsure, say Y. Routing messages CONFIG_RTNETLINK If you say Y here and create a character special file /dev/route with major number 36 and minor number 0 using mknod ("man mknod"), you (or some user space utility) can read some network related routing information from that file. Everything you write to that file will be discarded. Netlink device emulation CONFIG_NETLINK_DEV This is a backward compatibility option, choose Y for now. This option will be removed soon. SCSI support? CONFIG_SCSI If you want to use a SCSI hard disk, SCSI tape drive, SCSI CDROM or any other SCSI device under Linux, say Y and make sure that you know the name of your SCSI host adapter (the card inside your computer that "speaks" the SCSI protocol), because you will be asked for it. You also need to say Y here if you want support for the parallel port version of the 100MB IOMEGA ZIP drive. Please read the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called scsi_mod.o. If you want to compile it as a module, say M here and read Documentation/modules.txt and Documentation/scsi.txt. However, do not compile this as a module if your root filesystem (the one containing the directory /) is located on a SCSI device. SCSI disk support CONFIG_BLK_DEV_SD If you want to use a SCSI hard disk or the SCSI or parallel port version of the IOMEGA ZIP drive under Linux, say Y and read the SCSI-HOWTO and the Disk-HOWTO, both available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This is NOT for SCSI CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sd_mod.o. If you want to compile it as a module, say M here and read Documentation/modules.txt and Documentation/scsi.txt. Do not compile this driver as a module if your root filesystem (the one containing the directory /) is located on a SCSI disk. In this case, do not compile the driver for your SCSI host adapter (below) as a module either. SCSI tape support CONFIG_CHR_DEV_ST If you want to use a SCSI tapedrive under Linux, say Y and read the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO and drivers/scsi/README.st in the kernel source. This is NOT for SCSI CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called st.o. If you want to compile it as a module, say M here and read Documentation/modules.txt and Documentation/scsi.txt . SCSI CDROM support CONFIG_BLK_DEV_SR If you want to use a SCSI CDROM under Linux, say Y and read the SCSI-HOWTO and the CDROM-HOWTO from sunsite.unc.edu:/pub/Linux/docs/HOWTO. Also make sure to say Y to "ISO9660 cdrom filesystem support" later. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sr_mod.o. If you want to compile it as a module, say M here and read Documentation/modules.txt and Documentation/scsi.txt . Enable vendor-specific extensions (for SCSI CDROM) CONFIG_BLK_DEV_SR_VENDOR This enables the usage of vendor specific SCSI commands. This is required to support multisession CD's with old NEC/TOSHIBA cdrom drives (and HP Writers). If you have such a drive and get the first session only, try saying Y here; everybody else says N. SCSI generic support CONFIG_CHR_DEV_SG If you want to use SCSI scanners, synthesizers or CD-writers or just about anything having "SCSI" in its name other than hard disks, CDROMs or tapes, say Y here. These won't be supported by the kernel directly, so you need some additional software which knows how to talk to these devices using the SCSI protocol. For CD-writers, you would need the program cdwrite, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/utils/disk-management; for other devices, it's possible that you'll have to write the driver software yourself, so have a look at the SCSI-HOWTO and at the SCSI-Programming-HOWTO, both available via ftp (user: anonymous) in sunsite.unc.edu:/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt and Documentation/scsi.txt. The module will be called sg.o. If unsure, say N. Probe all LUNs on each SCSI device CONFIG_SCSI_MULTI_LUN If you have a SCSI device that supports more than one LUN (Logical Unit Number), e.g. a CD jukebox, and only one LUN is detected, you can say Y here to force the SCSI driver to probe for multiple LUNs. A SCSI device with multiple LUNs acts logically like multiple SCSI devices. The vast majority of SCSI devices have only one LUN, and so most people can say N here and should in fact do so, because it is safer. Verbose SCSI error reporting (kernel size +=12K) CONFIG_SCSI_CONSTANTS The error messages regarding your SCSI hardware will be easier to understand if you say Y here; it will enlarge your kernel by about 12KB. If in doubt, say Y. SCSI logging facility CONFIG_SCSI_LOGGING This turns on a logging facility that can be used to debug a number of problems. Normally no logging output will appear, but you can enable logging with a shell command like: echo "scsi log token [level]" > /proc/scsi/scsi There are a number of things that can be used for 'token' (you can find them in the source: drivers/scsi/scsi.c), and this allows you to select the types of information you want, and the level allows you to select the level of verbosity. If you say N here, it may be harder to track down some types of SCSI problems. If you say Y here your kernel will be somewhat larger, but there should be no noticeable performance impact as long as you have logging turned off. AdvanSys SCSI support CONFIG_SCSI_ADVANSYS This is a driver for all SCSI host adapters manufactured by AdvanSys. It is documented in the kernel source in drivers/scsi/advansys.c. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. The module will be called advansys.o. Adaptec AHA152X/2825 support CONFIG_SCSI_AHA152X This is support for the AHA-1510, AHA-1520, AHA-1522, and AHA-2825 SCSI host adapters. It is explained in section 3.3 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. You might also want to read the comments at the top of drivers/scsi/aha152x.c. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called aha152x.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Adaptec AHA1542 support CONFIG_SCSI_AHA1542 This is support for a SCSI host adapter. It is explained in section 3.4 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that Trantor was recently purchased by Adaptec, and some former Trantor products are being sold under the Adaptec name. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/aha1542.h. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called aha1542.o. Adaptec AHA1740 support CONFIG_SCSI_AHA1740 This is support for a SCSI host adapter. It is explained in section 3.5 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/aha1740.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called aha17400.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Adaptec AIC7xxx chipset SCSI controller support CONFIG_SCSI_AIC7XXX This is support for the various aic7xxx based Adaptec SCSI controllers. These include the 274x EISA cards, 284x VLB cards, 294x PCI cards, 394x PCI cards, 3985 PCI card, and several versions of the Adaptec built-in SCSI controllers on various PC motherboards. Information on the configuration options for this controller can be found by checking the help file for each of the available configuration options. You also want to read drivers/scsi/README.aic7xxx and the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the AHA2920 SCSI host adapter is *not* supported by this driver; choose "Future Domain 16xx SCSI support" instead if you have one of those. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called aic7xxx.o. Override driver defaults for commands per LUN CONFIG_OVERRIDE_CMDS Say Y here if you want to override the default maximum number of commands that a single device on the aic7xxx controller is allowed to have active at one time. This option only effects tagged queueing capable devices. The driver uses a "failsafe" value of 8 by default. This is much lower than many devices can handle, but left in place for safety's sake. If you say Y here, you can adjust the number of commands per LUN with the following configuration option. NOTE: This does not actually enable tagged queueing on any particular device. The driver has changed in this respect. Please see the file drivers/scsi/README.aic7xxx for more information on how to get particular devices to use tagged command queueing. If unsure, say N. Maximum number of commands per LUN CONFIG_AIC7XXX_CMDS_PER_LUN Specify the maximum number of commands you would like to allocate per LUN (a LUN is a Logical Unit Number - some physical SCSI devices, e.g. CD jukeboxes, act logically as several separate units, each of which gets its own number). Reasonable figures are in the range of 14 to 32 commands per device, but depending on hardware could be increased or decreased from that figure. If the number is too high for any particular device, the driver will automatically compensate usually after only 10 minutes of uptime and will issue a message to alert you to the fact that the number of commands for that device has been reduced. It will not hinder performance if some of your devices eventually have their commands per LUN reduced, but is a waste of memory if all of your devices end up reducing this number down to a more reasonable figure. Default: 24 Collect statistics to report in /proc CONFIG_AIC7XXX_PROC_STATS This option tells the driver to keep track of how many commands have been sent to each particular device and report that information to the user via the /proc/scsi/aic7xxx/n file, where n is the number of the aic7xxx controller you want the information on. This adds a small amount of overhead to each and every SCSI command the aic7xxx driver handles, so if you aren't really interested in this information, it is best to leave it disabled. This will only work if you also say Y to "/proc filesystem support", below. If unsure, say N. Delay in seconds after SCSI bus reset CONFIG_AIC7XXX_RESET_DELAY This sets how long the driver will wait after resetting the SCSI bus before attempting to communicate with the devices on the SCSI bus again. This delay will be used during the reset phase at bootup time as well as after any reset that might occur during normal operation. Reasonable numbers range anywhere from 5 to 15 seconds depending on your devices. DAT tape drives are notorious for needing more time after a bus reset to be ready for the next command, but most hard drives and CD-ROM devices are ready in only a few seconds. This option has a maximum upper limit of 20 seconds to avoid bad interactions between the aic7xxx driver and the rest of the linux kernel. The default value has been reduced to 5 seconds. If this doesn't work with your hardware, try increasing this value. BusLogic SCSI support CONFIG_SCSI_BUSLOGIC This is support for BusLogic MultiMaster and FlashPoint SCSI Host Adapters. Consult the SCSI-HOWTO, available via anonymous ftp from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO, and the files README.BusLogic and README.FlashPoint in drivers/scsi for more information. If this driver does not work correctly without modification, please contact the author, Leonard N. Zubkoff, by email to lnz@dandelion.com. You can also build this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), but only a single instance may be loaded. If you want to compile it as a module, say M here and read Documentation/modules.txt. The module will be called BusLogic.o. Omit BusLogic SCSI FlashPoint support CONFIG_SCSI_OMIT_FLASHPOINT This option allows you to omit the FlashPoint support from the BusLogic SCSI driver. The FlashPoint SCCB Manager code is substantial, so users of MultiMaster Host Adapters may wish to omit it. DTC3180/3280 SCSI support CONFIG_SCSI_DTC3280 This is support for DTC 3180/3280 SCSI Host Adapters. Please read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO and the file drivers/scsi/README.dtc3x80. This driver is also available as a module (= code which can be inserted in and removed from the running kernel whenever you want). The module will be called dtc.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. EATA-DMA (DPT, NEC, AT&T, SNI, AST, Olivetti, Alphatronix) support CONFIG_SCSI_EATA_DMA This is support for the EATA-DMA protocol compliant SCSI Host Adapters like the SmartCache III/IV, SmartRAID controller families and the DPT PM2011B and PM2012B controllers. Note that there is also another driver for the same hardware: "EATA ISA/EISA/PCI support". You should only say Y to one of them. Please read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module (= code which can be inserted in and removed from the running kernel whenever you want). The module will be called eata_dma.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. EATA-PIO (old DPT PM2001, PM2012A) support CONFIG_SCSI_EATA_PIO This driver supports all EATA-PIO protocol compliant SCSI Host Adapters like the DPT PM2001 and the PM2012A. EATA-DMA compliant host adapters could also use this driver but are discouraged from doing so, since this driver only supports hard disks and lacks numerous features. You might want to have a look at the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called eata_pio.o. UltraStor 14F/34F support CONFIG_SCSI_U14_34F This is support for the UltraStor 14F and 34F SCSI-2 host adapters. The source at drivers/scsi/u14-34f.c contains some information about this hardware. If the driver doesn't work out of the box, you may have to change some settings in drivers/scsi/u14-34f.c. Read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that there is also another driver for the same hardware: "UltraStor SCSI support", below. You should say Y to both only if you want 24F support as well. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called u14-34f.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. enable elevator sorting CONFIG_SCSI_U14_34F_LINKED_COMMANDS This is a feature of SCSI-2 which improves performance: the host adapter can send a whole list of commands to a device in one batch. Some SCSI devices might not implement this properly, so the safe answer is N. maximum number of queued commands CONFIG_SCSI_U14_34F_MAX_TAGS This specifies how many SCSI commands can be maximally queued for a given SCSI device. Go with the default unless you know what you're doing. Minimum is 2 and maximum is 8. Future Domain 16xx SCSI/AHA 2920 support CONFIG_SCSI_FUTURE_DOMAIN This is support for Future Domain's 16-bit SCSI host adapters (TMC-1660/1680, TMC-1650/1670, TMC-3260, TMC-1610M/MER/MEX) and other adapters based on the Future Domain chipsets (Quantum ISA-200S, ISA-250MG; Adaptec AHA-2920; and at least one IBM board). It is explained in section 3.7 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called fdomain.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Generic NCR5380/53c400 SCSI support CONFIG_SCSI_GENERIC_NCR5380 This is the generic NCR family of SCSI controllers, not to be confused with the NCR 53c7 or 8xx controllers. It is explained in section 3.8 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/g_NCR5380.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called g_NCR5380.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Enable NCR53c400 extensions CONFIG_SCSI_GENERIC_NCR53C400 This enables certain optimizations for the NCR53c400 SCSI cards. You might as well try it out. Note that this driver will only probe for the Trantor T130B in its default configuration; you might have to pass a command line option to the kernel at boot time if it doesn't detect your card. See the file drivers/scsi/README.g_NCR5380 for details. NCR5380/53c400 mapping method (use Port for T130B) CONFIG_SCSI_G_NCR5380_PORT The NCR5380 and NCR53c400 SCSI controllers come in two varieties: port or memory mapped. You should know what you have. The most common card, Trantor T130B, uses port mapped mode. NCR53c7,8xx SCSI support CONFIG_SCSI_NCR53C7xx This is the 53c7 and 8xx NCR family of SCSI controllers, not to be confused with the NCR 5380 controllers. It is explained in section 3.8 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/53c7,8xx.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called 53c7,8xx.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. always negotiate synchronous transfers CONFIG_SCSI_NCR53C7xx_sync In general, this is good; however, it is a bit dangerous since there are some broken SCSI devices out there. Take your chances. Safe bet is N. allow FAST-SCSI [10MHz] CONFIG_SCSI_NCR53C7xx_FAST This will enable 10MHz FAST-SCSI transfers with your host adapter. Some systems have problems with that speed, so it's safest to say N here. allow DISCONNECT CONFIG_SCSI_NCR53C7xx_DISCONNECT This enables the disconnect/reconnect feature of the NCR SCSI controller. When you say Y here, a slow SCSI device will not lock the SCSI bus while processing a request, allowing simultaneous use of e.g. a SCSI hard disk and SCSI tape or CD-ROM drive, and providing much better performance when using slow and fast SCSI devices at the same time. Some devices, however, do not operate properly with this option enabled, and will cause your SCSI system to hang, which might cause a system crash. The safe answer therefore is to say N. NCR53C8XX SCSI support CONFIG_SCSI_NCR53C8XX This is the BSD ncr driver adapted to Linux for the NCR53C8XX family of PCI-SCSI controllers. This driver supports parity checking, tagged command queuing, Fast-20 data transfer up to 20 MB/s with narrow SCSI devices and 40 MB/s with wide SCSI devices. Please read drivers/scsi/README.ncr53c8xx for more information. Linux/i386, Linux/Alpha and Linux/PPC are supported by this driver. synchronous data transfers frequency CONFIG_SCSI_NCR53C8XX_SYNC SCSI-2 specifications allow SCSI devices to negotiate a synchronous transfer period of 25 nano-seconds or more. The transfer period value is 4 times the agreed transfer period. So, data can be transferred at a 10 MHz frequency, allowing 10 MB/second throughput with 8 bits SCSI-2 devices and 20 MB/second with wide16 devices. This frequency can be used safely with differential devices but may cause problems with single-ended devices. Specify 0 if you want to only use asynchronous data transfers. Otherwise, specify a value between 5 and 10. Commercial O/Ses generally use 5 Mhz frequency for synchronous transfers. It is a reasonable default value. However, a flawless single-ended SCSI bus supports 10 MHz data transfers. Regardless of the value chosen in the Linux configuration, the synchronous period can be changed after boot-up through the /proc/scsi file system. The generic command is: echo "setsync #target period" >/proc/scsi/ncr53c8xx/0 Use a 25 ns period for 10 Mhz synchronous data transfers. If you don't know what to do now, go with the default. use normal IO CONFIG_SCSI_NCR53C8XX_IOMAPPED This option allows you to force the driver to use normal IO. Memory mapped IO has less latency than normal IO and works for most Intel-based hardware. Under Linux/Alpha and Linux/PPC only normal IO is currently supported by the driver and so, this option has no effect. On Linux/PPC MMIO and normal IO are done the same (all IO is memory mapped) so you lose nothing by using normal IO. The normal answer therefore is N. Try Y only if you have problems. not allow targets to disconnect CONFIG_SCSI_NCR53C8XX_NO_DISCONNECT This option is only provided for safety if you suspect some SCSI device of yours to not support properly the target-disconnect feature. In that case, you would say Y here. In general however, to not allow targets to disconnect is not reasonable if there is more than 1 device on a SCSI bus. The normal answer therefore is N. detect and read serial NVRAMs CONFIG_SCSI_NCR53C8XX_NVRAM_DETECT Enable support for reading the serial NVRAM data on Symbios and some Symbios compatible cards, and Tekram DC390W/U/F cards. Useful for systems with more than one Symbios compatible controller where at least one has a serial NVRAM, or for a system with a mixture of Symbios and Tekram cards. Enables setting the boot order of host adaptors to something other than the default order or "reverse probe" order. Also enables Symbios and Tekram cards to be distinguished so that the option "assume boards are SYMBIOS compatible" (CONFIG_SCSI_NCR53C8XX_SYMBIOS_COMPAT) below may be set in a system with a mixture of Symbios and Tekram cards so that the Symbios cards can make use of the full range of Symbios features, differential, led pin, without causing problems for the Tekram card(s). Also enables setting host and targets SCSI features as defined in the user setup for each host using a serial NVRAM. Read drivers/scsi/README.ncr53c8xx for more information. The default answer is N, the normal answer should be Y. enable tagged command queuing CONFIG_SCSI_NCR53C8XX_TAGGED_QUEUE This option allows you to enable tagged command queuing support at Linux start-up. Some SCSI devices do not properly support this feature. The suggested method is to say N here and to use the "settags" control command after boot-up to enable this feature: echo "settags 2 4" >/proc/scsi/ncr53c8xx/0 asks the driver to use up to 4 concurrent tagged commands for target 2 of controller 0. See the file drivers/scsi/README.ncr53c8xx for more information. WARNING! If you say Y here, then you have to say N to "not allow targets to disconnect", above. The safe answer therefore is N. The normal answer therefore is Y. maximum number of queued commands CONFIG_SCSI_NCR53C8XX_MAX_TAGS This option allows you to specify the maximum number of commands that can be queued to a device, when tagged command queuing is possible. The default value is 4. Minimum is 2, maximum is 12. The normal answer therefore is the default one. assume boards are SYMBIOS compatible CONFIG_SCSI_NCR53C8XX_SYMBIOS_COMPAT This option allows you to enable some features depending on GPIO wiring. These General Purpose Input/Output pins can be used for vendor specific features or implementation of the standard SYMBIOS features. Genuine SYMBIOS boards use GPIO0 in output for controller LED and GPIO3 bit as a flag indicating single-ended/differential interface. If all the boards of your system are genuine SYMBIOS boards or use BIOS and drivers from SYMBIOS, you would want to enable this option. The driver behaves correctly on my system with this option enabled. (SDMS 4.0 + Promise SCSI ULTRA 875 rev 0x3 + ASUS SC200 810A rev 0x12). This option must be set to N if your system has at least one 53C8XX based SCSI board with a vendor-specific BIOS (example: Tekram DC-390/U/W/F). However, if all your non Symbios compatible boards have NVRAM, setting option "detect and read serial NVRAMs" (CONFIG_SCSI_NCR53C8XX_NVRAM_DETECT) above allows the driver to distinguish Symbios compatible boards from other ones. So, you can answer Y if all non Symbios compatible boards have NVRAM. If unsure, say N. IBMMCA SCSI support CONFIG_SCSI_IBMMCA This is support for the IBM SCSI adapter found in many of the PS/2 series computers. These machines have an MCA bus, so you need to say Y to "MCA support" as well and read Documentation/mca.txt. If the adapter isn't found during boot (a common problem for models 56, 57, 76, and 77) you'll need to use the 'ibmmcascsi=' kernel option, where is the id of the SCSI subsystem (usually 7, but if that doesn't work check your reference diskette). Owners of model 95 with a LED-matrix-display can in addition activate some activity info like under OS/2, but more informative, by setting 'ibmmcascsi=display' as an additional kernel parameter. Try "man bootparam" or see the documentation of your boot loader about how to pass options to the kernel. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ibmmca.o. Standard SCSI-order CONFIG_IBMMCA_SCSI_ORDER_STANDARD In the PC-world and in most modern SCSI-BIOS-setups, SCSI-hard disks are assigned to the drive letters, starting with the lowest SCSI-id (physical number - pun) to be drive C:, as seen from DOS and similar operating systems. When looking into papers describing the ANSI-SCSI-standard, this assignment of drives appears to be wrong. The SCSI-standard follows a hardware-hierarchy which says that id 7 has the highest priority and id 0 the lowest. Therefore, the host adapters are still today everywhere placed as SCSI-id 7 by default. In the SCSI-standard, the drive letters express the priority of the disk. C: should be the hard disk, or a partition on it, with the highest priority. This must therefore be the disk with the highest SCSI-id (e.g. 6) and not the one with the lowest! IBM-BIOS kept the original definition of the SCSI-standard as also industrial- and process-control-machines, like VME-CPUs running under realtime-OSs (e.g. LynxOS, OS9) do. If you like to run Linux on your MCA-machine with the same assignment of hard disks as seen from e.g. DOS or OS/2 on your machine, which is in addition conformant to the SCSI-standard, you must say Y here. This is also necessary for MCA-Linux-users who want to keep downward- compatibility to older releases of the IBM-MCA-SCSI-driver (older than driver-release 2.00 and older than June 1997). If you like to have the lowest SCSI-id assigned as drive C:, as modern SCSI-BIOSes do, which does not conform to the standard, but is widespread and common in the PC-world of today, you must say N here. If unsure, say Y. Reset SCSI-devices at boot time CONFIG_IBMMCA_SCSI_DEV_RESET By default, SCSI-devices are reset when the machine is powered on. However, some devices exist, like special-control-devices, SCSI-CNC-machines, SCSI-printer or scanners of older type, that do not reset when switched on. If you say Y here, each device connected to your SCSI-bus will be issued a reset-command after it has been probed, while the kernel is booting. This may cause problems with more modern devices, like hard disks, which do not appreciate these reset commands, and can cause your system to hang. So say Y only if you know that one of your older devices needs it; N is the safe answer. Always IN2000 SCSI support CONFIG_SCSI_IN2000 This is support for an ISA bus SCSI host adapter. You'll find more information in drivers/scsi/in2000.readme. If it doesn't work out of the box, you may have to change the jumpers for IRQ or address selection. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called in2000.o. PAS16 SCSI support CONFIG_SCSI_PAS16 This is support for a SCSI host adapter. It is explained in section 3.10 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/pas16.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called pas16.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. PCI2000 support CONFIG_SCSI_PCI2000 This is support for the PCI2000I EIDE interface card which acts as a SCSI host adapter. Please read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module called pci2000.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. PCI2220i support CONFIG_SCSI_PCI2220I This is support for the PCI2220i EIDE interface card which acts as a SCSI host adapter. Please read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module called pci2220i.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. PSI240i support CONFIG_SCSI_PSI240I This is support for the PSI240i EIDE interface card which acts as a SCSI host adapter. Please read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module called psi240i.