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/* -*- auto-fill -*- */
Device File System (devfs) Boot Options
Richard Gooch <>
When CONFIG_DEVFS_DEBUG is enabled, you can pass several boot options
to the kernel to debug devfs. The boot options are prefixed by
"devfs=", and are separated by commas. Spaces are not allowed. The
syntax looks like this:
and so on. For example, if you wanted to turn on debugging for module
load requests and device registration, you would do:
You may prefix "no" to any option. This will invert the option.
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
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
diget print VFS inode allocations
diunlink print inode unlinks
dichange print inode changes
dimknod print calls to mknod(2)
dall some debugging turned on
Other Options
These control the default behaviour of devfs. The options are:
mount mount devfs onto /dev at boot time
only disable non-devfs device nodes for devfs-capable drivers