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/* -*- auto-fill -*- */
Device File System (devfs) Boot Options
Richard Gooch <rgooch@atnf.csiro.au>
14-DEC-1999
When either CONFIG_DEVFS_DEBUG or CONFIG_DEVFS_BOOT_OPTIONS are
enabled, you can pass several boot options to the kernel to control
devfs behaviour. The boot options are prefixed by "devfs=", and are
separated by commas. Spaces are not allowed. The syntax looks like
this:
devfs=<option1>,<option2>,<option3>
and so on. For example, if you wanted to turn on debugging for module
load requests and device registration, you would do:
devfs=dmod,dreg
Debugging Options
=================
These requires CONFIG_DEVFS_DEBUG to be enabled.
Note that all debugging options have 'd' as the first character. By
default all options are off. All debugging output is sent to the
kernel logs. The debugging options do not take effect until the devfs
version message appears (just prior to the root filesystem being
mounted).
These are the options:
dmod print module load requests to <request_module>
dreg print device register requests to <devfs_register>
dunreg print device unregister requests to <devfs_unregister>
dchange print device change requests to <devfs_set_flags>
dilookup print inode lookup requests
diread print inode reads
diunlink print inode unlinks
diwrite print inode writes
dimknod print calls to mknod(2)
dall some debugging turned on
Other Options
=============
These control the default behaviour of devfs. The options are:
show show unregistered devices by default
nomount do not mount devfs onto /dev at boot time
only disable non-devfs device nodes for devfs-capable drivers
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