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Qlogic FAS SCSI support CONFIG_SCSI_QLOGIC_FAS This driver works only with the ISA, VLB, and PCMCIA versions of the Qlogic FastSCSI! cards as well as any other card based on the FASXX chip (including the Control Concepts SCSI/IDE/SIO/PIO/FDC cards); it does NOT support the PCI version. The PCI versions are supported by the Qlogic ISP driver though. Information about this driver is contained in drivers/scsi/README.qlogicfas. You should also read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called qlogicfas.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Qlogic ISP SCSI support (EXPERIMENTAL) CONFIG_SCSI_QLOGIC_ISP This driver works for all QLogic PCI SCSI host adapters (IQ-PCI, IQ-PCI-10, IQ_PCI-D) except for the PCI-basic card. (This latter card is supported by the "AM53/79C974 PCI SCSI" driver). If you say Y here, make sure to say Y to "PCI BIOS support" as well. More information is contained in the file drivers/scsi/README.qlogicisp. You should also read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called qlogicisp.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Seagate ST-02 and Future Domain TMC-8xx SCSI support CONFIG_SCSI_SEAGATE These are 8-bit SCSI controllers; the ST-01 is also supported by this driver. It is explained in section 3.9 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/seagate.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called seagate.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Trantor T128/T128F/T228 SCSI support CONFIG_SCSI_T128 This is support for a SCSI host adapter. It is explained in section 3.11 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/t128.h. Note that Trantor was purchased by Adaptec, and some former Trantor products are being sold under the Adaptec name. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called t128.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. UltraStor SCSI support CONFIG_SCSI_ULTRASTOR This is support for the UltraStor 14F, 24F and 34F SCSI-2 host adapter family. This driver is explained in section 3.12 of the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If it doesn't work out of the box, you may have to change some settings in drivers/scsi/ultrastor.h. Note that there is also another driver for the same hardware: "UltraStor 14F/34F support", above. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ultrastor.o. 7000FASST SCSI support CONFIG_SCSI_7000FASST This driver supports the Western Digital 7000 SCSI host adapter family. Some information is in the source: drivers/scsi/wd7000.c. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called wd7000.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. EATA ISA/EISA/PCI (DPT and generic EATA/DMA-compliant boards) support CONFIG_SCSI_EATA This driver supports all the EATA/DMA-compliant SCSI host adapters and does not need any BIOS32 service. DPT ISA and all EISA i/o addresses are probed looking for the "EATA" signature. If you said Y to "PCI bios support", the addresses of all the PCI SCSI controllers reported by BIOS32 are probed as well. You want to read the start of drivers/scsi/eata.c and the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that there is also another driver for the same hardware available: "EATA-DMA support". You should say Y to only one of them. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called eata.o. enable tagged command queuing CONFIG_SCSI_EATA_TAGGED_QUEUE This is a feature of SCSI-2 which improves performance: the host adapter can send several SCSI commands to a device's queue even if previous commands haven't finished yet. Some SCSI devices don't implement this properly, so the safe answer is N. enable elevator sorting CONFIG_SCSI_EATA_LINKED_COMMANDS This is a feature of SCSI-2 which improves performance: the host adapter can send a whole list of commands to a device in one batch. Some SCSI devices might not implement this properly, so the safe answer is N. maximum number of queued commands CONFIG_SCSI_EATA_MAX_TAGS This specifies how many SCSI commands can be maximally queued for a given SCSI device. Go with the default unless you know what you're doing. Minimum is 2 and maximum is 16. This number will only have an effect if you said Y to "enable tagged command queuing", above. NCR53c406a SCSI support CONFIG_SCSI_NCR53C406A This is support for the NCR53c406a SCSI host adapter. For user configurable parameters, check out drivers/scsi/NCR53c406.c in the kernel source. Also read the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called NCR53c406.o. Tekram DC390(T) (AMD PCscsi) SCSI support CONFIG_SCSI_DC390T This driver supports the Tekram DC390(T) PCI SCSI host adapter with the Am53C974A chip, and perhaps other cards using the same chip. This driver does _not_ support the DC390W/U/F adaptor with the NCR/Symbios chips; use "NCR53C8XX SCSI support" for that one. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called tmscsim.o. AM53/79C974 PCI SCSI support CONFIG_SCSI_AM53C974 This is support for the AM53/79C974 SCSI host adapters. Please read drivers/scsi/README.AM53C974 for details. Also, the SCSI-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO, is for you. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called AM53C974.o. GDT SCSI Disk Array Controller support CONFIG_SCSI_GDTH This is a driver for all SCSI Disk Array Controllers (EISA/ISA/PCI) manufactured by ICP vortex. It is documented in the kernel source in drivers/scsi/gdth.c and drivers/scsi/gdth.h. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. IOMEGA Parallel Port ZIP drive SCSI support CONFIG_SCSI_PPA This driver supports the parallel port version of IOMEGA's ZIP drive (a 100Mb removable media device). For more information about this driver and how to use it you should read the file drivers/scsi/README.ppa. You should also read the SCSI-HOWTO, which is available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you use this driver, you will still be able to use the parallel port for other tasks, such as a printer; it is safe to compile both drivers into the kernel. Note that you can say N here if you have the SCSI version of the ZIP drive: it will be supported automatically if you said Y to the generic "SCSI disk support", above. This driver is also available as a module which can be inserted in and removed from the running kernel whenever you want. To compile this driver as a module, say M here and read Documentation/modules.txt. The module will be called ppa.o. EPP FIFO Checking CONFIG_SCSI_PPA_HAVE_PEDANTIC EPP (Enhanced Parallel Port) is a standard for parallel ports which allows them to act as expansion buses that can handle up to 64 peripheral devices. Some parallel port chipsets are slower than their motherboard, and so we have to control the state of the FIFO every now and then to avoid data loss. The permitted values for this option are 0 (don't check FIFO), 1 (check FIFO every 4 bytes), 2 (check FIFO every other byte) and 3 (check FIFO every time). If your EPP chipset is from the SMC series, you are likely to have to set this value greater than 0. SGI wd93 Scsi Driver CONFIG_SCSI_SGIWD93 This is the SCSI driver for WD33C93 / WD33C95 SCSI chips used in many SGI machines. SCSI Debug host simulator. CONFIG_SCSI_DEBUG This is a host adapter simulator that can be programmed to simulate a large number of conditions that could occur on a real bus. The advantage is that many hard to reproduce problems can be tested in a controlled environment where there is reduced risk of losing important data. This is primarily of use to people trying to debug the middle and upper layers of the SCSI subsystem. If unsure, say N. Network device support? CONFIG_NETDEVICES You can say N here if you don't intend to connect to any other computer at all or if all your connections will be over a telephone line with a modem either via UUCP (UUCP is a protocol to forward mail and news between unix hosts over telephone lines; read the UUCP-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO) or dialing up a shell account or a BBS, even using term (term is a program which gives you almost full Internet connectivity if you have a regular dial up shell account on some Internet connected Unix computer. Read http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape)). You'll have to say Y if your computer contains a network card that you want to use under Linux (make sure you know its name because you will be asked for it and read the Ethernet-HOWTO (especially if you plan to use more than one network card under Linux), available from sunsite.unc.edu:/pub/Linux/docs/HOWTO/mini) or if you want to use SLIP (Serial Line Internet Protocol is the protocol used to send Internet traffic over telephone lines or nullmodem cables) or CSLIP (compressed SLIP) or PPP (Point to Point Protocol, a better and newer replacement for SLIP) or PLIP (Parallel Line Internet Protocol is mainly used to create a mini network by connecting the parallel ports of two local machines) or AX.25/KISS (protocol for sending Internet traffic over radio links). Make sure to read the NET-2-HOWTO. Eventually, you will have to read Olaf Kirch's excellent and free book "Network Administrator's Guide", to be found in sunsite.unc.edu:/pub/Linux/docs/LDP. If unsure, say Y. Dummy net driver support CONFIG_DUMMY This is essentially a bit-bucket device (i.e. traffic you send to this device is consigned into oblivion) with a configurable IP address. It is most commonly used in order to make your currently inactive SLIP address seem like a real address for local programs. If you use SLIP or PPP, you might want to say Y here. Read about it in the Network Administrator's Guide, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/LDP. Since this thing often comes in handy, the default is Y. It won't enlarge your kernel either. What a deal. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called dummy.o. If you want to use more than one dummy device at a time, you need to compile this driver as a module. Instead of 'dummy', the devices will then be called 'dummy0', 'dummy1' etc. SLIP (serial line) support CONFIG_SLIP Say Y if you intend to use SLIP or CSLIP (compressed SLIP) to connect to your Internet service provider or to connect to some other local Unix box or if you want to configure your Linux box as a Slip/CSlip server for other people to dial in. SLIP (Serial Line Internet Protocol) is a protocol used to send Internet traffic over telephone lines or serial cables (also known as nullmodems); nowadays, the protocol PPP is more common than SLIP. Normally, your access provider has to support SLIP in order for you to be able to use it, but there is now a SLIP emulator called SLiRP around (available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/network/serial/ ) which allows you to use SLIP over a regular dial up shell connection. If you plan to use SLiRP, make sure to say Y to CSLIP, below. The NET-2-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO, explains how to configure SLIP. Note that you don't need this option if you just want to run term (term is a program which gives you almost full Internet connectivity if you have a regular dial up shell account on some Internet connected Unix computer. Read http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape)). SLIP support will enlarge your kernel by about 4kB. If unsure, say N. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called slip.o. CSLIP compressed headers CONFIG_SLIP_COMPRESSED This protocol is faster than SLIP because it uses compression on the TCP/IP headers (not on the data itself), but it has to be supported on both ends. Ask your access provider if you are not sure and say Y, just in case. You will still be able to use plain SLIP. If you plan to use SLiRP, the SLIP emulator (available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/network/serial/) which allows you to use SLIP over a regular dial up shell connection, you definitely want to say Y here. The NET-2-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO, explains how to configure CSLIP. This won't enlarge your kernel. Keepalive and linefill CONFIG_SLIP_SMART Adds additional capabilities to the SLIP driver to support the RELCOM line fill and keepalive monitoring. Ideal on poor quality analogue lines. Six bit SLIP encapsulation CONFIG_SLIP_MODE_SLIP6 Just occasionally you may need to run IP over hostile serial networks that don't pass all control characters or are only seven bit. Saying Y here adds an extra mode you can use with SLIP: "slip6". In this mode, SLIP will only send normal ascii symbols over the serial device. Naturally, this has to be supported at the other end of the link as well. It's good enough, for example, to run IP over the async ports of a Camtec JNT Pad. If unsure, say N. PPP (point-to-point) support CONFIG_PPP PPP (Point to Point Protocol) is a newer and better SLIP. It serves the same purpose: sending Internet traffic over telephone (and other serial) lines. Ask your access provider if they support it, because otherwise you can't use it (not quite true any more: the free program SLiRP can emulate a PPP line if you just have a regular dial up shell account on some UNIX computer; get it via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/network/serial/). Note that you don't need "PPP support" if you just want to run term (term is a program which gives you almost full Internet connectivity if you have a regular dial up shell account on some Internet connected UNIX computer. Read http://www.bart.nl/~patrickr/term-howto/Term-HOWTO.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape)). To use PPP, you need an additional program called pppd as described in Documentation/networking/ppp.txt and in the PPP-HOWTO, available from sunsite.unc.edu:/pub/Linux/docs/HOWTO. If you upgrade from an older kernel, you might need to upgrade pppd as well. The PPP option enlarges your kernel by about 16kB. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you said Y to "Version information on all symbols" above, then you cannot compile the PPP driver into the kernel; you can then only compile it as a module. The module will be called ppp.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Note that, no matter what you do, the BSD compression code (used to compress the IP packets sent over the serial line; has to be supported at the other end as well) will always be compiled as a module; it is called bsd_comp.o and will show up in the directory modules once you have said "make modules". If unsure, say N. Wireless LAN (non-hamradio) CONFIG_NET_RADIO Support for wireless LAN's and everything having to do with radio, but not with amateur radio. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about radio interfaces. Some user-level drivers for scarab devices which don't require special kernel support are available via ftp (user: anonymous) from ftp://shadow.cabi.net/pub/Linux. STRIP (Metricom Starmode radio IP) CONFIG_STRIP Say Y if you have a Metricom radio and intend to use Starmode Radio IP. STRIP is a radio protocol developed for the MosquitoNet project (On the WWW at http://mosquitonet.stanford.edu/; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) to send Internet traffic using Metricom radios. Metricom radios are small, battery powered, 100kbit/sec packet radio transceivers, about the size and weight of a cellular telephone. (You may also have heard them called "Metricom modems" but we avoid the term "modem" because it misleads many people into thinking that you can plug a Metricom modem into a phone line and use it as a modem.) You can use STRIP on any Linux machine with a serial port, although it is obviously most useful for people with laptop computers. If you think you might get a Metricom radio in the future, there is no harm in saying Y to STRIP now, except that it makes the kernel a bit bigger. You can also compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called strip.o. AT&T WaveLAN & DEC RoamAbout DS support CONFIG_WAVELAN The Lucent Wavelan (formerly NCR and AT&T ; or DEC RoamAbout DS) is a Radio LAN (wireless Ethernet-like Local Area Network) using the radio frequencies 900 MHz and 2.4 GHz. This driver support the ISA version of the Wavelan card. A separate driver for the pcmcia hardware is available in David Hinds's pcmcia package. If you want to use an ISA Wavelan card under Linux, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Some more specific information is contained in Documentation/networking/wavelan.txt. You will also need the wireless tools package available from ftp://ftp.inka.de/pub/comp/Linux/networking/NetTools/contrib/. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called wavelan.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Radio support CONFIG_MISC_RADIO If you have a radio card (which enables your computer to receive regular radio broadcasts), then you will want to say Y here and make a character device file (usually /dev/radio) with major number 10 and minor 152 using mknod ("man mknod"). And then, don't forget to pick up some useful tools to use said device (you _might_ find something at ftp://ftp.lmh.ox.ac.uk/users/weejock/linux/, but I haven't written anything too useful yet...) AIMSlab RadioTrack card CONFIG_RADIO_RTRACK Choose Y here if you have one of these, and then fill in the port address below. RadioTrack i/o port CONFIG_RADIO_RTRACK_PORT Enter either 0x30f or 0x20f here. The card default is 0x30f, if you haven't changed the jumper setting on the card. LAPB over Ethernet driver CONFIG_LAPBETHER This is a driver for a pseudo device (typically called /dev/lapb0) which allows you to open an LAPB point-to-point connection to some other computer on your Ethernet network. In order to do this, you need to say Y or M to the driver for your Ethernet card as well as to "LAPB Data Link Driver". If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called lapbether.o. If unsure, say N. X.25 async driver CONFIG_X25_ASY This is a driver for sending and receiving X.25 frames over regular asynchronous serial lines such as telephone lines equipped with ordinary modems. Experts should note that this driver doesn't currently comply with the asynchronous HDLS framing protocols in CCITT recommendation X.25. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called x25_asy.o. If unsure, say N. Shortwave radio modem driver CONFIG_HFMODEM This experimental driver is used by a package (to be released) that implements the shortwave radio protocols RTTY, Sitor (Amtor), Pactor 1 and GTOR using a standard PC sound card. If unsure, say N. Shortwave radio modem driver support for SoundBlaster and compatible cards CONFIG_HFMODEM_SBC This option enables the hfmodem driver to use SoundBlaster and compatible cards. It requires a 16bit capable card, i.e. SB16 or better, or ESS1688 or newer. Shortwave radio modem driver support for WSS and Crystal cards CONFIG_HFMODEM_WSS This option enables the hfmodem driver to use WindowsSoundSystem compatible cards. These cards feature a codec chip from either Analog Devices (such as AD1848, AD1845) or Crystal Semiconductors (such as CS4248, CS423x). PLIP (parallel port) support CONFIG_PLIP PLIP (Parallel Line Internet Protocol) is used to create a reasonably fast mini network consisting of two (or, rarely, more) local machines. A PLIP link from a Linux box is a popular means to install a Linux distribution on a machine which doesn't have a CDROM drive (a minimal system has to be transferred with floppies first). The kernels on both machines need to have this PLIP option enabled for this to work. The PLIP driver has two modes, mode 0 and mode 1. The parallel ports (the connectors at the computers with 25 holes) are connected with "null printer" or "Turbo Laplink" cables which can transmit 4 bits at a time (mode 0) or with special PLIP cables, to be used on bidirectional parallel ports only, which can transmit 8 bits at a time (mode 1); you can find the wiring of these cables in Documentation/networking/PLIP.txt. The cables can be up to 15m long. Mode 0 works also if one of the machines runs DOS/Windows and has some PLIP software installed, e.g. the Crynwr PLIP packet driver (http://oak.oakland.edu/simtel.net/msdos/pktdrvr-pre.html; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) and winsock or NCSA's telnet. If you want to use PLIP, say Y and read the PLIP mini-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini as well as the NET-2-HOWTO in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the PLIP protocol was changed and this PLIP driver won't work together with the PLIP support in Linux versions 1.0.x. This option enlarges your kernel by about 8kB. If you want to compile this as a module (= code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called plip.o. If unsure, say Y or M, in case you buy a laptop later. EQL (serial line load balancing) support CONFIG_EQUALIZER If you have two serial connections to some other computer (this usually requires two modems and two telephone lines) and you use SLIP (= the protocol for sending Internet traffic over telephone lines) or PPP (= a better SLIP) on them, you can make them behave like one double speed connection using this driver. Naturally, this has to be supported at the other end as well, either with a similar EQL Linux driver or with a Livingston Portmaster 2e. Say Y if you want this and read Documentation/networking/eql.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called eql.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say N. Ethertap network tap CONFIG_ETHERTAP If you say Y here (and have said Y to "Kernel/User network link driver", above) and create a character special file /dev/tap0 with major number 36 and minor number 16 using mknod ("man mknod"), you will be able to have a user space program read and write raw Ethernet frames from/to that special file. tap0 can be configured with ifconfig and route like any other Ethernet device but it is not connected to any physical LAN; everything written by the user to /dev/tap0 is treated by the kernel as if it had come in from a LAN to the device tap0; everything the kernel wants to send out over the device tap0 can instead be read by the user from /dev/tap0: the user mode program replaces the LAN that would be attached to an ordinary Ethernet device. Please read the file Documentation/networking/ethertap.txt for more information. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ethertap.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If you don't know what to use this for, you don't need it. Frame Relay (DLCI) support CONFIG_DLCI This is support for the frame relay protocol; frame relay is a fast low-cost way to connect to a remote Internet access provider or to form a private wide area network. The one physical line from your box to the local "switch" (i.e. the entry point to the frame relay network, usually at the phone company) can carry several logical point-to-point connections to other computers connected to the frame relay network. For a general explanation of the protocol, check out http://www.frforum.com/ on the WWW. (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape.) To use frame relay, you need supporting hardware (called FRAD) and certain programs from the net-tools package as explained in Documentation/networking/framerelay.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called dlci.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Max open DLCI CONFIG_DLCI_COUNT This is the maximal number of logical point-to-point frame relay connections (the identifiers of which are called DCLIs) that the driver can handle. The default is probably fine. Max DLCI per device CONFIG_DLCI_MAX You can specify here how many logical point-to-point frame relay connections (the identifiers of which are called DCLIs) should be handled by each of your hardware frame relay access devices. Go with the default. Sangoma S502A FRAD support CONFIG_SDLA Say Y here if you need a driver for the Sangoma S502A, S502E, and S508 Frame Relay Access Devices. These are multi-protocol cards, but only frame relay is supported by the driver at this time. Please read Documentation/framerelay.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sdla.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. WAN Router CONFIG_WAN_ROUTER Wide Area Networks (WANs), such as X.25, frame relay and leased lines, are used to interconnect Local Area Networks (LANs) over vast distances with data transfer rates significantly higher than those achievable with commonly used asynchronous modem connections. Usually, a quite expensive external device called a `WAN router' is needed to connect to a WAN. As an alternative, WAN routing can be built into the Linux kernel. With relatively inexpensive WAN interface cards available on the market, a perfectly usable router can be built for less than half the price of an external router. If you have one of those cards and wish to use your Linux box as a WAN router, say Y here and to the WAN driver for your card, below. You will also need a wan-tools package available via FTP (user: anonymous) from ftp://ftp.sangoma.com. Read Documentation/networking/wan-router.txt for more information. WAN routing support is always built as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called wanrouter.o. For general information about modules read Documentation/modules.txt. Fast switching (read help!) CONFIG_NET_FASTROUTE Saying Y here enables direct NIC-to-NIC (NIC = Network Interface Card) data transfers, which is fast. *** This option is NOT COMPATIBLE with several important *** *** networking options: especially CONFIG*FIREWALL. *** However, it will work with all options in CONFIG_IP_ADVANCED_ROUTER section (except for CONFIG_IP_ROUTE_TOS). At the moment, few devices support fast switching (tulip is one of them, modified 8390 can be found at ftp://ftp.inr.ac.ru/ip-routing/fastroute-8390.tar.gz). If unsure, say N. Forwarding between high speed interfaces CONFIG_NET_HW_FLOWCONTROL This option enables NIC (Network Interface Card) hardware throttling during periods of extremal congestion. At the moment only a couple of device drivers support it (really only one ---tulip, modified 8390 can be found at ftp://ftp.inr.ac.ru/ip-routing/fastroute-8390.tar.gz). Really, this option is applicable to any machine attached to a fast enough network, and even a 10Mb NIC is able to kill a not very slow box, such as a 120MHz Pentium. However, do not say Y here if you did not experience any serious problems. CPU is too slow to handle full bandwidth CONFIG_CPU_IS_SLOW If you suspect that your CPU is not fast enough to handle the full bandwidth of your network connection, try saying Y here. If unsure, say N. QoS and/or fair queueing CONFIG_NET_SCHED When the kernel has several packets to send out over the network devices, it has to make a decision which one to send first. This is especially important if some of the network devices are real time devices that need a certain minimum data flow rate. There are several different algorithms for how to do this "fairly"; they are called packet schedulers. You can attach different schedulers to different network devices. If you want to stick to the default scheduling algorithm, say N here. If you want to experiment with a couple of different algorithms, say Y. To administer these schedulers, you'll need the user-level utilities from the package iproute2+tc at ftp://ftp.inr.ac.ru/ip-routing/ The available schedulers are listed in the following questions; you can say Y to as many as you like. If unsure, say N now. CBQ packet scheduler CONFIG_NET_SCH_CBQ Say Y here if you want to use the Class-Based Queueing (CBQ) packet scheduling algorithm for some of your network devices. This algorithm classifies the waiting packets into a tree-like hierarchy of classes; the leaves of this tree are in turn scheduled by separate algorithms (called "disciplines" in this context) which you can choose below from among the "auxiliary disciplines". See the top of net/sched/sch_cbq.c for references about the CBQ algorithm. This code is also available as a module called sch_cbq.