1 /* -*- auto-fill -*- */
3 Device File System (devfs) Boot Options
5 Richard Gooch <rgooch@atnf.csiro.au>
10 When CONFIG_DEVFS_DEBUG is enabled, you can pass several boot options
11 to the kernel to debug devfs. The boot options are prefixed by
12 "devfs=", and are separated by commas. Spaces are not allowed. The
13 syntax looks like this:
15 devfs=<option1>,<option2>,<option3>
17 and so on. For example, if you wanted to turn on debugging for module
18 load requests and device registration, you would do:
22 You may prefix "no" to any option. This will invert the option.
28 These requires CONFIG_DEVFS_DEBUG to be enabled.
29 Note that all debugging options have 'd' as the first character. By
30 default all options are off. All debugging output is sent to the
31 kernel logs. The debugging options do not take effect until the devfs
32 version message appears (just prior to the root filesystem being
35 These are the options:
37 dmod print module load requests to <request_module>
39 dreg print device register requests to <devfs_register>
41 dunreg print device unregister requests to <devfs_unregister>
43 dchange print device change requests to <devfs_set_flags>
45 dilookup print inode lookup requests
47 diget print VFS inode allocations
49 diunlink print inode unlinks
51 dichange print inode changes
53 dimknod print calls to mknod(2)
55 dall some debugging turned on
61 These control the default behaviour of devfs. The options are:
63 mount mount devfs onto /dev at boot time
65 only disable non-devfs device nodes for devfs-capable drivers