Merge with Linux 2.4.2.

1 files changed, 174 insertions, 0 deletions

diff --git a/Documentation/cris/README b/Documentation/cris/README
new file mode 100644
index 000000000..b512873ff
--- /dev/null
+++ b/Documentation/cris/README
@@ -0,0 +1,174 @@
+Linux 2.4 on the CRIS architecture
+==================================
+$Id: README,v 1.5 2001/01/10 17:20:55 bjornw Exp $
+
+This is a port of Linux 2.4 to Axis Communications ETRAX 100LX embedded network CPU. For
+more information about CRIS and ETRAX please see further below.
+
+<... to come: instructions on how to grab the right gcc, compiling and booting ...>
+
+
+What is CRIS ?
+--------------
+
+CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU architecture in Axis
+Communication AB's range of embedded network CPU's, called ETRAX. The latest CPU is called
+ETRAX 100LX, where LX stands for 'Linux' because the chip was designed to be a good host for
+the Linux operating system.
+
+The ETRAX 100LX chip
+--------------------
+
+For reference, plase see the press-release:
+
+http://www.axis.com/news/us/001101_etrax.htm
+
+The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad range of 
+built-in interfaces, all with modern scatter/gather DMA.
+
+Memory interfaces:
+
+	* SRAM
+	* NOR-flash/ROM
+	* EDO or page-mode DRAM
+	* SDRAM
+
+I/O interfaces:
+
+	* one 10/100 Mbit/s ethernet controller
+	* four serial-ports (up to 6 Mbit/s)
+	* two synchronous serial-ports for multimedia codec's etc.
+	* USB host controller and USB slave
+	* ATA
+	* SCSI
+	* two parallel-ports
+	* two generic 8-bit ports
+	
+	(not all interfaces are available at the same time due to chip pin multiplexing)
+
+The previous version of the ETRAX, the ETRAX 100, sits in almost all of Axis shipping 
+thin-servers like the Axis 2100 web camera or the developer-board. It lacks an MMU so the
+Linux we run on that is a version of uClinux (Linux 2.0 without MM-support) ported to the CRIS
+architecture. The new Linux 2.4 port has full MM and needs a CPU with an MMU, so it will not
+run on the ETRAX 100. 
+
+A version of the Axis developer-board with ETRAX 100LX will be available as soon as the chip 
+is ramped up (please see http://developer.axis.com for further information on that).
+
+
+
+Bootlog
+-------
+
+Just as an example, this is the debug-output from a boot of Linux 2.4 on an Axis
+developer-board with ETRAX 100LX. The displayed BogoMIPS value is 5 times too small :)
+At the end you see some user-mode programs booting like telnet and ftp daemons.
+
+Linux version 2.4.0-test11 (bjornw@godzilla.axis.se) (gcc version 2.96 20000427 (experimental)) #358 Wed Nov 22 19:29:15 CET 2000
+ROM fs in RAM, size 368640 bytes
+Setting up paging and the MMU.
+On node 0 totalpages: 1024
+zone(0): 1024 pages.
+zone(1): 0 pages.
+zone(2): 0 pages.
+Linux/CRIS port (c) 2000 Axis Communications AB
+Kernel command line: 
+Calibrating delay loop... 19.92 BogoMIPS
+Memory: 6864k/8192k available (531k kernel code, 1328k reserved, 85k data, 24k init)
+kmem_create: Forcing size word alignment - vm_area_struct
+kmem_create: Forcing size word alignment - filp
+Dentry-cache hash table entries: 1024 (order: 0, 8192 bytes)
+Buffer-cache hash table entries: 2048 (order: 0, 8192 bytes)
+Page-cache hash table entries: 2048 (order: 0, 8192 bytes)
+kmem_create: Forcing size word alignment - kiobuf
+kmem_create: Forcing size word alignment - bdev_cache
+Inode-cache hash table entries: 1024 (order: 0, 8192 bytes)
+kmem_create: Forcing size word alignment - inode_cache
+POSIX conformance testing by UNIFIX
+Linux NET4.0 for Linux 2.4
+Based upon Swansea University Computer Society NET3.039
+kmem_create: Forcing size word alignment - skbuff_head_cache
+Starting kswapd v1.8
+kmem_create: Forcing size word alignment - file lock cache
+kmem_create: Forcing size word alignment - blkdev_requests
+ETRAX 100LX 10/100MBit ethernet v2.0 (c) 2000 Axis Communications AB
+eth0 initialized
+eth0: changed MAC to 00:40:8C:CD:00:00
+ETRAX 100LX serial-driver $Revision: 1.5 $, (c) 2000 Axis Communications AB
+ttyS0 at 0xb0000060 is a builtin UART with DMA
+ttyS1 at 0xb0000068 is a builtin UART with DMA
+ttyS2 at 0xb0000070 is a builtin UART with DMA
+ttyS3 at 0xb0000078 is a builtin UART with DMA
+NET4: Linux TCP/IP 1.0 for NET4.0
+IP Protocols: ICMP, UDP, TCP
+kmem_create: Forcing size word alignment - ip_dst_cache
+IP: routing cache hash table of 1024 buckets, 8Kbytes
+TCP: Hash tables configured (established 1024 bind 1024)
+NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
+VFS: Mounted root (cramfs filesystem) readonly.
+Init starts up...
+Setting up eth0 with ip 10.13.9.116 and mac 00:40:8c:18:04:60
+eth0: changed MAC to 00:40:8C:18:04:60
+Setting up lo with ip 127.0.0.1
+Default gateway is 10.13.9.1
+Hostname is bbox1
+Telnetd starting, using port 23.
+  using /bin/sh as shell.
+sftpd[14]: sftpd $Revision: 1.5 $ starting up
+
+
+And here is how some /proc entries look:
+
+17# cd /proc
+17# cat cpuinfo
+cpu             : ETRAX
+cpu revision    : 10
+cpu model       : ETRAX 100LX
+cache size      : 8 kB
+fpu             : no
+mmu             : yes
+ethernet        : 10/100 Mbps
+token ring      : no
+scsi            : yes
+ata             : yes
+usb             : yes
+bogomips        : 99.84
+17# cat meminfo
+        total:    used:    free:  shared: buffers:  cached:
+Mem:   7028736   925696  6103040   114688        0   229376
+Swap:        0        0        0
+MemTotal:         6864 kB
+MemFree:          5960 kB
+MemShared:         112 kB
+Buffers:             0 kB
+Cached:            224 kB
+Active:            224 kB
+Inact_dirty:         0 kB
+Inact_clean:         0 kB
+Inact_target:        0 kB
+HighTotal:           0 kB
+HighFree:            0 kB
+LowTotal:         6864 kB
+LowFree:          5960 kB
+SwapTotal:           0 kB
+SwapFree:            0 kB
+17# ls -l /bin
+-rwxr-xr-x  1 342      100         10356  Jan 01 00:00 ifconfig
+-rwxr-xr-x  1 342      100         17548  Jan 01 00:00 init
+-rwxr-xr-x  1 342      100          9488  Jan 01 00:00 route
+-rwxr-xr-x  1 342      100         46036  Jan 01 00:00 sftpd
+-rwxr-xr-x  1 342      100         48104  Jan 01 00:00 sh
+-rwxr-xr-x  1 342      100         16252  Jan 01 00:00 telnetd
+
+
+(All programs are statically linked to the libc at this point - we have not ported the
+ shared libraries yet)
+
+
+
+
+
+
+
+
+