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. CSZ packet scheduler CONFIG_NET_SCH_CSZ Say Y here if you want to use the Clark-Shenker-Zhang (CSZ) packet scheduling algorithm for some of your network devices. At the moment, this is the only algorithm that can guarantee service for real-time applications (see the top of net/sched/sch_csz.c for details and references about the algorithm). Note: this scheduler is currently broken. This code is also available as a module called sch_csz.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. RED queueing discipline CONFIG_NET_SCH_RED Say Y here if you want to use the Random Early Detection (RED) packet scheduling algorithm for some of your network devices (see the top of net/sched/sch_red.c for details and references about the algorithm). This code is also available as a module called sch_red.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. SFQ queueing discipline CONFIG_NET_SCH_SFQ Say Y here if you want to use the Stochastic Fairness Queueing (SFQ) packet scheduling algorithm for some of your network devices or as a leaf discipline for the CBQ scheduling algorithm (see the top of net/sched/sch_sfq.c for details and references about the SFQ algorithm). This code is also available as a module called sch_sfq.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. auxiliary TBF queue CONFIG_NET_SCH_TBF Say Y here if you want to use the Simple Token Bucket Filter (TBF) packet scheduling algorithm for some of your network devices or as a leaf discipline for the CBQ scheduling algorithm (see the top of net/sched/sch_tbf.c for a description of the TBF algorithm). This code is also available as a module called sch_tbf.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. auxiliary FIFO queue CONFIG_NET_SCH_PFIFO Say Y here if you want to use a simple FIFO (first in - first out) packet "scheduler" for some of your network devices or as a leaf discipline for the CBQ scheduling algorithm. This code is also available as a module called sch_fifo.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. auxiliary PRIO queue CONFIG_NET_SCH_PRIO Say Y here if you want to use an n-band priority queue packet "scheduler" for some of your network devices or as a leaf discipline for the CBQ scheduling algorithm. This code is also available as a module called sch_prio.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Network code profiler CONFIG_NET_PROFILE If you say Y here and to "/proc filesystem support" below, some obscure and undocumented information about the network code's performance will be written to /proc/net/profile. If you don't know what it is about, you don't need it: say N. WAN Drivers CONFIG_WAN_DRIVERS Say Y to this option if your Linux box contains a WAN card and you are planning to use the box as a WAN ( = Wide Area Network) router ( = device used to interconnect local area networks over wide area communication links, such as leased lines and public data networks, e.g. X.25 and frame relay) and you will be offered a list of drivers for WAN cards currently available. For more information, read Documentation/networking/wan-router.txt. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about WAN card drivers. If unsure, say N. Sangoma WANPIPE(tm) multiprotocol cards CONFIG_VENDOR_SANGOMA WANPIPE from Sangoma Technologies Inc. (http://www.sangoma.com; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) is a family of intelligent multiprotocol WAN adapters with data transfer rates up to T1 (1.544 Mbps). They are also known as Synchronous Data Link Adapters (SDLA) and designated S502E(A), S503 or S508. These cards support the X.25, Frame Relay, and PPP protocols. If you have one or more of these cards, say Y to this option and read Documentation/networking/wanpipe.txt. The next questions will ask you about the protocols you want the driver to support. The driver will be compiled as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called wanpipe.o. For general information about modules read Documentation/modules.txt. Maximum number of cards CONFIG_WANPIPE_CARDS Enter number of WANPIPE adapters installed in your machine. The driver can support up to 8 cards. You may enter more than you actually have if you plan to add more cards in the future without re-compiling the driver, but remember that in this case you'll waste some kernel memory (about 1K per card). WANPIPE X.25 support CONFIG_WANPIPE_X25 Say Y to this option if you are planning to connect a WANPIPE card to an X.25 network. You should then also have said Y to "CCITT X.25 Packet Layer" and "LAPB Data Link Driver", above. If you say N, the X.25 support will not be included in the driver (saves about 16K of kernel memory). WANPIPE Frame Relay support CONFIG_WANPIPE_FR Say Y to this option if you are planning to connect a WANPIPE card to a frame relay network. You should then also have said Y to "Frame Relay (DLCI) support", above. If you say N, the frame relay support will not be included in the driver (saves about 16K of kernel memory). WANPIPE PPP support CONFIG_WANPIPE_PPP Say Y to this option if you are planning to connect a WANPIPE card to a leased line using Point-to-Point protocol (PPP). You should then also have said Y to "PPP (point-to-point) support", above. If you say N, the PPP support will not be included in the driver (saves about 16K of kernel memory). Ethernet (10 or 100Mbit) CONFIG_NET_ETHERNET Ethernet (also called IEEE 802.3 or ISO 8802-2) is the most common type of Local Area Networks (LANs) in universities or companies. 10-base-2 or Thinnet (10 Mbps over coaxial cable, linking computers in a chain), 10-base-T (10 Mbps over twisted pair telephone cable, linking computers to a central hub) and 100-base- (100 Mbps) are common types of Ethernet. If your Linux machine will be connected to an Ethernet and you have an Ethernet network card installed in your computer, say Y here and read the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about Ethernet network cards. If unsure, say N. Sun LANCE Ethernet support CONFIG_SUN_LANCE This is support for lance Ethernet cards on Sun workstations such as the Sparcstation IPC (any Sparc with a network interface 'le0' under SunOS basically). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called lance.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Sun Intel Ethernet support CONFIG_SUN_INTEL This is support for the Intel Ethernet cards on some Sun workstations (all those with a network interface 'ie0' under SunOS). Western Digital/SMC cards CONFIG_NET_VENDOR_SMC If you have a network (Ethernet) card belonging to this class, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about Western Digital cards. If you say Y, you will be asked for your specific card in the following questions. WD80*3 support CONFIG_WD80x3 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called wd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. SMC Ultra MCA support CONFIG_ULTRAMCA If you have a network (Ethernet) card of this type and are running an MCA based system (PS/2), say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called smc-mca.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. SMC Ultra support CONFIG_ULTRA If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Important: There have been many reports that, with some motherboards mixing an SMC Ultra and an Adaptec AHA154x SCSI card (or compatible, such as some BusLogic models) causes corruption problems with many operating systems. The Linux smc-ultra driver has a work-around for this but keep it in mind if you have such a SCSI card and have problems. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called smc-ultra.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. SMC Ultra32 EISA support CONFIG_ULTRA32 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called smc-ultra32.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. SMC 9194 Support CONFIG_SMC9194 This is support for the SMC9xxx based Ethernet cards. Choose this option if you have a DELL laptop with the docking station, or another SMC9192/9194 based chipset. Say Y if you want it compiled into the kernel, and read the the file Documentation/networking/smc9.txt and the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called smc9194.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Racal-Interlan (Micom) NI cards CONFIG_NET_VENDOR_RACAL If you have a network (Ethernet) card belonging to this class, such as the NI5010, NI5210 or NI6210, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about NI cards. If you say Y, you will be asked for your specific card in the following questions. NI5010 support CONFIG_NI5010 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that this is still experimental code. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ni5010.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. NI5210 support CONFIG_NI52 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ni52.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. NI6510 support CONFIG_NI65 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ni65.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. AMD LANCE and PCnet (AT1500 and NE2100) support CONFIG_LANCE If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Some LinkSys cards are of this type. 3COM cards CONFIG_NET_VENDOR_3COM If you have a network (Ethernet) card belonging to this class, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about 3COM cards. If you say Y, you will be asked for your specific card in the following questions. 3c501 support CONFIG_EL1 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Also, consider buying a new card, since the 3c501 is slow, broken, and obsolete: you will have problems. Some people suggest to ping ("man ping") a nearby machine every minute ("man cron") when using this card. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called 3c501.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. 3c503 support CONFIG_EL2 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called 3c503.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. 3c505 support CONFIG_ELPLUS Information about this network (Ethernet) card can be found in Documentation/networking/3c505.txt. If you have a card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called 3c505.o. 3c507 support CONFIG_EL16 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called 3c507.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. 3c523 support CONFIG_ELMC If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called 3c523.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. 3c509/3c579 support CONFIG_EL3 If you have a network (Ethernet) card belonging to the 3Com EtherLinkIII series, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If your card is not working you may need to use the DOS setup disk to disable Plug & Play mode, and to select the default media type. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called 3c509.o. 3c590 series (592/595/597) "Vortex" support CONFIG_VORTEX If you have a 3Com "Vortex" or "Boomerang" series network (Ethernet) card (Fast EtherLink 3c590/3c592/3c595/3c597 or the EtherLink XL 3c900 or 3c905), say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. More specific information is in Documentation/networking/vortex.txt and in the comments at the beginning of drivers/net/3c59x.c. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Other ISA cards CONFIG_NET_ISA If your network (Ethernet) card hasn't been mentioned yet and its bus system (that's the way the components of the card talk to each other) is ISA (as opposed to EISA, VLB or PCI), say Y. Make sure you know the name of your card. Read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If unsure, say Y. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the remaining ISA network card questions. If you say Y, you will be asked for your specific card in the following questions. Generic ARCnet support CONFIG_ARCNET If you have a network card of this type, say Y and check out the (arguably) beautiful poetry in Documentation/networking/arcnet.txt. You need both this driver, and the driver for the particular ARCnet chipset of your card. If you don't know, then it's probably a COM90xx type card, so say Y (or M) to "ARCnet COM90xx chipset support" below. You might also want to have a look at the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO (even though ARCnet is not really Ethernet). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called arcnet.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Enable arc0e (ARCnet "ether-encap" packet format) CONFIG_ARCNET_ETH This allows you to use "Ethernet encapsulation" with your ARCnet card via the virtual arc0e device. You only need arc0e if you want to talk to nonstandard ARCnet software, specifically, DOS/Windows-style "NDIS" drivers. You do not need to say Y here to communicate with industry-standard RFC1201 implementations, like the arcether.com packet driver or most DOS/Windows ODI drivers. RFC1201 is included automatically as the arc0 device. Please read the ARCnet documentation in Documentation/networking/arcnet.txt for more information about using arc0e and arc0s. Enable arc0s (ARCnet RFC1051 packet format) CONFIG_ARCNET_1051 This allows you to use RFC1051 with your ARCnet card via the virtual arc0s device. You only need arc0s if you want to talk to ARCnet software complying with the "old" standard, specifically, the DOS arcnet.com packet driver, Amigas running AmiTCP, and some variants of NetBSD. You do not need to say Y here to communicate with industry-standard RFC1201 implementations, like the arcether.com packet driver or most DOS/Windows ODI drivers. RFC1201 is included automatically as the arc0 device. Please read the ARCnet documentation in Documentation/networking/arcnet.txt for more information about using arc0e and arc0s. ARCnet COM90xx (normal) chipset driver CONFIG_ARCNET_COM90xx This is the chipset driver for the standard COM90xx cards. If you have always used the old arcnet driver without knowing what type of card you had, this is probably the one for you. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called com90xx.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. ARCnet COM90xx (IO mapped) chipset driver CONFIG_ARCNET_COM90xxIO This is the chipset driver for the COM90xx cards, using them in IO-mapped mode instead of memory-mapped mode. This is slower than the normal driver. Only use it if your card doesn't support shared memory. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called com90io.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. ARCnet COM90xx (RIM I) chipset driver CONFIG_ARCNET_RIM_I This is yet another chipset driver for the COM90xx cards, but this time only using memory-mapped mode, and no IO ports at all. This driver is completely untested, so if you have one of these cards, please mail dwmw2@cam.ac.uk, especially if it works! This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called arc-rimi.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. ARCnet COM20020 chipset driver CONFIG_ARCNET_COM20020 This is the driver for the new COM20020 chipset. It supports such things as promiscuous mode, so packet sniffing is possible, and extra diagnostic information. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called com20020.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Cabletron E21xx support CONFIG_E2100 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called e2100.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. CS89x0 support CONFIG_CS89x0 Support for CS89x0 chipset based Ethernet cards. If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO as well as Documentation/networking/cs89x0.txt. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called cs89x.o. DEPCA support CONFIG_DEPCA If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO as well as drivers/net/depca.c. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called depca.o. EtherWorks 3 support CONFIG_EWRK3 This driver supports the DE203, DE204 and DE205 network (Ethernet) cards. If this is for you, say Y and read Documentation/networking/ewrk3.txt in the kernel source as well as the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called ewrk3.o. SEEQ8005 support CONFIG_SEEQ8005 This is a driver for the SEEQ 8005 network (Ethernet) card. If this is for you, read the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. AT1700 support CONFIG_AT1700 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called at1700.o. FMV-181/182/183/184 support CONFIG_FMV18X If you have a Fujitsu FMV-181/182/183/184 network (Ethernet) card, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you use an FMV-183 or FMV-184 and it is not working, you may need to disable Plug & Play mode of the card. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called fmv18x.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. EtherExpressPro support CONFIG_EEXPRESS_PRO If you have a network (Ethernet) card of this type, say Y. Note however that the EtherExpressPro 100 Ethernet card has its own separate driver. Please read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called eepro.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. EtherExpress support CONFIG_EEXPRESS If you have an EtherExpress16 network (Ethernet) card, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the Intel EtherExpress16 card used to be regarded as a very poor choice because the driver was very unreliable. We now have a new driver that should do better. If you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called eexpress.o. HP PCLAN+ (27247B and 27252A) support CONFIG_HPLAN_PLUS If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called hp-plus.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. HP PCLAN (27245 and other 27xxx series) support CONFIG_HPLAN If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called hp.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. HP 10/100VG PCLAN (ISA, EISA, PCI) support CONFIG_HP100 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called hp100.o. NE2000/NE1000 support CONFIG_NE2000 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Many Ethernet cards without a specific driver are compatible with NE2000. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ne.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. SK_G16 support CONFIG_SK_G16 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. EISA, VLB, PCI and on board controllers CONFIG_NET_EISA This is another class of network cards which attach directly to the bus. If you have one of those, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about this class of network cards. If you say Y, you will be asked for your specific card in the following questions. If you are unsure, say Y. AMD PCnet32 (VLB and PCI) support CONFIG_PCNET32 If you have a PCnet32 or PCnetPCI based network (Ethernet) card, say Y here and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Ansel Communications EISA 3200 support CONFIG_AC3200 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ac3200.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Racal-Interlan EISA ES3210 support CONFIG_ES3210 If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called es3210.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Apricot Xen-II on board Ethernet CONFIG_APRICOT If you have a network (Ethernet) controller of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. The module will be called apricot.o. Generic DECchip & DIGITAL EtherWORKS PCI/EISA CONFIG_DE4X5 This is support for the DIGITAL series of PCI/EISA Ethernet cards. These include the DE425, DE434, DE435, DE450 and DE500 models. If you have a network card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. More specific information is contained in Documentation/networking/de4x5.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called de4x5.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. DECchip Tulip (dc21x4x) PCI support CONFIG_DEC_ELCP This driver is developed for the SMC EtherPower series Ethernet cards and also works with cards based on the DECchip 21040/21041/21140 (Tulip series) chips. Some LinkSys PCI cards are of this type. (If your card is NOT SMC EtherPower 10/100 PCI (smc9332dst), you can also try the driver for "Generic DECchip" cards, above. However, most people with a network card of this type will say Y here.) Do read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. More specific information is contained in Documentation/networking/tulip.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called tulip.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Digi Intl. RightSwitch support CONFIG_DGRS This is support for the Digi International RightSwitch series of PCI/EISA Ethernet switch cards. These include the SE-4 and the SE-6 models. If you have a network card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. More specific information is contained in Documentation/networking/dgrs.txt. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called dgrs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. EtherExpressPro/100 support CONFIG_EEXPRESS_PRO100 If you have an Intel EtherExpressPro 100 PCI network (Ethernet) card, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called eepro100.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. ICL EtherTeam 16i/32 support CONFIG_ETH16I If you have a network (Ethernet) card of this type, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called eth16i.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. TI ThunderLAN support (EXPERIMENTAL) CONFIG_TLAN If you have a TLAN based network card which is supported by this driver, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Devices currently supported are the Compaq Netelligent 10, Netelligent 10/100, and Internal NetFlex 3. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called tlan.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Please email feedback to james.banks@caldera.com. SMC EtherPower II (EXPERIMENTAL) CONFIG_EPIC100 If you have an SMC EtherPower II 9432 PCI ethernet network card which is based on the SMC83c170, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called epic100.o. If you want to compile it as a module, say M here and read Documentation/modules.txt as well as Documentation/networking/net-modules.txt. Zenith Z-Note support CONFIG_ZNET The Zenith Z-Note notebook computer has a built-in network (Ethernet) card, and this is the Linux driver for it. Note that the IBM Thinkpad 300 is compatible with the Z-Note and is also supported by this driver. Read the Ethernet-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Pocket and portable adapters CONFIG_NET_POCKET Cute little network (Ethernet) devices which attach to the parallel port ("pocket adapters"), commonly used with laptops. If you have one of those, say Y and read the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to plug a network card into the PCMCIA slot of your laptop instead (PCMCIA is the standard for credit card size extension cards used by all modern laptops), look on the ftp site (user: anonymous) ftp://cb-iris.stanford.edu/pub/pcmcia and say N here. Laptop user want to read the Linux Laptop homepage at http://www.cs.utexas.edu/users/kharker/linux-laptop/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about this class of network devices. If you say Y, you will be asked for your specific device in the following questions. AT-LAN-TEC/RealTek pocket adapter support CONFIG_ATP This is a network (Ethernet) device which attaches to your parallel port. Read drivers/net/atp.c as well as the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO if you want to use this. If you intend to use this driver, you should have said N to the Parallel Printer support, because the two drivers don't like each other. D-Link DE600 pocket adapter support CONFIG_DE600 This is a network (Ethernet) device which attaches to your parallel port. Read Documentation/networking/DLINK.txt as well as the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO if you want to use this. It is possible to have several devices share a single parallel port and it is safe to compile the corresponding drivers into the kernel. If you want to compile this driver as a module however ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called de600.o. D-Link DE620 pocket adapter support CONFIG_DE620 This is a network (Ethernet) device which attaches to your parallel port. Read Documentation/networking/DLINK.txt as well as the Ethernet-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO if you want to use this. It is possible to have several devices share a single parallel port and it is safe to compile the corresponding drivers into the kernel. If you want to compile this driver as a module however ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called de620.o. Token Ring driver support CONFIG_TR Token Ring is IBM's way of communication on a local network; the rest of the world uses Ethernet. To participate on a Token Ring network, you need a special Token ring network card. If you are connected to such a Token Ring network and want to use your Token Ring card under Linux, say Y here and to the driver for your particular card below and read the Token-Ring mini-HOWTO, available via ftp (user:anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Most people can say N here. IBM Tropic chipset based adapter support CONFIG_IBMTR This is support for all IBM Token Ring cards that don't use DMA. If you have such a beast, say Y and read the Token-Ring mini-HOWTO, available via ftp (user:anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Warning: this driver will almost definitely fail if more than one active Token Ring card is present. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ibmtr.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Traffic Shaper (EXPERIMENTAL) CONFIG_SHAPER The traffic shaper is a virtual network device that allows you to limit the rate of outgoing data flow over some other network device. See Documentation/networking/shaper.txt for more information. To set up and configure shaper devices, you need the shapecfg program, available via ftp (user: anonymous) from ftp://shadow.cabi.net/pub/Linux in the shaper package. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called shaper.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say N. FDDI driver support CONFIG_FDDI Fiber Distributed Data Interface is a high speed local area network design; essentially a replacement for high speed Ethernet. FDDI can run over copper or fiber. If you are connected to such a network and want a driver for the FDDI card in your computer, say Y here (and then also Y to the driver for your FDDI card, below). Most people will say N. Digital DEFEA and DEFPA adapter support CONFIG_DEFXX This is support for the DIGITAL series of EISA (DEFEA) and PCI (DEFPA) controllers which can connect you to a local FDDI network. SGI Seeq ethernet controller support This is a driver for the Seeq based Ethernet adapters used in many Silicon Graphics machines. Support CDROM drives that are not SCSI or IDE/ATAPI CONFIG_CD_NO_IDESCSI If you have a CDROM drive that is neither SCSI nor IDE/ATAPI, say Y here, otherwise N. Read the CDROM-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about these CDROM drives. If you are unsure what you have, say Y and find out whether you have one of the following drives. For each of these drivers, a file Documentation/cdrom/ exists. Especially in cases where you do not know exactly which kind of drive you have you should read there. Most of these drivers use a file drivers/cdrom/.h where you can define your interface parameters and switch some internal goodies. All these CDROM drivers are also usable as a module (= code which can be inserted in and removed from the running kernel whenever you want). If you want to compile them as module, say M instead of Y and read Documentation/modules.txt. If you want to use any of these CDROM drivers, you also have to say Y to "ISO9660 cdrom filesystem support" below (this answer will get "defaulted" for you if you enable any of the Linux CDROM drivers). Sony CDU31A/CDU33A CDROM support CONFIG_CDU31A These CDROM drives have a spring-pop-out caddyless drawer, and a rectangular green LED centered beneath it. NOTE: these CDROM drives will not be auto detected by the kernel at boot time; you have to provide the interface address as an option to the kernel at boot time as described in Documentation/cdrom/cdu31a or fill in your parameters into drivers/cdrom/cdu31a.c. Try "man bootparam" or see the documentation of your boot loader (lilo or loadlin) about how to pass options to the kernel. The lilo procedure is also explained in the SCSI-HOWTO. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called cdu31a.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Standard Mitsumi [no XA/Multisession] CDROM support CONFIG_MCD This is the older of the two drivers for the older Mitsumi models LU-005, FX-001 and FX-001D. This is not the right driver for the FX-001DE and the triple or quad speed models (all these are IDE/ATAPI models). Please also the file Documentation/cdrom/mcd. With the old LU-005 model, the whole drive chassis slides out for cd insertion. The FX-xxx models use a motorized tray type mechanism. Note that this driver does not support XA or MultiSession CDs (PhotoCDs). There is a new driver (next question) which can do this. If you want that one, say N here. If the driver doesn't work out of the box, you might want to have a look at drivers/cdrom/mcd.h. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called mcd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Mitsumi [XA/MultiSession] support CONFIG_MCDX Use this driver if you want to be able to read XA or MultiSession CDs (PhotoCDs) as well as ordinary CDs with your Mitsumi LU-005, FX-001 or FX-001D CDROM drive. In addition, this driver uses much less kernel memory than the old one, if that is a concern. This driver is able to support more than one drive, but each drive needs a separate interface card. Please read the file Documentation/cdrom/mcdx. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called mcdx.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Matsushita/Panasonic/Creative, Longshine, TEAC CDROM support CONFIG_SBPCD This driver supports most of the drives which use the Panasonic or SoundBlaster interface. Please read the file Documentation/cdrom/sbpcd. The Matsushita CR-521, CR-522, CR-523, CR-562, CR-563 drives (sometimes labeled "Creative"), the CreativeLabs CD200, the Longshine LCS-7260, the "IBM External ISA CDROM" (in fact a CR-56x model), the TEAC CD-55A fall under this category. Some other "electrically compatible" drives (Vertos, Genoa, some Funai models) are currently not supported; for the Sanyo H94A drive currently a separate driver (asked later) is responsible. Most drives have a uniquely shaped faceplate, with a caddyless motorized drawer, but without external brand markings. The older CR-52x drives have a caddy and manual loading/eject, but still no external markings. The driver is able to do an extended auto-probing for interface addresses and drive types; this can help to find facts in cases you are not sure, but can consume some time during the boot process if none of the supported drives gets found. Once your drive got found, you should enter the reported parameters into drivers/cdrom/sbpcd.h and set "DISTRIBUTION 0" there. This driver can support up to four CDROM controller cards, and each card can support up to four CDROM drives; if you say Y here, you will be asked how many controller cards you have. If compiled as a module, only one controller card (but with up to four drives) is usable. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sbpcd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Matsushita/Panasonic, ... second CDROM controller support CONFIG_SBPCD2 Say Y here only if you have two CDROM controller cards of this type (usually only if you have more than four drives). You should enter the parameters for the second, third and fourth interface card into linux/include/linux/sbpcd.h before compiling the new kernel. Read the file Documentation/cdrom/sbpcd. Aztech/Orchid/Okano/Wearnes/TXC/CyDROM CDROM support CONFIG_AZTCD This is your driver if you have an Aztech CDA268-01A, Orchid CD-3110, Okano or Wearnes CDD110, Conrad TXC, or CyCDROM CR520 or CR540 CDROM drive. This driver - just like all these CDROM drivers - is NOT for CDROM drives with IDE/ATAPI interfaces, such as Aztech CDA269-031SE. Please read the file Documentation/cdrom/aztcd. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called aztcd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Sony CDU535 CDROM support CONFIG_CDU535 This is the driver for the older Sony CDU-535 and CDU-531 CDROM drives. Please read the file Documentation/cdrom/sonycd535. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sonycd535.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Goldstar R420 CDROM support CONFIG_GSCD If this is your CDROM drive, say Y here. As described in linux/Documentation/cdrom/gscd, you might have to change a setting in the file linux/drivers/cdrom/gscd.h before compiling the kernel. Please read the file Documentation/cdrom/gscd. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called gscd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Philips/LMS CM206 CDROM support CONFIG_CM206 If you have a Philips/LMS CDROM drive cm206 in combination with a cm260 host adapter card, say Y here. Please also read the file Documentation/cdrom/cm206. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called cm206.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Optics Storage DOLPHIN 8000AT CDROM support CONFIG_OPTCD This is the driver for the 'DOLPHIN' drive with a 34-pin Sony compatible interface. It also works with the Lasermate CR328A. If you have one of those, say Y. This driver does not work for the Optics Storage 8001 drive; use the IDE-ATAPI CDROM driver for that one. Please read the file Documentation/cdrom/optcd. If you say Y here, you should also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called optcd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Sanyo CDR-H94A CDROM support CONFIG_SJCD If this is your CDROM drive, say Y here and read the file Documentation/cdrom/sjcd. You should then also say Y to "ISO9660 cdrom filesystem support" below, because that's the filesystem used on CDROMs. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called sjcd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Soft configurable cdrom interface card support CONFIG_CDI_INIT If you want to include boot-time initialization of any cdrom interface card that is software configurable, say Y here. Currently only the ISP16/MAD16/Mozart sound cards with built-in cdrom interfaces are supported. Note that the answer to this question doesn't directly affect the kernel: saying N will just cause this configure script to skip all the questions about these CDROM drives. ISP16/MAD16/Mozart soft configurable cdrom interface support CONFIG_ISP16_CDI These are sound cards with with built-in cdrom interfaces using the OPTi 82C928 or 82C929 chips. Say Y here to have them detected and possibly configured at boot time. In addition, You'll have to say Y to a driver for the particular cdrom drive you have attached to the card. Read Documentation/cdrom/isp16 for details. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called isp16.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Preload dcache CONFIG_DCACHE_PRELOAD Preloading will create dcache entries when a directory is scanned (e.g. because the ls command was used) for the *first* time. This should speed up successive lookups of information about files in that directory, but can also consume large amounts of memory. Please report speedups (or slowdowns due to the memory usage if they occur) to schoebel@informatik.uni-stuttgart.de . If unsure, say N. Quota support CONFIG_QUOTA If you say Y here, you will be able to set per user limits for disk usage (also called disk quotas). Currently, it works only for the ext2 filesystem. You need additional software in order to use quota support; for details, read the Quota mini-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini. Probably the quota support is only useful for multi user systems. If unsure, say N. Online mirror support CONFIG_OMIRR omirr is a package for _symmetric_ mirroring of files over the Internet. In contrast to rdist, the online mirror daemon (omirrd) is running all the time and transfers any changes on the file system as soon as possible to all other servers. Symmetric means that all servers have equal rights in changing a file: the last changer of a file will win. This is the same behaviour as multiple processes operating on a global file system. In effect, omirr can do the same as NFS mounts, but will have better performance since the data is stored on local disks. In contrast to a cache filesystem which has a dedicated master copy, broken connections and/or servers are no problem for continuing work on the remaining ones, because there is no master copy. Every computer that wants to participate in the mirroring needs to run the daemon omirrd, contained in the omirr package which is available via ftp (user: anonymous) from ftp://ftp.isa.de/pub/home/luik. You must say Y if you want to use in.omirrd, but you should (but need not) say N if you don't (for performance reasons). Note that this is experimental code; use at your own risk. Filename translation support CONFIG_TRANS_NAMES This is a useful feature if you have a pool of diskless Linux clients which mount their root filesystems from a central server. Depending on their hostnames, the clients can then see different versions of certain files, which keeps maintenance at a minimum when used for configuration files. The kernel running on the clients should have this option enabled. If you don't administer a pool of Linux clients, say N here, otherwise read on: When you say Y here, filenames, directory names etc become context-sensitive. If you have a file named "/etc/config#host=banana#", it will appear (by default) as hardlinked to "/etc/config" on host "banana", while on host "mango" another file "/etc/config#host=mango#" will appear as having been hardlinked to "/etc/config". This default behaviour can be changed by setting the _first_ environment variable NAMETRANS to a colon-separated list of suffixes which are tried in the specified order. For example, in 'env - NAMETRANS=#host=mango#:#ktype=diskless# "`env`" command ...' the command will see the same files as if it had been executed on host "mango" with a diskless kernel. Using NAMETRANS supersedes _all_ default translations. Thus translations can be completely switched off with an empty list, e.g. 'env - NAMETRANS= "`env`" command ...' Note that some system utilities like tar, dump, restore should be used with translation switched off, in order to avoid doubled space in archive files and when extracting from them. Also, make sure that nfsd, mountd (and similar ones like samba daemons) run without translation, in order to avoid doubled (or even wrong) translation at the server and at the client. You can automatically force the creation of context-dependent filenames if there exists a template filename like "/etc/mtab#host=CREATE#". As soon as a process running on "mango" tries to create a file "/etc/mtab", the version "/etc/mtab#host=mango#" is created instead (which appears in turn as hardlinked to "/etc/mtab"). Note that if you want to make "/etc/fstab" context-dependent, you should execute "touch /etc/mtab#host=CREATE#" and "touch /etc/mtab.tmp#host=CREATE#", because mount, umount and others running on different hosts would otherwise try to create one shared /etc/mtab which would result in a clash. Also one should execute "touch /etc/nologin#host=CREATE#" to prevent global side effects from shutdown resp. runlevel. Please read Documentation/transname.txt if you intend to say Y here. Restrict translation to gid CONFIG_TRANS_RESTRICT If you say Y here, default filename translations are carried out only if the parent directory of the context-sensitive file belongs to a specific group id (gid). Trying to translate names everywhere will decrease performance of file openings. Normally translations are used only in system configuration files but not in ordinary user filespace. So you should change the gid of directories containing context-dependent files to some special group like "adm" (group id 4) and enable this option. As a result, users will not notice any performance degradation resulting from filename translation. Note that translations resulting from the first environment variable "NAMETRANS=..." are always carried out regardless of the gid of directories. Beware: before turning on this option make sure that all directories containing context-dependent files belong to the special group, or system initialization may fail. If unsure, select N. Group id (gid) for translation restriction CONFIG_TRANS_GID Default name translations will be carried out only inside directories belonging to the group id (gid) that you specify here. Default is 4 (group "adm"). Nodename (hostname) translation CONFIG_TR_NODENAME Enables translation of name suffixes like in "/etc/config#host=banana#". The syntax is #host=#. The hostname can be queried with the command "uname -n". Normally this option is used heavily when translation is enabled. If unsure, say Y. Kernelname translation CONFIG_TR_KERNNAME Enables translation of name suffixes like in "/etc/config#kname=default#". The string is hard compiled into the kernel by the following option. Useful if your kernel does not know the hostname at boot time, and there is no way to tell the hostname by lilo or bootp. Please avoid using this option and prefer "Nodename (hostname) translation" (CONFIG_TR_NODENAME) wherever possible. When mounting the root over NFS, the own hostname must be known at boot time anyway; this option is just for special use. Note that the default translations are tried in the order as occurring in the configuration, that is 1) host 2) kname 3) ktype 4) machine 5) system. If unsure, say Y. String for kernelname translation CONFIG_KERNNAME Enter the string you want to compile into the kernel. The string will be used as context in context-dependent files like "/etc/config#kname=#". Kerneltype translation CONFIG_TR_KERNTYPE Enables translation of name suffixes like in "/etc/config#ktype=default#". The syntax is #ktype=#. The string is hard compiled in the kernel by the following option. Use if you want to create different kernels with different behaviour. For example, use the string "default" on your server, and use "diskless" on all your diskless clients (and perhaps "dataless" on dataless clients). This way you can avoid dozens of "config#host=# with same contents and you have no effort when new machines are added. If unsure, say Y. String for kerneltype translation CONFIG_KERNTYPE Enter the string you want to compile into the kernel. The string will be used as context in context-dependent files like "/etc/config#ktype=default#". If your kernel is to be used on a server, you probably can use "default" here. If your kernel is intended for a diskless client, you probably should enter "diskless" here. Machine type translation CONFIG_TR_MACHINE Enables translation of name suffixes like in "/etc/config#machine=i486#". The syntax is #machine=#. The machine types can be queried with the command "uname -m". Normally used only on multi-architecture installations. If unsure, say Y. System name translation CONFIG_TR_SYSNAME Enables translation of name suffixes like in "/etc/config#system=Linux#". The syntax is #system=#. The system name can be queried with the command "uname -s". Currently only supported by Linux, but hopefully other operating systems will pick up the idea of context-dependent translations. If unsure, say Y. Minix fs support CONFIG_MINIX_FS Minix is a simple operating system used in many classes about OS's. The minix filesystem (= method to organize files on a hard disk partition or a floppy disk) was the original filesystem for Linux, has been superseded by the second extended filesystem ext2fs but is still used for root/boot and other floppies or ram disks since it is leaner. You don't want to use it on your hard disk because of certain built-in restrictions. This option will enlarge your kernel by about 25 kB. Everyone should say Y or M so that they are able to read this common floppy format. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called minix.o. Note that the filesystem of your root partition cannot be compiled as a module. Second extended fs support CONFIG_EXT2_FS This is the de facto standard Linux filesystem (= method to organize files on a storage device) for hard disks. You want to say Y, unless you intend to use Linux exclusively from inside a DOS partition using the umsdos filesystem. The advantage of the latter is that you can get away without repartitioning your hard drive (which often implies backing everything up and restoring afterwards); the disadvantage is that Linux becomes susceptible to DOS viruses and that umsdos is somewhat slower than ext2fs. Even if you want to run Linux in this fashion, it might be a good idea to have ext2fs around: it enables you to read more floppy disks and facilitates the transition to a *real* Linux partition later. Another (rare) case which doesn't require ext2fs is a diskless Linux box which mounts all files over the network using NFS (in this case it's sufficient to say Y to "NFS filesystem support" below). Saying Y here will enlarge your kernel by about 41 kB. The Ext2fs-Undeletion mini-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini, gives information about how to retrieve deleted files on ext2fs filesystems. To change the behavior of ext2fs filesystems, you can use the tune2fs utility ("man tune2fs"). If you want to compile this filesystem as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ext2.o. Be aware however that the filesystem of your root partition cannot be compiled as a module, and so this could be dangerous. Most everyone wants to say Y here. ISO9660 cdrom filesystem support CONFIG_ISO9660_FS This is the standard filesystem used on CDROMs. It was previously known as "High Sierra Filesystem" and is called "hsfs" on other Unix systems. The so-called Rock-Ridge extensions which allow for long Unix filenames and symbolic links are also supported by this driver. If you have a CDROM drive and want to do more with it than just listen to audio CDs and watch its LEDs, say Y (and read Documentation/filesystems/isofs.txt and the CDROM-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO), thereby enlarging your kernel by about 27 kB; otherwise say N. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called isofs.o. Microsoft Joliet cdrom extensions CONFIG_JOLIET Joliet is a Microsoft extension for the ISO9660 CDROM filesystem which allows for long filenames in unicode format (unicode is the new 16 bit character code, successor to ASCII, which encodes the characters of almost all languages of the world; see http://www.unicode.org for more information; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Say Y here if you want to be able to read Joliet CDROMs under Linux. fat fs support CONFIG_FAT_FS If you want to use one of the FAT-based filesystems (the MS-DOS, VFAT (Windows 95) and UMSDOS (used to run Linux on top of an ordinary DOS partition) filesystems), then you must include FAT support. This is not a filesystem in itself, but it provides the foundation for the other filesystems. It is now also becoming possible to read and write compressed FAT filesystems; read Documentation/filesystems/fat_cvf.txt for details. This option will enlarge your kernel by about 24 kB. If unsure, say Y. If you want to compile this as a module however ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called fat.o. Note that if you compile the FAT support as a module, you cannot compile any of the FAT-based filesystems into the kernel - they will have to be modules as well. The filesystem of your root partition cannot be a module, so don't say M here if you intend to use UMSDOS as your root filesystem. msdos fs support CONFIG_MSDOS_FS This allows you to mount MSDOS partitions of your hard drive (unless they are compressed; to access compressed MSDOS partitions under Linux, you can either use the DOS emulator DOSEMU, described in the DOSEMU-HOWTO, available via ftp (user: anonymous) at ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO, or try dmsdosfs in ftp://sunsite.unc.edu/pub/Linux/system/filesystems/dosfs. If you intend to use dosemu with a non-compressed MSDOS partition, say Y here) and MSDOS floppies. This means that file access becomes transparent, i.e. the MSDOS files look and behave just like all other Unix files. Another way to read and write MSDOS floppies from within Linux (but not transparently) is with the mtools ("man mtools") program suite, which doesn't require the msdos filesystem support. If you want to use umsdos, the Unix-like filesystem on top of DOS, which allows you to run Linux from within a DOS partition without repartitioning, you'll have to say Y or M here. If you have Windows 95 or Windows NT installed on your MSDOS partitions, you should use the VFAT filesystem instead, or you will not be able to see the long filenames generated by Windows 95 / Windows NT. This option will enlarge your kernel by about 7 kB. If unsure, say Y. This will only work if you said Y to "fat fs support" as well. If you want to compile this as a module however ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called msdos.o. vfat fs support CONFIG_VFAT_FS This allows you to mount MSDOS partitions of your hard drive. It will let you use filenames in a way compatible with the long filenames used by Windows 95 and Windows NT fat-based (not NTFS) partitions. It does not support Windows 95 compressed filesystems. You cannot use the VFAT filesystem for your root partition; use UMSDOS instead. This option enlarges your kernel by about 10 kB and it only works if you said Y to the "fat fs support" above. Please read the file Documentation/filesystems/vfat.txt for details. If unsure, say N. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called vfat.o. umsdos: Unix like fs on top of std MSDOS fs CONFIG_UMSDOS_FS Say Y here if you want to run Linux from within an existing DOS partition of your hard drive. The advantage of this is that you can get away without repartitioning your hard drive (which often implies backing everything up and restoring afterwards) and hence you're able to quickly try out Linux or show it to your friends; the disadvantage is that Linux becomes susceptible to DOS viruses and that UMSDOS is somewhat slower than ext2fs. Another use of umsdos is to write files with long unix filenames to MSDOS floppies; it also allows unix style softlinks and owner/permissions of files on MSDOS floppies. You will need a program called umssync in order to make use of umsdos; read Documentation/filesystems/umsdos.txt. This option enlarges your kernel by about 25 kB and it only works if you said Y to both "fat fs support" and "msdos fs support" above. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called umsdos.o. Note that the filesystem of your root partition cannot be a module, so this could be dangerous. If unsure, say N. /proc filesystem support CONFIG_PROC_FS This is a virtual filesystem providing information about the status of the system. "Virtual" means that it doesn't take up any space on your hard disk: the files are created on the fly by the kernel when you try to access them. Also, you cannot read the files with older version of the program less: you need to use more or cat. The filesystem is explained in the Kernel Hacker's Guide at http://www.redhat.com:8080/HyperNews/get/khg.html on the WWW (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape), and also on the proc(8) manpage ("man 8 proc"). It's totally cool; for example, "cat /proc/interrupts" gives information about what the different IRQs are used for at the moment (there is a small number of Interrupt ReQuest lines in your computer that are used by the attached devices to gain the CPU's attention - often a source of trouble if two devices are mistakenly configured to use the same IRQ). This option will enlarge your kernel by about 18 kB. Several programs depend on this, so everyone should say Y here. NFS filesystem support CONFIG_NFS_FS If you are connected to some other (usually local) Unix computer (using SLIP, PLIP, PPP or Ethernet) and want to mount files residing on that computer (the NFS server) using the Network File Sharing protocol, say Y. "Mounting files" means that the client can access the files with usual UNIX commands as if they were sitting on the client's hard disk. For this to work, the server must run the programs nfsd and mountd (but does not need to have NFS filesystem support enabled in its kernel). NFS is explained in the Network Administrator's Guide, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/LDP, on its man page: "man nfs", and in the NFS-HOWTO. If you say Y here, you should have said Y to TCP/IP networking also. This option would enlarge your kernel by about 27 kB. This filesystem is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called nfs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If you are configuring a diskless machine which will mount its root filesystem over NFS (in order to do that, check out the netboot package, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/system/boot/ethernet/, extract with "tar xzvf filename", and say Y to "Root file system on NFS" and to "IP: kernel level autoconfiguration"), then you cannot compile this driver as a module. If you don't know what all this is about, say N. Root file system on NFS CONFIG_ROOT_NFS If you want your Linux box to mount its whole root filesystem from some other computer over the net via NFS (presumably because your box doesn't have a hard disk), say Y. Read Documentation/nfsroot.txt for details. It is likely that in this case, you also want to say Y to "IP: kernel level autoconfiguration" so that your box can discover its network address at boot time. Most people say N here. NFS server support CONFIG_NFSD If you want your Linux box to act as a NFS *server*, so that other computers on your local network which support NFS can access certain directories on your box transparently, you have two options: you can use the self-contained user space program nfsd, in which case you should say N here, or you can say Y and use this new experimental kernel based NFS server. The advantage of the kernel based solution is that it is faster; it might not be completely stable yet, though. You will need the support software from the linux-nfs package available at ftp://ftp.mathematik.th-darmstadt.de/pub/linux/okir/. Please read the NFS-HOWTO, available via ftp (user: anonymous) from sunsite.unc.edu:/pub/Linux/docs/HOWTO. The NFS server is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called nfsd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say N. OS/2 HPFS filesystem support (read only) CONFIG_HPFS_FS OS/2 is IBM's operating system for PC's, the same as Warp, and HPFS is the filesystem used for organizing files on OS/2 hard disk partitions. Say Y if you want to be able to read files from an OS/2 HPFS partition of your hard drive. OS/2 floppies however are in regular MSDOS format, so you don't need this option in order to be able to read them. Read Documentation/filesystems/hpfs.txt. This filesystem is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called hpfs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say N. Windows NT NTFS support (read only) CONFIG_NTFS_FS NTFS is the file system of Microsoft Windows NT. Say Y if you want to get read access to files on NTFS partitions of your hard drive. The Linux NTFS driver supports most of the mount options of the VFAT driver, see Documentation/filesystems/ntfs.txt. Saying Y here will give you read-only access to NTFS partitions. This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called ntfs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. NTFS read-write support (experimental) CONFIG_NTFS_RW If you say Y here, you will (hopefully) be able to write to NTFS file systems as well as to read from them. The read-write support in NTFS is far from being complete and is not well tested. If you enable this, be prepared to recover the NTFS volume from tape. If unsure, say N. System V and Coherent filesystem support CONFIG_SYSV_FS SCO, Xenix and Coherent are commercial Unix systems for Intel machines. Saying Y here would allow you to read and write to and from their floppies and hard disk partitions. If you have a floppy or hard disk partition like that, it is likely that they contain binaries from those other Unix systems; in order to run these binaries, you will want to install iBCS2 (iBCS2 [Intel Binary Compatibility Standard] is a kernel module which lets you run SCO, Xenix, Wyse, UnixWare, Dell Unix and System V programs under Linux and is often needed to run commercial software that's only available for those systems. It's available via ftp (user: anonymous) from ftp://tsx-11.mit.edu/pub/linux/BETA). If you only intend to mount files from some other Unix over the network using NFS, you don't need the System V filesystem support (but you need NFS filesystem support obviously). Note that this option is generally not needed for floppies, since a good portable way to transport files and directories between unixes (and even other operating systems) is given by the tar program ("man tar" or preferably "info tar"). Note also that this option has nothing whatsoever to do with the option "System V IPC". Read about the System V filesystem in Documentation/filesystems/sysv-fs.txt. This option will enlarge your kernel by about 34 kB. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called sysv.o. If you haven't heard about all of this before, it's safe to say N. Amiga FFS filesystem support CONFIG_AFFS_FS The Fast File System (FFS) is the common filesystem used on hard disks by Amiga(tm) Systems since AmigaOS Version 1.3 (34.20). With this driver you can also mount diskfiles used by Bernd Schmidt's Un*X Amiga Emulator (http://www.freiburg.linux.de/~uae/; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). If you want to do the latter, you will also need to say Y to "Loop device support", above. Say Y if you want to be able to read and write files from and to an Amiga FFS partition on your hard drive. Amiga floppies however cannot be read with this driver due to an incompatibility of the floppy controller used in an Amiga and the standard floppy controller in PCs and workstations. Read Documentation/filesystems/affs.txt and fs/affs/Changes. This filesystem is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called affs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If unsure, say N. Apple Macintosh filesystem support (experimental) CONFIG_HFS_FS If you say Y here, you will be able to mount Macintosh-formatted floppy disks and hard drive partitions with full read-write access. Please read fs/hfs/HFS.txt to learn about the available mount options. This filesystem support is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called hfs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. ROM filesystem support CONFIG_ROMFS_FS This is a very small read-only filesystem mainly intended for initial ram disks of installation disks, but it could be used for other read-only media as well. Read Documentation/filesystems/romfs.txt for details. This filesystem support is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called romfs.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. If you don't know whether you need it, then you don't need it: say N. Kernel automounter support CONFIG_AUTOFS_FS The automounter is a tool to automatically mount remote filesystems on demand. This implementation is partially kernel-based to reduce overhead in the already-mounted case; this is unlike the BSD automounter (amd), which is only in user space. To use the automounter you need the user-space tools from ftp://ftp.kernel.org/pub/linux/daemons/autofs; you also want to say Y to "NFS filesystem support", above. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called autofs.o. If you are not a part of a fairly large, distributed network, you probably do not need an automounter, and can say N here. BSD UFS filesystem support (read only) CONFIG_UFS_FS BSD and derivate versions of Unix (such as SunOS, FreeBSD, NetBSD, OpenBSD and NeXTstep) use a filesystem called UFS. Some System V Unixes can create and mount hard disk partitions and diskettes using this filesystem as well. Saying Y here allows you to mount these partitions and diskettes read-only. If you only intend to mount files from some other Unix over the network using NFS, you don't need the UFS filesystem support (but you need NFS filesystem support obviously). Note that this option is generally not needed for floppies, since a good portable way to transport files and directories between unixes (and even other operating systems) is given by the tar program ("man tar" or preferably "info tar"). When accessing NeXTstep files, you may need to convert them from the NeXT character set to the Latin1 character set; use the program recode ("info recode") for this purpose. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ufs.o. If you haven't heard about all of this before, it's safe to say N. BSD disklabel (FreeBSD partition tables) support CONFIG_BSD_DISKLABEL FreeBSD uses its own hard disk partition scheme on your PC. It requires only one entry in the primary partition table of your disk and manages it similarly to DOS extended partitions, putting in its first sector a new partition table in disklabel format. Saying Y here allows you to read these disklabels and further mount FreeBSD partitions read-only from within Linux if you have also said Y to "BSD ufs filesystem support", above. If you don't know what all this is about, say N. SMD disklabel (Sun partition tables) support CONFIG_SMD_DISKLABEL Like most systems, SunOS uses its own hard disk partition table format, incompatible with all others. Saying Y here allows you to read these partition tables and further mount SunOS disks read-only from within Linux if you have also said Y to "BSD ufs filesystem support", above. This is mainly used to carry data from a Sparc under SunOS to your Linux box via a removable medium like magneto-optical or ZIP drives; note however that a good portable way to transport files and directories between unixes (and even other operating systems) is given by the tar program ("man tar" or preferably "info tar"). If you don't know what all this is about, say N. Solaris (x86) partition table support CONFIG_SOLARIS_X86_PARTITION Like most systems, Solaris x86 uses its own hard disk partition table format, incompatible with all others. Saying Y here allows you to read these partition tables and further mount Solaris x86 disks read-only from within Linux if you have also said Y to "BSD ufs filesystem support", above. ADFS filesystem support (read only) (EXPERIMENTAL) CONFIG_ADFS_FS Acorn Disc Filing System is the standard filesystem of the Risc OS operating system which runs on Acorn's ARM based Risc PC computers. If you say Y here, Linux will be able to read from ADFS partitions on hard drives and from ADFS-formatted floppy disks. This code is also available as a module called adfs.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. /dev/pts filesystem (experimental) CONFIG_DEVPTS_FS If you say Y here, you'll get a virtual filesystem which can be mounted on /dev/pts with "mount -t devpts". This, together with the pseudo terminal master multiplexer /dev/ptmx is used for pseudo terminal support as described in the Open Group's Unix98 standard: in order to acquire a pseudo terminal, a process opens /dev/ptmx; the number of the pseudo terminal is then made available to the process and the pseudo terminal slave can be accessed as /dev/pts/. What was traditionally /dev/ttyp2 will then be /dev/pts/2, for example. The GNU C library glibc 2.1 contains the requisite support for this mode of operation. This code is also available as a module called devpts.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Macintosh partition map support CONFIG_MAC_PARTITION Say Y here if you want your Linux system to be able to read the partition tables of Macintosh hard drives, and thus use partitions on those drives. SMB filesystem support (to mount WfW shares etc..) CONFIG_SMB_FS SMB (Server Message Block) is the protocol Windows for Workgroups (WfW), Windows 95, Windows NT and Lan Manager use to share files and printers over local networks. Saying Y here allows you to mount their filesystems (often called "shares" in this context) and access them just like any other unix directory. Currently, this works only if the Windows machines use TCP/IP as the underlying transport protocol, and not Netbeui. For details, read Documentation/filesystems/smbfs.txt and the SMB-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. Note: if you just want your box to act as an SMB *server* and make files and printing services available to Windows clients (which need to have a TCP/IP stack), you don't need to say Y here; you can use the program samba (available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/system/network/samba) for that. General information about how to connect Linux, Windows machines and Macs is on the WWW at http://www.eats.com/linux_mac_win.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). If you want to compile the SMB support as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called smbfs.o. Most people say N, however. SMB Win95 bug work-around CONFIG_SMB_WIN95 If you want to connect to a share exported by Windows 95, you should say Y here. The Windows 95 server contains a bug that makes listing directories unreliable. This option slows down the listing of directories. This makes the Windows 95 server a bit more stable. Coda filesystem support CONFIG_CODA_FS Coda is an advanced network filesystem, similar to NFS in that it enables you to mount filesystems of a remote server and access them with regular Unix commands as if they were sitting on your hard disk. Coda has several advantages over NFS: support for disconnected operation for laptops, read/write server replication, security model for authentication and encryption, persistent client caches and write back caching. If you say Y here, your Linux box will be able to act as a Coda *client*. You will need user level code as well, both for the client and server. Servers are currently user level, i.e. need no kernel support. For technical information, read Documentation/filesystems/coda.txt. For further information see http://www.coda.cs.cmu.edu (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) or contact Peter Braam . If you want to compile the coda client support as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called coda.o. NCP filesystem support (to mount NetWare volumes) CONFIG_NCP_FS NCP (NetWare Core Protocol) is a protocol that runs over IPX and is used by Novell NetWare clients to talk to file servers. It is to IPX what NFS is to TCP/IP, if that helps. Saying Y here allows you to mount NetWare file server volumes and to access them just like any other Unix directory. For details, please read the file Documentation/filesystems/ncpfs.txt in the kernel source and the IPX-HOWTO on sunsite.unc.edu:/pub/Linux/docs/howto. You do not have to say Y here if you want your Linux box to act as a file *server* for Novell NetWare clients. General information about how to connect Linux, Windows machines and Macs is on the WWW at http://www.eats.com/linux_mac_win.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called ncpfs.o. Say N unless you are connected to a Novell network. Packet signatures CONFIG_NCPFS_PACKET_SIGNING NCP allows packets to be signed for stronger security. If you want security, say Y. Normal users can leave it off. To be able to use packet signing you must use ncpfs > 2.0.12. Proprietary file locking CONFIG_NCPFS_IOCTL_LOCKING Allows locking of records on remote volumes. Say N unless you have special applications which are able to utilize this locking scheme. Clear remove/delete inhibit when needed CONFIG_NCPFS_STRONG Allows manipulation of files flagged as Delete or Rename Inhibit. To use this feature you must mount volumes with the ncpmount parameter "-s" (ncpfs-2.0.12 and newer). Say Y unless you are not mounting volumes with -f 444. Use NFS namespace when available CONFIG_NCPFS_NFS_NS Allows you to utilize NFS namespace on NetWare servers. It brings you case sensitive filenames. Say Y. You can disable it at mount-time with the `-N nfs' parameter of ncpmount. Use OS2/LONG namespace when available CONFIG_NCPFS_OS2_NS Allows you to utilize OS2/LONG namespace on NetWare servers. Filenames in this namespace are limited to 255 characters, they are case insensitive, and case in names is preserved. Say Y. You can disable it at mount time with the -N os2 parameter of ncpmount. Allow mounting of volume subdirectories CONFIG_NCPFS_MOUNT_SUBDIR Allows you to mount not only whole servers or whole volumes, but also subdirectories from a volume. It can be used to reexport data and so on. There is no reason to say N, so Y is recommended unless you count every byte. To utilize this feature you must use ncpfs-2.0.12 or newer. NDS interserver authentication domains CONFIG_NCPFS_NDS_DOMAINS This allows storing NDS private keys in kernel space where they can be used to authenticate another server as interserver NDS accesses need it. You must use ncpfs-2.0.12.1 or newer to utilize this feature. Say Y if you are using NDS connections to NetWare servers. Do not say Y if security is primary for you because root can read your session key (from /proc/kcore). nls: Native language codepages and Unicode support CONFIG_NLS This is required by the FAT and NTFS filesystems and by the ISO9660 filesystem when it is compiled with Joliet support. Joliet is a Microsoft extension for CDROMs that supports Unicode. This allows translation between different character sets. When dealing with the FAT based filesystems, there are two character sets that are important. The first is the codepage. Codepages are character sets that are used by DOS to allow filenames to have native language characters when character sets were limited to 256 characters. The codepage is the character set that is used to store native language characters on disk. The two most common codepages are 437 in the United States and 850 in much of Europe. The second important character set is the input/output character set. This is the character set that is displayed on the screen. In the United States, this will almost always be the ISO 8859-1 character set. This is the default. Linux will only translate the FAT filenames, not the contents of the files. nls codepage 437 CONFIG_NLS_CODEPAGE_437 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage that is used in the United States and parts of Canada. This is recommended. nls codepage 737 CONFIG_NLS_CODEPAGE_737 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage that is used for Greek. If unsure, say N. nls codepage 775 CONFIG_NLS_CODEPAGE_775 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage that is used for the Baltic Rim Languages. If unsure, say N. nls codepage 850 CONFIG_NLS_CODEPAGE_850 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage that is used for much of Europe--United Kingdom, Germany, Spain, Italy, and [add more countries here]. It has some characters useful to many European languages that are not part of the US codepage 437. If unsure, say Y. nls codepage 852 CONFIG_NLS_CODEPAGE_852 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the Latin 2 codepage used by DOS for much of Central and Eastern Europe. It has all the required characters for these languages: Albanian, Croatian, Czech, English, Finnish, Hungarian, Irish, German, Polish, Romanian, Serbian (Latin transcription), Slovak, Slovenian, and Sorbian. nls codepage 855 CONFIG_NLS_CODEPAGE_855 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Cyrillic. nls codepage 857 CONFIG_NLS_CODEPAGE_857 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Turkish. nls codepage 860 CONFIG_NLS_CODEPAGE_860 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Portuguese. nls codepage 861 CONFIG_NLS_CODEPAGE_861 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Icelandic. nls codepage 862 CONFIG_NLS_CODEPAGE_862 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Hebrew. nls codepage 863 CONFIG_NLS_CODEPAGE_863 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Canadian French. nls codepage 864 CONFIG_NLS_CODEPAGE_864 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Arabic. nls codepage 865 CONFIG_NLS_CODEPAGE_865 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for the Nordic European countries. nls codepage 866 CONFIG_NLS_CODEPAGE_866 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Cyrillic/Russian. nls codepage 869 CONFIG_NLS_CODEPAGE_869 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Greek. ### ### Why do we have two codepages for Greek and Cyrillic? ### nls codepage 874 CONFIG_NLS_CODEPAGE_874 The Microsoft fat filesystem family can deal with filenames in native language character sets. These character sets are stored in so-called DOS codepages. You need to include the appropriate codepage if you want to be able to read/write these filenames on DOS/Windows partitions correctly. This does apply to the filenames only, not to the file contents. You can include several codepages; say Y here if you want to include the DOS codepage for Thai. nls iso8859-1 CONFIG_NLS_ISO8859_1 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the Latin 1 character set, which covers most West European languages such as Albanian, Catalan, Danish, Dutch, English, Faeroese, Finnish, French, German, Galician, Irish, Icelandic, Italian, Norwegian, Portuguese, Spanish, Swedish, and Valencian. It is also the default for the US. If unsure, say Y. nls iso8859-2 CONFIG_NLS_ISO8859_2 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the the Latin 2 character set, which works for most Latin-written Slavic and Central European languages: Czech, German, Hungarian, Polish, Rumanian, Croatian, Slovak, Slovene. nls iso8859-3 CONFIG_NLS_ISO8859_3 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the Latin 3 character set, which is popular with authors of Esperanto, Galician, Maltese, and Turkish. nls iso8859-4 CONFIG_NLS_ISO8859_4 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the Latin 4 character set which introduces letters for Estonian, Latvian, and Lithuanian. It is an incomplete predecessor of Latin 6. nls iso8859-5 CONFIG_NLS_ISO8859_5 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for ISO8859-5, a Cyrillic character set with which you can type Bulgarian, Byelorussian, Macedonian, Russian, Serbian, and Ukrainian. Note that the charset KOI8-R is preferred in Russia. nls iso8859-6 CONFIG_NLS_ISO8859_6 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for ISO8859-6, the Arabic character set. nls iso8859-7 CONFIG_NLS_ISO8859_7 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for ISO8859-7, the Modern Greek character set. nls iso8859-8 CONFIG_NLS_ISO8859_8 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for ISO8859-8, the Hebrew character set. nls iso8859-9 CONFIG_NLS_ISO8859_9 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the Latin 5 character set, and it replaces the rarely needed Icelandic letters in Latin 1 with the Turkish ones. Useful in Turkey. nls iso8859-10 CONFIG_NLS_ISO8859_10 If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the Latin 6 character set, which adds the last Inuit (Greenlandic) and Sami (Lappish) letters that were missing in Latin 4 to cover the entire Nordic area. nls koi8-r CONFIG_NLS_KOI8_R If you want to display filenames with native language characters from the Microsoft fat filesystem family or from JOLIET CDROMs correctly on the screen, you need to include the appropriate input/output character sets. Say Y here for the preferred Russian character set. Virtual terminal CONFIG_VT This includes support for a terminal device with display and keyboard devices. Only people using embedded systems want to say N here; most everybody else says Y. If unsure, say Y, or else you won't be able to do much with your new shiny Linux system :-) Support for console on virtual terminal CONFIG_VT_CONSOLE If you say Y here, by default all kernel messages will be sent to the device /dev/tty0 which corresponds to the virtual terminal you have visible on your display. You should say Y here unless you only want to have the kernel messages output on a serial port (in which case you probably want to say Y to "Console on serial port", below). Software generated cursor CONFIG_SOFTCURSOR If you say Y here, you'll be able to do lots of nice things with the cursors of your virtual consoles -- for example turn them into non-blinking block cursors which are more visible on laptop screens, or change their color depending on the virtual console you're on. See Documentation/VGA-softcursor.txt for more information. Standard/generic serial support CONFIG_SERIAL This selects whether you want to include the driver for the standard serial ports. The standard answer is Y. People who might say N here are those that are setting up dedicated Ethernet WWW/ftp servers, or users that have one of the various bus mice instead of a serial mouse and don't intend to use their machine's standard serial port for anything. (Note that the Cyclades and Stallion multi serial port drivers do not need this driver built in for them to work.) If you want to compile this driver as a module, say M here and read Documentation/modules.txt. The module will be called serial.o. [WARNING: Do not compile this driver as a module if you are using non-standard serial ports, since the configuration information will be lost when kerneld automatically unloads the driver. This limitation may be lifted in the future.] BTW: If you have a mouseman serial mouse which is not recognized by the X window system, try running gpm first. Most people will say Y or M here, so that they can use serial mice, modems and similar devices connecting to the standard serial ports. Support for console on serial port CONFIG_SERIAL_CONSOLE If you say Y here, it is possible to use a serial port as the console. By default still the currently visible virtual console will be used as the system console but you can alter that using a kernel command line option such as "console=ttyS1". (Try "man bootparam" or see the documentation of your boot loader (lilo or loadlin) about how to pass options to the kernel at boot time. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO.) If you don't have a VGA card installed and you say Y here, the kernel will automatically use /dev/ttyS0 as system console. Comtrol Rocketport support CONFIG_ROCKETPORT This is a driver for the Comtrol Rocketport cards which provide multiple serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. If you want to compile this driver as a module, say M here and read Documentation/modules.txt. The module will be called rocket.o. Digiboard Intelligent async support CONFIG_DIGIEPCA This is a driver for Digi International's Xx, Xeve, and Xem series of cards which provide multiple serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. This driver supports the original PC (ISA) boards as well as PCI, and EISA. If you have a card like this, say Y here and read the file Documentation/digiepca.txt. NOTE: There is another, separate driver for the Digiboard PC boards: "Digiboard PC/Xx Support" below. You should (and can) only select one of the two drivers. If you want to compile this driver as a module, say M here and read Documentation/modules.txt. The module will be called epca.o. Digiboard PC/Xx Support CONFIG_DIGI This is a driver for the Digiboard PC/Xe, PC/Xi, and PC/Xeve cards that give you many serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. If you have a card like that, say Y here and read the file Documentation/digiboard.txt. If you want to compile this driver as a module, say M here and read Documentation/modules.txt. The module will be called pcxx.o. SDL RISCom/8 card support CONFIG_RISCOM8 This is a driver for the SDL Communications RISCom/8 multiport card, which gives you many serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. If you have a card like that, say Y here and read the file Documentation/riscom8.txt. Also it's possible to say M here and compile this driver as kernel loadable module; the module will be called riscom8.o. Specialix IO8+ card support CONFIG_SPECIALIX This is a driver for the Specialix IO8+ multiport card, that give you many serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. If you have a card like that, say Y here and read the file Documentation/specialix.txt. Also it's possible to say M here and compile this driver as kernel loadable module which will be called specialix.o. Specialix DTR/RTS pin is RTS CONFIG_SPECIALIX_RTSCTS The Specialix card can only support either RTS or DTR. When you say N here, the driver will use the pin as "DTR" when the tty is in software handshake mode. When you say Y here or hardware handshake is on, it will always be RTS. Read the file Documentation/specialix.txt for more information. Cyclades async mux support CONFIG_CYCLADES This is a driver for a card that gives you many serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. For information about the Cyclades-Z card, read drivers/char/README.cycladesZ. As of 1.3.9x kernels, this driver's minor numbers start at 0 instead of 32. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called cyclades.o. If you haven't heard about it, it's safe to say N. Stallion multiport serial support CONFIG_STALDRV Stallion cards give you many serial ports. You would need something like this to connect more than two modems to your Linux box, for instance in order to become a BBS. If you say Y here, you will be asked for your specific card model in the next questions. Make sure to read drivers/char/README.stallion in this case. If you have never heard about all this, it's safe to say N. Stallion EasyIO or EC8/32 support CONFIG_STALLION If you have an EasyIO or EasyConnection 8/32 multiport Stallion card, then this is for you; say Y. Make sure to read Documentation/stallion.txt. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called stallion.o. Stallion EC8/64, ONboard, Brumby support CONFIG_ISTALLION If you have an EasyConnection 8/64, ONboard, Brumby or Stallion serial multiport card, say Y here. Make sure to read Documentation/stallion.txt. To compile it as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called istallion.o. Hayes ESP serial port support CONFIG_ESPSERIAL This is a driver which supports Hayes ESP serial ports. It uses DMA to transfer data to and from the host. Make sure to read Documentation/hayes-esp.txt. To compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called esp.o. If unsure, say N. Hayes ESP serial port DMA channel CONFIG_ESPSERIAL_DMA_CHANNEL This is the DMA channel to be used to transfer data to and from the host. One DMA channel is shared between all the ESP ports. Valid values are 1 and 3. Hayes ESP serial port receive trigger level CONFIG_ESPSERIAL_RX_TRIGGER This is the trigger level (in bytes) of the receive FIFO. Larger values may result in fewer interrupts and hence better performance; however, a value too high could result in data loss. Valid values are 1 through 1023. Hayes ESP serial port transmit trigger level CONFIG_ESPSERIAL_TX_TRIGGER This is the trigger level (in bytes) of the transmit FIFO. Larger values may result in fewer interrupts and hence better performance; however, a value too high could result in degraded transmit performance. Valid values are 1 through 1023. Hayes ESP serial port flow off level CONFIG_ESPSERIAL_FLOW_OFF This is the level (in bytes) at which the ESP port will "flow off" the remote transmitter (i.e. tell him to stop stop sending more bytes). Valid values are 1 through 1023. This value should be greater than the receive trigger level and the flow on level. Hayes ESP serial port flow on level CONFIG_ESPSERIAL_FLOW_ON This is the level (in bytes) at which the ESP port will "flow on" the remote transmitter (i.e. tell him to resume sending bytes) after having flowed it off. Valid values are 1 through 1023. This value should be less than the flow off level, but greater than the receive trigger level. Hayes ESP serial port receiver timeout CONFIG_ESPSERIAL_RX_TMOUT This is the amount of time that the ESP port will wait after receiving the final character before signaling an interrupt. Valid values are 0 through 255. A value too high will increase latency, and a value too low will cause unnecessary interrupts. Parallel printer support CONFIG_PRINTER If you intend to attach a printer to the parallel port of your Linux box (as opposed to using a serial printer; if the connector at the printer has 9 or 25 holes ["female"], then it's serial), say Y. Also read the Printing-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. It is possible to share one parallel port among several devices (e.g. printer and ZIP drive) and it is safe to compile the corresponding drivers into the kernel. If you want to compile this driver as a module however ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called lp.o. If you have several parallel ports, you should specify the base address for the port to be used by the printer with the "lp" kernel command line option. (Try "man bootparam" or see the documentation of your boot loader (lilo or loadlin) about how to pass options to the kernel at boot time. The lilo procedure is also explained in the SCSI-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO.) The standard base addresses as well as the syntax of the "lp" command line option can be found in drivers/char/lp.c. If you have more than 3 printers, you need to increase the LP_NO variable in lp.c. Support IEEE1284 status readback CONFIG_PRINTER_READBACK If your printer conforms to IEEE 1284, it may be able to provide a status indication when you read from it (for example, with `cat /dev/lp1'). To use this feature, say Y here. Mouse Support (not serial mice) CONFIG_MOUSE This is for machines with a bus mouse or a PS/2 mouse as opposed to a serial mouse. Most people have a regular serial MouseSystem or Microsoft mouse (made by Logitech) that plugs into a COM port (rectangular with 9 or 25 pins). These people say N here. If you have something else, read the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO and say Y here. If you have a laptop, you either have to check the documentation or experiment a bit to find out whether the trackball is a serial mouse or not; it's best to say Y here for you. Note that the answer to this question won't directly affect the kernel: saying N will just cause this configure script to skip all the questions about non-serial mice. If unsure, say Y. Logitech busmouse support CONFIG_BUSMOUSE Logitech mouse connected to a proprietary interface card. It's generally a round connector with 9 pins. Note that the newer mice made by Logitech don't use the Logitech protocol anymore; for those, you don't need this option. You want to read the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called busmouse.o. If you are unsure, say N and read the HOWTO nevertheless: it will tell you what you have. PS/2 mouse (aka "auxiliary device") support CONFIG_PSMOUSE The PS/2 mouse connects to a special mouse port that looks much like the keyboard port (small circular connector with 6 pins). This way, the mouse does not use any serial ports. This port can also be used for other input devices like light pens, tablets, keypads. Compaq, AST and IBM all use this as their mouse port on currently shipping machines. The trackballs of some laptops are PS/2 mice also. In particular, the C&T 82C710 mouse on TI Travelmates is a PS/2 mouse. Although PS/2 mice are not technically bus mice, they are explained in detail in the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. When using a PS/2 mouse, you can get problems if you want to use the mouse both on the Linux console and under X. Using the "-R" option of the Linux mouse managing program gpm (available from sunsite.unc.edu:/pub/Linux/system/Daemons) solves this problem, or you can get the "mconv" utility also from sunsite. If you want to compile this mouse driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called psaux.o. If you are unsure, say N and read the HOWTO nevertheless: it will tell you what you have. C&T 82C710 mouse port support (as on TI Travelmate) CONFIG_82C710_MOUSE This is a certain kind of PS/2 mouse used on the TI Travelmate. If you are unsure, try first to say N here and come back if the mouse doesn't work. Read the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. PC110 digitizer pad support CONFIG_PC110_PAD This drives the digitizer pad on the IBM PC110 palmtop (see http://toy.cabi.net; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). It can turn the digitizer pad into a PS/2 mouse emulation with tap gestures or into an absolute pad. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called pc110pad.o. Microsoft busmouse support CONFIG_MS_BUSMOUSE These animals (also called Inport mice) are connected to an expansion board using a round connector with 9 pins. If this is what you have, say Y and read the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you are unsure, say N and read the HOWTO nevertheless: it will tell you what you have. Also be aware that several vendors talk about 'Microsoft busmouse' and actually mean PS/2 busmouse - so count the pins on the connector. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called msbusmouse.o. ATIXL busmouse support CONFIG_ATIXL_BUSMOUSE This is a rare type of busmouse that is connected to the back of an ATI video card. Note that most ATI mice are actually Microsoft busmice. Read the Busmouse-HOWTO, available via ftp (user: anonymous) in ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called atixlmouse.o. If you are unsure, say N and read the HOWTO nevertheless: it will tell you what you have. Support for user miscellaneous modules CONFIG_UMISC This option forces generic miscellaneous minor device support in the kernel, and allows later loading of user miscellaneous device modules, such as drivers for optic pens and touchscreens. Unless you need such specific modules, or are willing to write/test one, just say N. QIC-02 tape support CONFIG_QIC02_TAPE If you have a non-SCSI tape drive like that, say Y. Or, if you want to compile this driver as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called tpqic02.o. Do you want runtime configuration for QIC-02 CONFIG_QIC02_DYNCONF You can either configure this driver once and for all by editing a header file (include/linux/tpqic02.h), in which case you should say N, or you can fetch a program via anonymous ftp which is able to configure this driver during runtime. The program to do this is called 'qic02conf' and it is part of the 'tpqic02-support-X.Y.tar.gz' support package. If you want to use the qic02conf program, say Y. Floppy tape drive (QIC-80/40/3010/3020/TR-1/TR-2/TR-3) support CONFIG_FTAPE If you have a tape drive that is connected to your floppy controller, say Y here. Some tape drives (like the Seagate "Tape Store 3200" or the Iomega "Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed" controller of their own. These drives (and their companion controllers) are also supported if you say Y here. If you have a special controller (such as the CMS FC-10, FC-20, Mountain Mach-II, or any controller that is based on the Intel 82078 FDC like the high speed controllers by Seagate and Exabyte and Iomega's "Ditto Dash") you must configure it by selecting the appropriate entries from the "Floppy tape controllers" sub-menu below and possibly modify the default values for the IRQ and DMA channel and the IO base in ftape's configuration menu. If you want to use your floppy tape drive on a PCI-bus based system, please read the file drivers/char/ftape/README.PCI. The ftape kernel driver is also available as a runtime loadable module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. The module will be called ftape.o. Note that the Ftape-HOWTO is out of date (sorry) and documents the older version 2.08 of this software but still contains useful information. There is a web page with more recent documentation at http://www-math.math.rwth-aachen.de/~LBFM/claus/ftape/ . This page always contains the latest release of the ftape driver and useful information (backup software, ftape related patches and documentation, FAQ). (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape.) Note that the file system interface has changed quite a bit compared to previous versions of ftape. Please read Documentation/ftape.txt. The file system interface for ftape CONFIG_ZFTAPE Normally, you want to say Y or M. DON'T say N here or you WON'T BE ABLE TO USE YOUR FLOPPY TAPE DRIVE. The ftape module itself no longer contains the routines necessary to interface with the kernel VFS layer (i.e. to actually write data to and read data from the tape drive). Instead the file system interface (i.e. the hardware independent part of the driver) has been moved to a separate module. If you say M zftape will be compiled as a runtime loadable module ( = code which can be inserted in and removed from the running kernel whenever you want). In this case you should read Documentation/modules.txt. The module will be called zftape.o. Regardless of whether you say Y or M here, an additional runtime loadable module called `zft-compressor.o' which contains code to support user transparent on-the-fly compression based on Ross William's lzrw3 algorithm will be produced. If you have enabled the kernel module loader (i.e. have said Y to "Kernel module loader support", above) then `zft-compressor.o' will be loaded automatically by zftape when needed. Despite its name, zftape does NOT use compression by default. The file Documentation/ftape.txt contains a short description of the most important changes in the file system interface compared to previous versions of ftape. The ftape home page http://www-math.math.rwth-aachen.de/~LBFM/claus/ftape/ contains further information (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). IMPORTANT NOTE: zftape can read archives created by previous versions of ftape and provide file mark support (i.e. fast skipping between tape archives) but previous version of ftape will lack file mark support when reading archives produced by zftape. Default block size for zftape CONFIG_ZFT_DFLT_BLK_SZ If unsure leave this at its default value, i.e. 10240. Note that you specify only the default block size here. The block size can be changed at run time using the MTSETBLK tape operation with the MTIOCTOP ioctl (i.e. with "mt -f /dev/qft0 setblk #BLKSZ" from the shell command line). The probably most striking difference between zftape and previous versions of ftape is the fact that all data must be written or read in multiples of a fixed block size. The block size defaults to 10240 which is what GNU tar uses. The values for the block size should be either 1 or multiples of 1024 up to a maximum value of 63488 (i.e. 62k). If you specify `1' then zftape's builtin compression will be disabled. Reasonable values are `10240' (GNU tar's default block size), `5120' (afio's default block size), `32768' (default block size some backup programs assume for SCSI tape drives) or `1' (no restriction on block size, but disables builtin compression). Number of DMA buffers CONFIG_FT_NR_BUFFERS Please leave this at `3' unless you REALLY know what you are doing. It is not necessary to change this value. Values below 3 make the proper use of ftape impossible, values greater than 3 are a waste of memory. You can change the amount of DMA memory used by ftape at runtime with "mt -f /dev/qft0 setdrvbuffer #NUMBUFFERS". Each buffer wastes 32kb of memory. Please note that this memory cannot be swapped out. Procfs entry for ftape CONFIG_FT_PROC_FS Optional. Saying Y will result in creation of a directory `/proc/ftape' under the proc file system. The files can be viewed with your favorite pager (i.e. use "more /proc/ftape/history" or "less /proc/ftape/history" or simply "cat /proc/ftape/history"). The file will contain some status information about the inserted cartridge, the kernel driver, your tape drive, the floppy disk controller and the error history for the most recent use of the kernel driver. Saying Y will enlarge the size of the ftape driver by approximately 2k. WARNING: When compiling ftape as a module (i.e. saying `M' to "Floppy tape drive") it is dangerous to use ftape's proc file system interface. Accessing `/proc/ftape' while the module is unloaded will result in a kernel Oops. This cannot be fixed from inside ftape. Controlling the amount of debugging output of ftape CONFIG_FT_NORMAL_DEBUG This option controls the amount of debugging output the ftape driver is ABLE to produce; it does not increase or diminish the debugging level itself. If unsure, leave this at its default setting, i.e. choose "Normal". Ftape can print lots of debugging messages to the system console resp. kernel log files. Reducing the amount of possible debugging output reduces the size of the kernel module by some kb, so it might be a good idea to use "None" for emergency boot floppies. If you want to save memory then the following strategy is recommended: leave this option at its default setting "Normal" until you know that the driver works as expected, afterwards reconfigure the kernel, this time specifying "Reduced" or "None" and recompile and install the kernel as usual. Note that choosing "Excessive" debugging output does not increase the amount of debugging output printed to the console but only makes it possible to produce "Excessive" debugging output. Please read Documentation/ftape.txt for a short description how to control the amount of debugging output. The floppy drive controller for ftape CONFIG_FT_STD_FDC Only change this setting if you have a special controller. If you didn't plug any add-on card into your computer system but just plugged the floppy tape cable into the already existing floppy drive controller then you don't want to change the default setting, i.e. choose "Standard". Choose "MACH-2" if you have a Mountain Mach-2 controller. Choose "FC-10/FC-20" if you have a Colorado FC-10 or FC-20 controller. Choose "Alt/82078" if you have another controller that is located at an IO base address different from the standard floppy drive controller's base address of `0x3f0', or uses an IRQ (interrupt) channel different from `6', or a DMA channel different from `2'. This is necessary for any controller card that is based on Intel's 82078 FDC such as Seagate's, Exabyte's and Iomega's "high speed" controllers. If you choose something other than "Standard" then please make sure that the settings for the IO base address and the IRQ and DMA channel in the configuration menus below are correct. Use the manual of your tape drive to determine the correct settings! If you are already successfully using your tape drive with another operating system then you definitely should use the same settings for the IO base, the IRQ and DMA channel that have proven to work with that other OS. Note that this menu lets you specify only the default setting for the hardware setup. The hardware configuration can be changed at boot time (when ftape is compiled into the kernel, i.e. if you have said Y to "Floppy tape drive") or module load time (i.e. if you have said M to "Floppy tape drive"). Please read also the file Documentation/ftape.txt which contains a short description of the parameters that can be set at boot or load time. If you want to use your floppy tape drive on a PCI-bus based system, please read the file drivers/char/ftape/README.PCI. IO base of the floppy disk controller used with Ftape CONFIG_FT_FDC_BASE You don't need to specify a value if the following default settings for the base IO address are correct: <<< MACH-2 : 0x1E0 >>> <<< FC-10/FC-20: 0x180 >>> <<< Secondary : 0x370 >>> Secondary refers to a secondary FDC controller like the "high speed" controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash. Please make sure that the setting for the IO base address specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already successfully using the tape drive with another operating system then you definitely should use the same settings for the IO base that has proven to work with that other OS. Note that this menu lets you specify only the default setting for the IO base. The hardware configuration can be changed at boot time (when ftape is compiled into the kernel, i.e. if you specified Y to "Floppy tape drive") or module load time (i.e. if you have said M to "Floppy tape drive"). Please read also the file Documentation/ftape.txt which contains a short description of the parameters that can be set at boot or load time. IRQ channel for the floppy disk controller used with Ftape CONFIG_FT_FDC_IRQ You don't need to specify a value if the following default settings for the interrupt channel are correct: <<< MACH-2 : 6 >>> <<< FC-10/FC-20: 9 >>> <<< Secondary : 6 >>> Secondary refers to secondary a FDC controller like the "high speed" controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash. Please make sure that the setting for the IO base address specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already successfully using the tape drive with another operating system then you definitely should use the same settings for the IO base that has proven to work with that other OS. Note that this menu lets you specify only the default setting for the IRQ channel. The hardware configuration can be changed at boot time (when ftape is compiled into the kernel, i.e. if you specified Y to "Floppy tape drive") or module load time (i.e. if you have said M to "Floppy tape drive"). Please read also the file Documentation/ftape.txt which contains a short description of the parameters that can be set at boot or load time. DMA channel for the floppy disk controller used with Ftape CONFIG_FT_FDC_DMA You don't need to specify a value if the following default settings for the DMA channel are correct: <<< MACH-2 : 2 >>> <<< FC-10/FC-20: 3 >>> <<< Secondary : 2 >>> Secondary refers to a secondary FDC controller like the "high speed" controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash. Please make sure that the setting for the IO base address specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already successfully using the tape drive with another operating system then you definitely should use the same settings for the IO base that has proven to work with that other OS. Note that this menu lets you specify only the default setting for the DMA channel. The hardware configuration can be changed at boot time (when ftape is compiled into the kernel, i.e. if you specified Y to "Floppy tape drive") or module load time (i.e. if you have said M to "Floppy tape drive"). Please read also the file Documentation/ftape.txt which contains a short description of the parameters that can be set at boot or load time. FDC FIFO Threshold before requesting DMA service CONFIG_FT_FDC_THR Set the FIFO threshold of the FDC. If this is higher the DMA controller may serve the FDC after a higher latency time. If this is lower, fewer DMA transfers occur leading to less bus contention. You may try to tune this if ftape annoys you with "reduced data rate because of excessive overrun errors" messages. However, this doesn't seem to have too much effect. If unsure, don't touch the initial value, i.e. leave it at "8". FDC maximum data rate CONFIG_FT_FDC_MAX_RATE With some motherboard/FDC combinations ftape will not be able to run your FDC/tape drive combination at the highest available speed. If this is the case you'll encounter "reduced data rate because of excessive overrun errors" messages and lots of retries before ftape finally decides to reduce the data rate. In this case it might be desirable to tell ftape beforehand that it need not try to run the tape drive at the highest available speed. If unsure, leave this disabled, i.e. leave it at 2000 bits/sec. MTRR control and configuration CONFIG_MTRR On Intel Pentium Pro/Pentium II systems the Memory Type Range Registers (MTRRs) may be used to control processor access to memory ranges. This is most useful when you have a video (VGA) card on a PCI or AGP bus. Enabling write-combining allows bus write transfers to be combined into a larger transfer before bursting over the PCI/AGP bus. This can increase performance of image write operations 2.5 times or more. This option creates a /proc/mtrr file which may be used to manipulate your MTRRs. Typically the X server should use this. This should have a reasonably generic interface so that similar control registers on other processors can be easily supported. This option also fixes a problem with buggy SMP BIOSes which only set the MTRRs for the boot CPU and not the secondary CPUs. This can lead to all sorts of problems. Compiling this as a module is not available because the BIOS fix needs to be done early in the boot sequence, otherwise your machine could lock up. See Documentation/mtrr.txt for more information. Main CPU frequency, only for DEC alpha machine CONFIG_FT_ALPHA_CLOCK On some DEC Alpha machines the CPU clock frequency cannot be determined automatically, so you need to specify it here ONLY if running a DEC Alpha, otherwise this setting has no effect. Zilog serial support CONFIG_SUN_ZS This driver does not exist at this point, so you might as well say N. Advanced Power Management CONFIG_APM APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a USER RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g., battery status change). Supporting software is available; for more information, read the Battery Powered Linux mini-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini. This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors. This driver does not support the TI 4000M TravelMate and the ACER 486/DX4/75 because they don't have compliant BIOSes. Many "green" desktop machines also don't have compliant BIOSes, and this driver will cause those machines to panic during the boot phase (typically, these machines are using a data segment of 0040, which is reserved for the Linux kernel). If you are running Linux on a laptop, you may also want to read the Linux Laptop homepage on the WWW at http://www.cs.utexas.edu/users/kharker/linux-laptop/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS). Some other things to try when experiencing seemingly random, "weird" problems: 1) passing the "no-hlt" option to the kernel 2) switching on floating point emulation in the kernel and passing the "no387" option to the kernel 3) passing the "floppy=nodma" option to the kernel 4) passing the "mem=4M" option to the kernel (thereby disabling all but the first 4M of RAM) 5) reading the sig11 FAQ at http://www.bitwizard.nl/sig11/ 6) disabling the cache from your BIOS settings 7) installing a better fan 8) exchanging RAM chips 9) exchanging the motherboard. Ignore USER SUSPEND CONFIG_APM_IGNORE_USER_SUSPEND This option will ignore USER SUSPEND requests. On machines with a compliant APM BIOS, you want to say N. However, on the NEC Versa M series notebooks, it is necessary to say Y because of a BIOS bug. Enable APM at boot time CONFIG_APM_DO_ENABLE Enable APM features at boot time. From page 36 of the APM BIOS specification: "When disabled, the APM BIOS does not automatically power manage devices, enter the Standby State, enter the Suspend State, or take power saving steps in response to CPU Idle calls." This driver will make CPU Idle calls when Linux is idle (unless this feature is turned off -- see "Do CPU IDLE calls", below). This should always save battery power, but more complicated APM features will be dependent on your BIOS implementation. You may need to turn this option off if your computer hangs at boot time when using APM support, or if it beeps continuously instead of suspending. Turn this off if you have a NEC UltraLite Versa 33/C or a Toshiba T400CDT. This is off by default since most machines do fine without this feature. Do CPU IDLE calls CONFIG_APM_CPU_IDLE Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. On some machines, this can activate improved power savings, such as a slowed CPU clock rate, when the machine is idle. These idle calls are made after the idle loop has run for some length of time (e.g., 333 mS). On some machines, this will cause a hang at boot time or whenever the CPU becomes idle. (On machines with more than one CPU, this option does nothing.) Enable console blanking using APM CONFIG_APM_DISPLAY_BLANK Enable console blanking using the APM. Some laptops can use this to turn off the LCD backlight when the screen blanker of the Linux virtual console blanks the screen. Note that this is only used by the virtual console screen blanker, and won't turn off the backlight when using the X Window system. This also doesn't have anything to do with your VESA-compliant power-saving monitor. Further, this option doesn't work for all laptops -- it might not turn off your backlight at all, or it might print a lot of errors to the console, especially if you are using gpm. Power off on shutdown CONFIG_APM_POWER_OFF Enable the ability to power off the computer after the Linux kernel is halted. You will need software (e.g., a suitable version of the halt(8) command ("man 8 halt")) to cause the computer to power down. Recent versions of the sysvinit package available from ftp://sunsite.unc.edu/pub/Linux/system/daemons/init/ (user: anonymous) contain support for this ("halt -p" shuts down Linux and powers off the computer). As with the other APM options, this option may not work reliably with some APM BIOS implementations. Ignore multiple suspend/standby events CONFIG_APM_IGNORE_MULTIPLE_SUSPEND This option is necessary on the IBM Thinkpad 560, but should work on all other laptops. When the APM BIOS returns multiple suspend or standby events while one is already being processed they will be ignored. Without this the Thinkpad 560 has troubles with the user level daemon apmd, and with the PCMCIA package pcmcia-cs. Watchdog Timer Support CONFIG_WATCHDOG If you say Y here (and to one of the following options) and create a character special file /dev/watchdog with major number 10 and minor number 130 using mknod ("man mknod"), you will get a watchdog, i.e.: subsequently opening the file and then failing to write to it for longer than 1 minute will result in rebooting the machine. This could be useful for a networked machine that needs to come back online as fast as possible after a lock-up. There's both a watchdog implementation entirely in software (which can sometimes fail to reboot the machine) and a driver for hardware watchdog boards, which are more robust and can also keep track of the temperature inside your computer. For details, read Documentation/watchdog.txt in the kernel source. The watchdog is usually used together with the watchdog daemon which is available via ftp (user: anonymous) from ftp://tsx-11.mit.edu/pub/linux/sources/sbin/. This daemon can also monitor NFS connections and can reboot the machine when the process table is full. If unsure, say N. Disable watchdog shutdown on close CONFIG_WATCHDOG_NOWAYOUT The default watchdog behaviour (which you get if you say N here) is to stop the timer if the process managing it closes the file /dev/watchdog. It's always remotely possible that this process might get killed. If you say Y here, the watchdog cannot be stopped once it has been started. WDT Watchdog timer CONFIG_WDT If you have a WDT500P or WDT501P watchdog board, say Y here, otherwise N. It is not possible to probe for this board, which means that you have to set the IO port and IRQ it uses in the kernel source at the top of drivers/char/wdt.c. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called wdt.o. WDT501 features CONFIG_WDT_501 Saying Y here and creating a character special file /dev/temperature with major number 10 and minor number 131 ("man mknod") will give you a thermometer inside your computer: reading from /dev/temperature yields one byte, the temperature in degrees Fahrenheit. This works only if you have a WDT501P watchdog board installed. Fan Tachometer CONFIG_WDT_501_FAN Enable the Fan Tachometer on the WDT501. Only do this if you have a fan tachometer actually set up. Software Watchdog CONFIG_SOFT_WATCHDOG A software monitoring watchdog. This will fail to reboot your system from some situations that the hardware watchdog will recover from. Equally it's a lot cheaper to install. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. The module will be called softdog.o. Berkshire Products PC Watchdog CONFIG_PCWATCHDOG This is the driver for the Berkshire Products PC Watchdog card. This card simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. This driver is like the WDT501 driver but for different hardware. Please read Documentation/pcwd-watchdog.txt. The PC watchdog cards can be ordered from http://www.berkprod.com. Some example rc.local files are available from ftp://ftp.bitgate.com. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called pcwd.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Most people will say N. Acquire SBC Watchdog Timer CONFIG_ACQUIRE_WDT This is the driver for the hardware watchdog on the PSC-6x86 Single Board Computer produced by Acquire Inc (and others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. This driver is like the WDT501 driver but for different hardware. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called pscwdt.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Most people will say N. Enhanced Real Time Clock Support CONFIG_RTC If you say Y here and create a character special file /dev/rtc with major number 10 and minor number 135 using mknod ("man mknod"), you will get access to the real time clock built into your computer. Every PC has such a clock built in. It can be used to generate signals from as low as 1Hz up to 8192Hz, and can also be used as a 24 hour alarm. It reports status information via the file /proc/rtc and its behaviour is set by various ioctls on /dev/rtc. People running SMP (= multiprocessor) versions of Linux should say Y here to read and set the RTC clock in a SMP compatible fashion. (They should also read Documentation/smp and Documentation/IO-APIC.txt and the SMP-FAQ on the WWW at http://www.irisa.fr/prive/mentre/smp-faq/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape)). If you think you have a use for such a device (such as periodic data sampling), then say Y here, and go read the file Documentation/rtc.txt for details. Tadpole ANA H8 Support CONFIG_H8 The Hitachi H8/337 is a microcontroller used to deal with the power and thermal environment. If you say Y here, you will be able to communicate with it via via a character special device. If unsure, say N. /dev/nvram support CONFIG_NVRAM If you say Y here and create a character special file /dev/nvram with major number 10 and minor number 144 using mknod ("man mknod"), you get access to the 50 bytes of non-volatile memory in the real time clock (RTC), which is contained in every PC and most Ataris. This memory is conventionally called "CMOS RAM" on PCs and "NVRAM" on Ataris. /dev/nvram may be used to view settings there, or to change them (with some utility). It could also be used to frequently save a few bits of very important data that may not be lost over power-off and for which writing to disk is too insecure. On Atari machines, /dev/nvram is always configured and does not need to be selected. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called nvram.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. PC joystick support CONFIG_JOYSTICK If you have a PC compatible analog or digital joystick, you can say Y here. If you then create a character special file under /dev with major number 15 and minor number 0 or 1 (for the two joystick ports) using mknod ("man mknod"), you can read the status of the buttons and the x and y coordinates from that file. Please read the file Documentation/joystick.txt which contains more information and the location of the joystick package that you'll need. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called joystick.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Sound card support CONFIG_SOUND If you have a sound card in your computer, i.e. if it can say more than an occasional beep, say Y. Be sure to have all the information about your sound card and its configuration down (I/O port, interrupt and DMA channel), because you will be asked for it. You want to read the Sound-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO. There is also some information in various README files in drivers/sound, esp. in Readme.cards which you should read first to find out whether your card is supported by Linux. If you have a PnP sound card and you want to configure it at boot time using the ISA PnP tools (read http://www.roestock.demon.co.uk/isapnptools/ (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape)), then you need to compile the sound card support as a module ( = code which can be inserted in and removed from the running kernel whenever you want) and load that module after the PnP configuration is finished. To do this, say M here and read Documentation/modules.txt as well as drivers/sound/Readme.modules; the module will be called sound.o. I'm told that even without a sound card, you can make your computer say more than an occasional beep, by programming the PC speaker. Kernel patches and programs to do that are in the pcsndrv package on sunsite.unc.edu:/pub/Linux/kernel/patches/console/. ProAudioSpectrum 16 support CONFIG_PAS Answer Y only if you have a Pro Audio Spectrum 16, ProAudio Studio 16 or Logitech SoundMan 16 sound card. Don't answer Y if you have some other card made by Media Vision or Logitech since they are not PAS16 compatible. 100% Sound Blaster compatibles (SB16/32/64, ESS, Jazz16) support CONFIG_SB Answer Y if you have an original SoundBlaster card made by Creative Labs or a 100% hardware compatible clone (like the Thunderboard or SM Games). If your card was in the list of supported cards look at the card specific instructions in the drivers/sound/Readme.cards file before answering this question. For an unknown card you may answer Y if the card claims to be SoundBlaster compatible. Please read Documentation/sound/Soundblaster. If you have an SB AWE 32 or SB AWE 64, say Y here and to "Additional lowlevel drivers" and to "SB32/AWE support" below. Are you using the IBM Mwave "emulation" of SB ? CONFIG_SB_MWAVE The IBM Mwave can do what's loosely describable as emulation of an 8bit SoundBlaster card if you load the right firmware from DOS warm boot and pray and your machine happens to like you. Say Y if you are doing this as the IRQ test normally fails on the Mwave emulation. Please read Documentation/sound/mwave. Generic OPL2/OPL3 FM synthesizer support CONFIG_ADLIB Answer Y if your card has a FM chip made by Yamaha (OPL2/OPL3/OPL4). Answering Y is usually a safe and recommended choice, however some cards may have software (TSR) FM emulation. Enabling FM support with these cards may cause trouble (I don't currently know of any such cards, however). If unsure, say Y. #Loopback MIDI device support #CONFIG_VMIDI ### ### somebody please fill this in. ### # Gravis Ultrasound support CONFIG_GUS Say Y here for any type of Gravis Ultrasound card, including the GUS or GUS MAX. Please read Documentation/sound/ultrasound for more information. MPU-401 support (NOT for SB16) CONFIG_MPU401 Be careful with this question. The MPU401 interface is supported by all sound cards. However, some natively supported cards have their own driver for MPU401. Enabling this MPU401 option with these cards will cause a conflict. Also, enabling MPU401 on a system that doesn't really have a MPU401 could cause some trouble. If your card was in the list of supported cards, look at the card specific instructions in the drivers/sound/Readme.cards file. It's safe to answer Y if you have a true MPU401 MIDI interface card. 6850 UART Midi support CONFIG_UART6850 This option enables support for MIDI interfaces based on the 6850 UART chip. This interface is rarely found on sound cards. It's safe to answer N to this question. PSS (AD1848, ADSP-2115, ESC614) support CONFIG_PSS Answer Y only if you have Orchid SW32, Cardinal DSP16 or some other card based on the PSS chipset (AD1848 codec + ADSP-2115 DSP chip + Echo ESC614 ASIC CHIP). #Enable PSS mixer (Beethoven ADSP-16 and other compatible) #CONFIG_PSS_MIXER ### ### Don't know what this is ### # 16 bit sampling option of GUS (_NOT_ GUS MAX) CONFIG_GUS16 Answer Y if you have installed the 16 bit sampling daughtercard on your GUS. Answer N if you have a GUS MAX, since saying Y here disables GUS MAX support. GUS MAX support CONFIG_GUSMAX Answer Y only if you have a Gravis Ultrasound MAX. Microsoft Sound System support CONFIG_MSS Again think carefully before answering Y to this question. It's safe to answer Y if you have the original Windows Sound System card made by Microsoft or Aztech SG 16 Pro (or NX16 Pro). Also you may answer Y in case your card is NOT among these: ATI Stereo F/X, AdLib, Audio Excell DSP16, Cardinal DSP16, Ensoniq SoundScape (and compatibles made by Reveal and Spea), Gravis Ultrasound, Gravis Ultrasound ACE, Gravis Ultrasound Max, Gravis Ultrasound with 16 bit option, Logitech Sound Man 16, Logitech SoundMan Games, Logitech SoundMan Wave, MAD16 Pro (OPTi 82C929), Media Vision Jazz16, MediaTriX AudioTriX Pro, Microsoft Windows Sound System (MSS/WSS), Mozart (OAK OTI-601), Orchid SW32, Personal Sound System (PSS), Pro Audio Spectrum 16, Pro Audio Studio 16, Pro Sonic 16, Roland MPU-401 MIDI interface, Sound Blaster 1.0, Sound Blaster 16, Sound Blaster 16ASP, Sound Blaster 2.0, Sound Blaster AWE32, Sound Blaster Pro, TI TM4000M notebook, ThunderBoard, Turtle Beach Tropez, Yamaha FM synthesizers (OPL2, OPL3 and OPL4), 6850 UART MIDI Interface. For cards having native support in VoxWare, consult the card specific instructions in drivers/sound/Readme.cards. Some drivers have their own MSS support and saying Y to this option will cause a conflict. Ensoniq Soundscape support CONFIG_SSCAPE Answer Y if you have a sound card based on the Ensoniq SoundScape chipset. Such cards are being manufactured at least by Ensoniq, Spea and Reveal (Reveal makes also other cards). MediaTriX AudioTriX Pro support CONFIG_TRIX Answer Y if you have the AudioTriX Pro sound card manufactured by MediaTrix. Support for OPTi MAD16 and/or Mozart based cards CONFIG_MAD16 Answer Y if your card has a Mozart (OAK OTI-601) or MAD16 (OPTi 82C928 or 82C929 or 82C931) audio interface chip. Please read Documentation/sound/MAD16. Please read Documentation/sound/Opti. For the 82C931, additional information is in drivers/sound/README.C931. These chips are currently quite common so it's possible that many no-name cards have one of them. In addition the MAD16 chip is used in some cards made by known manufacturers such as Turtle Beach (Tropez), Reveal (some models) and Diamond (latest ones). Support MIDI in older MAD16 based cards (requires SB) CONFIG_MAD16_OLDCARD Answer Y (or M) if you have an older card based on the C928 or Mozart chipset and you want to have MIDI support. If you enable this option you also need to enable support for SoundBlaster. Support for Crystal CS4232 based (PnP) cards CONFIG_CS4232 Say Y here if you have a card based on the Crystal CS4232 chip set, which use the Plug and Play protocol. Please read Documentation/sound/CS4232 for more info. Support for Turtle Beach Wave Front (Maui, Tropez) synthesizers CONFIG_MAUI Say Y here if you have a Turtle Beach Wave Front, Maui, or Tropez sound card. /dev/dsp and /dev/audio support CONFIG_AUDIO Answering N disables /dev/dsp and /dev/audio, the A/D and D/A converter devices. Answer N only if you know you will not need the option. They are usually required. Answer Y. MIDI interface support CONFIG_MIDI Answering N disables /dev/midixx devices and access to any MIDI ports using /dev/sequencer and /dev/music. This option also affects any MPU401 and/or General MIDI compatible devices. Answer Y. FM synthesizer (YM3812/OPL-3) support CONFIG_YM3812 Answer Y here, unless you know you will not need the option. For OPL-3 cards, you may want to read Documentation/sound/OPL3. Sun Audio support CONFIG_SUN_AUDIO This is support for the sound cards on Sun workstations. The code does not exist yet, so you might as well say N here. Additional low level drivers CONFIG_LOWLEVEL_SOUND If you need additional low level sound drivers which have not yet appeared, say Y. The answer to this question does not directly affect the kernel; saying Y will simply cause this configure script to present you with more options. If unsure, say Y. ACI mixer (miroPCM12) CONFIG_ACI_MIXER Audio Command Interface (ACI) driver. ACI is a protocol used to communicate with the microcontroller on some sound cards produced by miro, e.g. the miroSOUND PCM12 and PCM20. The main function of the ACI is to control the mixer and to get a product identification. This Voxware ACI driver currently only supports the ACI functions on the miroSOUND PCM12 card. On the PCM20, ACI also controls the radio tuner on this card, however this is not yet supported in this software. SB32/AWE support CONFIG_AWE32_SYNTH Say Y here if you have a SoundBlaster SB32, AWE32-PnP, SB AWE64 or similar sound card. See drivers/sound/lowlevel/README.awe, Documentation/sound/AWE32 and the Soundblaster-AWE mini-HOWTO, available via ftp (user: anonymous) from ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/mini for more info. Gallant's Audio Excel DSP 16 support (SC-6000 and SC-6600) CONFIG_AEDSP16 Answer Y if you have a Gallant's Audio Excel DSP 16 card. This card can emulate either an SBPro or a Microsoft Sound System card, so you should have said Y to either "SoundBlaster (SB, SBPro, SB16, clones) support" or "Microsoft Sound System support", above, and you need to answer the "MSS emulation" and "SBPro emulation" questions below accordingly. You should say Y to one and only one of these two questions. Read the drivers/sound/lowlevel/README.aedsp16 file and the head of drivers/sound/lowlevel/aedsp16.c to get more information about this driver and its configuration. This driver supports Audio Excel DSP 16 but not the III nor Pnp versions of this card. Read drivers/sound/lowlevel/README.aedsp16 if you want to know something more on how to use the III version with this sound driver. SC-6600 based audio cards (new Audio Excel DSP 16) CONFIG_SC6600 The SC6600 is the new version of DSP mounted on the Audio Excel DSP 16 cards. Find in the manual the FCC ID of your audio card and answer Y if you have an SC6600 DSP. Audio Excel DSP 16 (MSS emulation) CONFIG_AEDSP16_MSS Answer Y if you want your audio card to emulate Microsoft Sound System. You should then say Y to "Microsoft Sound System support" and say N to "Audio Excel DSP 16 (SBPro emulation)". Audio Excel DSP 16 (SBPro emulation) CONFIG_AEDSP16_SBPRO Answer Y if you want your audio card to emulate Sound Blaster Pro. You should then say Y to "SoundBlaster (SB, SBPro, SB16, clones) support" and N to "Audio Excel DSP 16 (MSS emulation)". Kernel profiling support CONFIG_PROFILE This is for kernel hackers who want to know how much time the kernel spends in the various procedures. The information is stored in /proc/profile (say Y to "/proc filesystem support"!) and in order to read it, you need the readprofile package from sunsite.unc.edu:/pub/Linux/kernel. Its manpage gives information regarding the format of profiling data. To become a kernel hacker, you can start with the Kernel Hacker's Guide at http://www.redhat.com:8080/HyperNews/get/khg.html (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). Mere mortals say N. Profile shift count CONFIG_PROFILE_SHIFT This is used to adjust the granularity with which the addresses of executed instructions get recorded in /proc/profile. But since you said Y to "Kernel profiling support", you must be a kernel hacker and hence you know what this is about :-) Magic System Request Key support CONFIG_MAGIC_SYSRQ If you say Y here, you will have some control over the system even if the system crashes for example during kernel debugging (e.g., you will be able to flush the disks, reboot the system immediately or dump some status information). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does. ISDN subsystem CONFIG_ISDN ISDN ("Integrated Services Digital Networks", called RNIS in France) is a special type of fully digital telephone service; it's mostly used to connect to your Internet service provider (with SLIP or PPP). The main advantage is that the speed is higher than ordinary modem/telephone connections, and that you can have voice conversations while downloading stuff. It only works if your computer is equipped with an ISDN card and both you and your service provider purchased an ISDN line from the phone company. For details, read http://alumni.caltech.edu/~dank/isdn/ on the WWW. (To browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape.) This driver allows you to use an ISDN-card for networking connections and as dialin/out device. The isdn-tty's have a built in AT-compatible modem emulator. Network devices support autodial, channel-bundling, callback and caller-authentication without having a daemon running. A reduced T.70 protocol is supported with tty's suitable for German BTX. On D-Channel, the protocols EDSS1 (Euro-ISDN) and 1TR6 (German style) are supported. See Documentation/isdn/README for more information. If you want to compile the ISDN code as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called isdn.o. If unsure, say N. Support synchronous PPP CONFIG_ISDN_PPP Over digital connections such as ISDN, there is no need to synchronize sender and recipient's clocks with start and stop bits as is done over analog telephone lines. Instead, one can use "synchronous PPP". Saying Y here will include this protocol. This protocol is used by Cisco and Sun for example. So you want to say Y here if the other end of your ISDN connection supports it. You will need a special version of pppd (called ipppd) for using this feature. See Documentation/isdn/README.syncppp and Documentation/isdn/syncPPP.FAQ for more information. Support generic MP (RFC 1717) CONFIG_ISDN_MPP With synchronous PPP enabled, it is possible to increase throughput by bundling several ISDN-connections, using this protocol. See Documentation/isdn/README.syncppp for more information. Use VJ-compression with synchronous PPP CONFIG_ISDN_PPP_VJ This enables Van Jacobson header compression for synchronous PPP. Say Y if the other end of the connection supports it. Support audio via ISDN CONFIG_ISDN_AUDIO If you say Y here, the modem-emulator will support a subset of the EIA Class 8 Voice commands. Using a getty with voice-support (mgetty+sendfax by gert@greenie.muc.de with an extension, available with the ISDN utility package for example), you will be able to use your Linux box as an ISDN-answering machine. Of course, this must be supported by the lowlevel driver also. Currently, the HiSax driver is the only voice-supporting driver. See Documentation/isdn/README.audio for more information. X.25 PLP on top of ISDN (EXPERIMENTAL) CONFIG_ISDN_X25 This experimental feature provides the X.25 protocol over ISDN connections. See Documentation/isdn/README.x25 for more information if you are thinking about using this. ICN 2B and 4B support CONFIG_ISDN_DRV_ICN This enables support for two kinds of ISDN-cards made by a German company called ICN. 2B is the standard version for a single ISDN line with two B-channels, 4B supports two ISDN lines. For running this card, additional firmware is necessary, which has to be downloaded into the card using a utility which is distributed separately. See Documentation/isdn/README and README.icn for more information. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called icn.o. isdnloop support CONFIG_ISDN_DRV_LOOP This driver provides a virtual ISDN card. Its primary purpose is testing of linklevel features or configuration without getting charged by your service-provider for lots of phone calls. You need will need the loopctrl utility from the latest isdn4k-utils package to set up this driver. HiSax SiemensChipSet driver support CONFIG_ISDN_DRV_HISAX This is a driver supporting the Siemens chipset on various ISDN-cards (like AVM A1, Elsa ISDN cards, Teles S0-16.0, Teles S0-16.3, Teles S0-8, Teles/Creatix PnP, ITK micro ix1 and many compatibles). HiSax is just the name of this driver, not the name of any hardware. If you have a card with such a chipset, you should say Y here and also to the configuration option of the driver for your particular card, below. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called hisax.o. See Documentation/isdn/README.HiSax for more information on using this driver. HiSax Support for Teles 16.0/8.0 CONFIG_HISAX_16_0 This enables HiSax support for the Teles ISDN-cards S0-16.0, S0-8 and many compatibles. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port/shmem settings. HiSax Support for Teles 16.3 or PNP or PCMCIA CONFIG_HISAX_16_3 This enables HiSax support for the Teles ISDN-cards S0-16.3 the Teles/Creatix PnP and the Teles PCMCIA. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Teles 16.3c CONFIG_HISAX_TELES3C This enables HiSax support for the Teles ISDN-cards 16.3c. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for AVM A1 (Fritz) CONFIG_HISAX_AVM_A1 This enables HiSax support for the AVM A1 (aka "Fritz"). See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Elsa ISA cards CONFIG_HISAX_ELSA This enables HiSax support for the Elsa Mircolink ISA cards, for the Elsa Quickstep series cards and Elsa PCMCIA. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for ITK ix1-micro Revision 2 CONFIG_HISAX_IX1MICROR2 This enables HiSax support for the ITK ix1-micro Revision 2 card. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Eicon.Diehl Diva cards CONFIG_HISAX_DIEHLDIVA This enables HiSax support for the Eicon.Diehl Diva none PRO versions passive ISDN cards. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for ASUSCOM cards CONFIG_HISAX_ASUSCOM This enables HiSax support for the AsusCom and their OEM versions passive ISDN cards. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for TELEINT cards CONFIG_HISAX_TELEINT This enables HiSax support for the TELEINT SA1 semiactiv ISDN card. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Sedlbauer speed card/win-star CONFIG_HISAX_SEDLBAUER This enables HiSax support for the Sedlbauer passive ISDN cards. See Documentation/isdn/README.HiSax on how to configure it using the different cards, a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for USR Sportster internal TA CONFIG_HISAX_SPORTSTER This enables HiSax support for the USR Sportster internal TA card. See Documentation/isdn/README.HiSax on how to configure it using a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for MIC card CONFIG_HISAX_MIC This enables HiSax support for the ITH MIC card. See Documentation/isdn/README.HiSax on how to configure it using a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for NETjet card CONFIG_HISAX_NETJET This enables HiSax support for the NetJet from Traverse Technologies. See Documentation/isdn/README.HiSax on how to configure it using a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Niccy PnP/PCI card CONFIG_HISAX_NICCY This enables HiSax support for the Dr. Neuhaus Niccy PnP or PCI. See Documentation/isdn/README.HiSax on how to configure it using a different D-channel protocol, or non-standard IRQ/port settings. HiSax Support for Am7930 (EXPERIMENTAL) CONFIG_HISAX_AMD7930 This enables HiSax support for the AMD7930 chips on some sparcs. This code is not finished yet. HiSax Support for EURO/DSS1 CONFIG_HISAX_EURO Say Y or N according to the D-channel protocol which your local telephone service company provides. NOTE: If you say Y here and you have only one ISDN card installed, you cannot say Y to "HiSax Support for German 1TR6", below. And vice versa. Support for German tariff info CONFIG_DE_AOC If you want that the HiSax hardware driver sends messages to the upper level of the isdn code on each AOCD (Advice Of Charge, During the call - transmission of the fee information during a call) and on each AOCE (Advice Of Charge, at the End of the call - transmission of fee information at the end of the call), say Y here. This works only in Germany. Support for Australian Microlink service (not for std. EURO) CONFIG_HISAX_ML If you are in Australia and connected to the Microlink telephone network, enable this, because there are little differences in protocol. Please don't enable this in other countries. HiSax Support for US/NI-1 (not released yet) CONFIG_HISAX_NI1 Say Y or N according to the D-channel protocol which your local telephone service company provides. HiSax Support for German 1TR6 CONFIG_HISAX_1TR6 Say Y or N according to the D-channel protocol which your local telephone service company provides. NOTE: If you say Y here and you have only one ISDN card installed, you cannot say Y to "HiSax Support for EURO/DSS1", above. And vice versa. PCBIT-D support CONFIG_ISDN_DRV_PCBIT This enables support for the PCBIT ISDN-card. This card is manufactured in Portugal by Octal. For running this card, additional firmware is necessary, which has to be downloaded into the card using a utility which is distributed separately. See Documentation/isdn/README and Documentation/isdn/README.pcbit for more information. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M here and read Documentation/modules.txt. The module will be called pcbit.o. Spellcaster support (EXPERIMENTAL) CONFIG_ISDN_DRV_SC This enables support for the Spellcaster BRI ISDN boards. This driver currently builds only in a modularized version ( = code which can be inserted in and removed from the running kernel whenever you want, details in Documentation/modules.txt); the module will be called sc.o. See Documentation/isdn/README.sc and http://www.spellcast.com for more information (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape). AVM-B1 with CAPI2.0 support CONFIG_ISDN_DRV_AVMB1 This enables support for the AVM B1 ISDN networking cards. In addition, a CAPI (Common ISDN Application Programming Interface, a standard making it easy for programs to access ISDN hardware, see http://www.capi.org/; to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) interface for this card is provided. In order to use this card, additional firmware is necessary, which has to be downloaded into the card using a utility which is distributed separately. Please read the file Documentation/isdn/README.avmb1. This code is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called avmb1.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Verbose reason code reporting (kernel size +=7K) CONFIG_ISDN_DRV_AVMB1_VERBOSE_REASON If you say Y here, the AVM B1 driver will give verbose reasons for disconnecting. This will increase the size of the kernel by 7K. If unsure, say Y. IBM Active 2000 support (EXPERIMENTAL) CONFIG_ISDN_DRV_ACT2000 Say Y here if you have an IBM Active 2000 ISDN card. In order to use this card, additional firmware is necessary, which has to be loaded into the card using a utility which is part of the latest isdn4k-utils package. Please read the file Documentation/isdn/README.act2000 for more information. Support for AP1000 multicomputer CONFIG_AP1000 This enables support for a sparc based parallel multi-computer called AP1000+. For details on our efforts to port Linux to this machine see http://cap.anu.edu.au/cap/projects/linux (to browse the WWW, you need to have access to a machine on the Internet that has a program like lynx or netscape) or mail to hackers@cafe.anu.edu.au Sparc ESP SCSI support CONFIG_SCSI_SUNESP This is the driver for the Sun ESP SCSI host adapter. The ESP chipset is present in most SPARC-based computers. Sparc /dev/openprom compatibility driver CONFIG_SUN_OPENPROMIO This driver provides user programs with an interface to the Sparc PROM device tree. The driver implements a SunOS-compatible interface and a NetBSD-compatible interface. If you want to compile this as a module ( = code which can be inserted in and removed from the running kernel whenever you want), say M and read Documentation/modules.txt. If unsure, say Y. #Mostek real time clock support #CONFIG_SUN_MOSTEK_RTC # #Siemens SAB82532 serial support #CONFIG_SAB82532 ### ### Please someone fill these in. ### # # m68k-specific kernel options # Documented by Chris Lawrence et al. # Amiga support CONFIG_AMIGA This option enables support for the Amiga series of computers. If you plan to use this kernel on an Amiga, say Y here and browse the material available in Documentation/m68k; otherwise say N. Atari support CONFIG_ATARI This option enables support for the 68000-based Atari series of computers (including the TT, Falcon and Medusa). If you plan to use this kernel on an Atari, say Y here and browse the material available in Documentation/m68k; otherwise say N. Macintosh support CONFIG_MAC This option enables support for the Apple Macintosh series of computers (yes, there is experimental support now, at least for part of the series). Say N unless you're willing to code the remaining necessary support. ;) # CONFIG_APOLLO, etc. coming soon (?) 68020 support CONFIG_M68020 If you anticipate running this kernel on a computer with a MC68020 processor, say Y. Otherwise, say N. Note that the 68020 requires a 68851 MMU (= memory management unit) to run Linux/m68k. 68030 support CONFIG_M68030 If you anticipate running this kernel on a computer with a MC68030 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not work, as it does not include an MMU (= memory management unit). 68040 support CONFIG_M68040 If you anticipate running this kernel on a computer with a MC68LC040 or MC68040 processor, say Y. Otherwise, say N. Note that an MC68EC040 will not work, as it does not include an MMU (= memory management unit). Use -m68040 flag for 68040 specific optimizations CONFIG_OPTIMIZE_040 If you will only be running this kernel on a 68040-series processor, this will make the kernel run somewhat faster. However, it will no longer run on a 68020 or 68030, no matter whether you included 68020 and 68030 support or not. Say N unless the only processor you are compiling support for is the 68040 (or 68LC040). 68060 support CONFIG_M68060 If you anticipate running this kernel on a computer with a MC68060 processor, say Y. Otherwise, say N. Use -m68060 flag for 68060 specific optimizations CONFIG_OPTIMIZE_060 If you will only be running this kernel on a 68060-series processor, this will make the kernel run somewhat faster. However, it will no longer run on a 68020, 68030 or 68040, no matter whether you included support for those processors or not. Say N unless the only processor you are compiling support for is the 68060. Advanced processor options CONFIG_ADVANCED_CPU This gives you access to some advanced options for the CPU. The defaults should be fine for most users, but these options may make it possible for you to improve performance somewhat if you know what you are doing. Most users should say N to this question. Use read-modify-write instructions CONFIG_RMW_INSNS This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the workaround of disabling interrupts, it can conflict with DMA (= direct memory access) on many Amiga systems, and it is also said to destabilize other machines. It is very likely that this will cause serious problems on any Amiga or Atari Medusa if set. The only configuration where it should work are 68030-based Ataris, where it apparently improves performance. But you've been warned! Unless you really know what you are doing, say N. Try Y only if you're quite adventurous. Amiga AutoConfig Identification CONFIG_ZORRO This enables support for automatic identification of Amiga expansion cards that obey the AutoConfig(tm) specification. Say Y if you want your expansion cards to be identified on bootup; it will enlarge your kernel by about 10KB. The identification information is also available through /proc/zorro (say Y to "/proc filesystem support"!). Note that even if you say N here, you can still use your expansion cards. If in doubt, say Y. Amiga OCS chipset support CONFIG_AMIFB_OCS This enables support for the original Agnus and Denise video chips, found in the Amiga 1000 and most A500's and A2000's. If you intend to run Linux on any of these systems, say Y; otherwise say N. Amiga ECS chipset support CONFIG_AMIFB_ECS This enables support for the Enhanced Chip Set, found in later A500's, later A2000's, the A600, the A3000, the A3000T and CDTV. If you intend to run Linux on any of these systems, say Y; otherwise say N. Amiga AGA chipset support CONFIG_AMIFB_AGA This enables support for the Advanced Graphics Architecture (also known as the AGA or AA) Chip Set, found in the A1200, A4000, A4000T and CD32. If you intend to run Linux on any of these systems, say Y; otherwise say N. Amiga Cybervision support CONFIG_FB_CYBER This enables support for the Cybervision 64 graphics card from Phase5. Please note that its use is not all that intuitive (i.e. if you have any questions, be sure to ask!). Say N unless you have a Cybervision 64 or plan to get one before you next recompile the kernel. Please note that this driver DOES NOT support the Cybervision 64 3D card at present, as they use incompatible video chips. Amiga GSP (TMS340x0) support CONFIG_AMIGA_GSP Include support for Amiga graphics cards that use the Texas Instruments TMS340x0 GSP (= graphics signal processor) chips. Say Y if you want to use a DMI Resolver or Commodore A2410 (Lowell) graphics card on an Amiga; otherwise, say N. DMI Resolver support CONFIG_GSP_RESOLVER Include support in the kernel for the DMI Resolver graphics card. If you have one, say Y; otherwise, say N. A2410 support CONFIG_GSP_A2410 Include support in the kernel for the Commodore/University of Lowell A2410 graphics card. If you have one, say Y; otherwise, say N. Amiga Zorro II ramdisk support CONFIG_AMIGA_Z2RAM This enables support for using Chip RAM and Zorro II RAM as a ramdisk or as a swap partition. Say Y if you want to include this driver in the kernel. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called z2ram.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Atari ACSI support CONFIG_ATARI_ACSI This enables support for the Atari ACSI interface. The driver supports hard disks and CD-ROMs, which have 512-byte sectors, or can be switched to that mode. Due to the ACSI command format, only disks up to 1 GB are supported. Special support for certain ACSI to SCSI adapters, which could relax that, isn't included yet. The ACSI driver is also the basis for certain other drivers for devices attached to the ACSI bus: Atari SLM laser printer, BioNet-100 Ethernet, and PAMsNet Ethernet. If you want to use one of these devices, you need ACSI support, too. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called acsi.o. Probe all LUNs on each ACSI device CONFIG_ACSI_MULTI_LUN If you have a ACSI device that supports more than one LUN (Logical Unit Number), e.g. a CD jukebox, you should say Y here so that all will be found by the ACSI driver. An ACSI device with multiple LUNs acts logically like multiple ACSI devices. The vast majority of ACSI devices have only one LUN, and so most people can say N here and should in fact do so, because it is safer. Atari SLM laser printer support CONFIG_ATARI_SLM If you have an Atari SLM laser printer, say Y to include support for it in the kernel. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called acsi_slm.o. Be warned: the driver needs much ST-RAM and can cause problems due to that fact! A3000 WD33C93A support CONFIG_A3000_SCSI If you have an Amiga 3000 and have SCSI devices connected to the built-in SCSI controller, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called wd33c93.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. A2091 WD33C93A support CONFIG_A2091_SCSI If you have a Commodore A2091 SCSI controller, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called wd33c93.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. GVP Series II WD33C93A support CONFIG_GVP11_SCSI If you have a Great Valley Products Series II SCSI controller, say Y. Also say Y if you have a later model of GVP SCSI controller (such as the GVP A4008 or a Combo board). Otherwise, say N. This driver does NOT work for the T-Rex series of accelerators from TekMagic and GVP-M. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module will be called gvp11.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Cyberstorm SCSI support CONFIG_CYBERSTORM_SCSI If you have an Amiga with an original (MkI) Phase5 Cyberstorm accelerator board and the optional Cyberstorm SCSI controller, say Y. Otherwise, say N. Cyberstorm II SCSI support CONFIG_CYBERSTORMII_SCSI If you have an Amiga with a Phase5 Cyberstorm MkII accelerator board and the optional Cyberstorm SCSI controller, say Y. Otherwise, say N. Blizzard 2060 SCSI support CONFIG_BLZ2060_SCSI If you have an Amiga with a Phase5 Blizzard 2060 accelerator board and want to use the onboard SCSI controller, say Y. Otherwise, say N. Blizzard 1230IV/1260 SCSI support CONFIG_BLZ1230_SCSI If you have an Amiga 1200 with a Phase5 Blizzard 1230IV or Blizzard 1260 accelerator, and the optional SCSI module, say Y. Otherwise, say N. Fastlane SCSI support CONFIG_FASTLANE_SCSI If you have the Phase5 Fastlane Z3 SCSI controller, or plan to use one in the near future, say Y to this question. Otherwise, say N. Atari native SCSI support CONFIG_ATARI_SCSI If you have an Atari with built-in NCR5380 SCSI controller (TT, Falcon, ...) say Y to get it supported. Of course also, if you have a compatible SCSI controller (e.g. for Medusa). This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called atari_scsi.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. This driver supports both styles of NCR integration into the system: the TT style (separate DMA), and the Falcon style (via ST-DMA, replacing ACSI). It does NOT support other schemes, like in the Hades (without DMA). Long delays for Toshiba CD-ROMs CONFIG_ATARI_SCSI_TOSHIBA_DELAY This option increases the delay after a SCSI arbitration to accommodate some flaky Toshiba CD-ROM drives. Say Y if you intend to use a Toshiba CD-ROM drive; otherwise, the option is not needed and would impact performance a bit, so say N. Ariadne support CONFIG_ARIADNE If you have a VillageTronics Ariadne Ethernet adapter, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called ariadne.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. A2065 support CONFIG_A2065 If you have a Commodore A2065 Ethernet adapter, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called a2065.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Hydra support CONFIG_HYDRA If you have a Hydra Ethernet adapter, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called hydra.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Atari Lance support CONFIG_ATARILANCE Say Y to include support for several Atari Ethernet adapters based on the AMD Lance chipset: RieblCard (with or without battery), or PAMCard VME (also the version by Rhotron, with different addresses). BioNet-100 support CONFIG_ATARI_BIONET Say Y to include support for BioData's BioNet-100 Ethernet adapter for the ACSI port. The driver works (has to work...) with a polled I/O scheme, so it's rather slow :-( PAMsNet support CONFIG_ATARI_PAMSNET Say Y to include support for the PAMsNet Ethernet adapter for the ACSI port ("ACSI node"). The driver works (has to work...) with a polled I/O scheme, so it's rather slow :-( Multiface Card III parallel support CONFIG_MULTIFACE_III_LP If you have a Multiface III card for your Amiga, and want to use its parallel port in Linux, say Y. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called lp_m68k.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Amiga mouse support CONFIG_AMIGAMOUSE If you want to be able to use an Amiga mouse in Linux, say Y. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called amigamouse.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Amiga Copper Console CONFIG_COPCON This configures the console to use the Amiga's graphics coprocessor for scrolling, instead of using the CPU. This option markedly improves response times in the high color modes (5 bitplanes and up). If you would like to use this, say Y; otherwise, say N. Atari mouse support CONFIG_ATARIMOUSE If you want to be able to use an Atari mouse in Linux, say Y. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). The module is called atarimouse.o. If you want to compile it as a module, say M here and read Documentation/modules.txt. Atari MFP serial support CONFIG_ATARI_MFPSER If you like to use the MFP serial ports ("Modem1", "Serial1") under Linux, say Y. The driver equally supports all kinds of MFP serial ports and automatically detects whether Serial1 is available. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Note for Falcon users: You also have an MFP port, it's just not wired to the outside... But you could use the port under Linux. Atari SCC serial support CONFIG_ATARI_SCC If you have serial ports based on a Zilog SCC chip (Modem2, Serial2, LAN) and like to use them under Linux, say Y. All built-in SCC's are supported (TT, MegaSTE, Falcon), and also the ST-ESCC. If you have two connectors for channel A (Serial2 and LAN), they are visible as two separate devices. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Atari SCC serial DMA support CONFIG_ATARI_SCC_DMA This enables DMA support for receiving data on channel A of the SCC. If you have a TT you may say Y here and read drivers/char/atari_SCC.README. All other users should say N here, because only the TT has SCC-DMA, even if your machine keeps claiming so at boot time. Atari MIDI serial support CONFIG_ATARI_MIDI If you want to use your Atari's MIDI port in Linux, say Y. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Atari DSP56k Digital Signal Processor support CONFIG_ATARI_DSP56K If you want to be able to use the DSP56001 in Falcons, say Y. This driver is still experimental, and if you don't know what it is, or if you don't have this processor, just say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Amiga builtin serial support CONFIG_AMIGA_BUILTIN_SERIAL If you want to use your Amiga's built-in serial port in Linux, say Y. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. GVP IO-Extender support CONFIG_GVPIOEXT If you want to use a GVP IO-Extender serial card in Linux, say Y. Otherwise, say N. Multiface Card III serial support CONFIG_MULTIFACE_III_TTY If you want to use a Multiface III card's serial port in Linux, say Y. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Amiga or Atari DMA sound support CONFIG_DMASOUND If you want to use the internal audio of your Atari or Amiga in Linux, answer Y to this question. This will provide a Sun-like /dev/audio, compatible with the Linux/i386 sound system. Otherwise, say N. This driver is also available as a module ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. MSDOS partition support CONFIG_MSDOS_PARTITION This option enables support for using hard disks that were partitioned on an MS-DOS system. This may be useful if you are sharing a hard disk between i386 and m68k Linux boxes, for example. Say Y if you need this feature; users who are only using their system-native partitioning scheme can say N here. Build PowerMac Kernel (not PReP) CONFIG_PMAC There are currently two different kinds of PowerPC-based machines available: Apple Power Macintoshes and clones (such as the Motorola Starmax series, and PReP (PowerPC Reference Platform) machines such as the Motorola PowerStack range. Currently, a single kernel binary only supports one type or the other. Say Y here to compile a kernel which will run on Power Macintoshes and clones. Build PReP Kernel (not PowerMac) CONFIG_PREP Say Y here to compile a kernel which will run on PReP (PowerPC Reference Platform) machines such as the Motorola PowerStack range. For Power Macintosh clones, including the Motorola Starmaxes, you should say N (and Y to the previous question). Processor type CONFIG_MCOMMON If you are compiling a kernel to run on a specific machine, you can indicate which type of PowerPC processor it has. Currently this option does very little. Support for Open Firmware device tree in /proc CONFIG_PROC_DEVICETREE This option adds a device-tree directory under /proc which contains an image of the device tree that the kernel copies from Open Firmware. If unsure, say Y here. Support for ATI Mach64 display cards CONFIG_ATY_VIDEO Several of the newer Power Macintoshes and clones have a video display interface based on the ATI Mach64 chipset. Say N here if you are sure you don't need this functionality, otherwise Y. Support for IMS Twin Turbo display card CONFIG_IMSTT_VIDEO Some Power Macintosh clones have an IMS Twin Turbo video display interface. Say Y to include support for this. MESH (Power Mac internal SCSI) support CONFIG_SCSI_MESH Many Power Macintoshes and clones have a MESH (Macintosh Enhanced SCSI Hardware) SCSI bus adaptor (the 7200 doesn't, but all of the other Power Macintoshes do). Say Y to include support for this SCSI adaptor. This driver is also available as a module called mesh.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Maximum synchronous transfer rate CONFIG_SCSI_MESH_SYNC_RATE On Power Macintoshes (and clones) where the MESH SCSI bus adaptor drives a bus which is entirely internal to the machine (such as the 7500, 7600, 8500, etc.), the MESH is capable of synchronous operation at up to 10MB/s. On machines where the SCSI bus controlled by the MESH can have external devices connected, it is usually rated at 5MB/s. 5 is a safe value here unless you know the MESH SCSI bus is internal only; in that case you can say 10. Say 0 to disable synchronous operation. 53C94 (Power Mac external SCSI) support CONFIG_SCSI_MAC53C94 On Power Macintoshes (and clones) with two SCSI buses, the external SCSI bus is usually controlled by a 53C94 SCSI bus adaptor. Older machines which only have one SCSI bus, such as the 7200, also use the 53C94. Say Y to include support for the 53C94. This driver is also available as a module called mac53c94.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. MACE (Power Mac Ethernet) support CONFIG_MACE Power Macintoshes and clones with Ethernet built-in on the motherboard will usually use a MACE (Medium Access Control for Ethernet) interface. Say Y to include support for the MACE chip. Video For Linux CONFIG_VIDEO_DEV Support for audio/video capture and overlay devices. The exact capabilities of each device vary. User tools for this are available from ftp://ftp.uk.linux.org/pub/linux/video4linux. This driver is also available as a module called videodev.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. BT848 Video For Linux CONFIG_VIDEO_BT848 Support for BT848 based frame grabber/overlay boards. This includes the Miro, Hauppauge and STB boards. This driver is also available as a module called bttv.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. SAA5249 Teletext processor CONFIG_VIDEO_SAA5249 Support for I2C bus based teletext using the SAA5249 chip. At the moment this is only useful on some European WinTV cards. This driver is also available as a module called saa5249.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Quickcam BW Video For Linux CONFIG_VIDEO_BWQCAM Say Y have if you the black and white version of the QuickCam camera. See the next option for the color version. This driver is also available as a module called bw-qcam.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. Colour QuickCam Video For Linux CONFIG_VIDEO_CQCAM This is the video4linux driver for the colour version of the Connectix Quickcam. If you have one of these cameras, say Y here, otherwise say N. This driver does not work with the original monochrome Quickcam, Quickcam VC or QuickClip. It is also available as a module (c-qcam.o). Mediavision Pro Movie Studio Video For Linux CONFIG_VIDEO_PMS Say Y if you have such a thing. This driver is also available as a module called pms.o ( = code which can be inserted in and removed from the running kernel whenever you want). If you want to compile it as a module, say M here and read Documentation/modules.txt. # # A couple of things I keep forgetting: # capitalize: DMA, Internet, Intel, IRQ, Linux, NetWare, NFS, PCI, SCSI # two words: hard drive, hard disk, sound card # other: it's safe to save; daemon # # This is used by Emacs' spell checker ispell.el: # # LocalWords: CONFIG coprocessor DX Pentium SX lilo loadlin HOWTO ftp sunsite # LocalWords: unc edu docs emu README kB BLK DEV FD Thinkpad fd MFM RLL IDE gz # LocalWords: cdrom diskless netboot nfs xzvf ATAPI MB ide pavia rubini pl pd # LocalWords: HD CDROMs IDECD NEC MITSUMI filesystem XT XD PCI bios cezar ATEN # LocalWords: ISA EISA Microchannel VESA BIOSes IPC SYSVIPC ipc Ctrl dmesg hlt # LocalWords: BINFMT Linkable http ac uk jo html GCC Sparc AVANTI CABRIOLET EB # LocalWords: netscape gcc LD CC toplevel MODVERSIONS insmod rmmod modprobe IP # LocalWords: genksyms INET loopback gatewaying ethernet PPP ARP Arp MEMSIZE # LocalWords: howto multicasting MULTICAST MBONE firewalling ipfw ACCT resp ip # 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