| /* -*- auto-fill -*- */ |
| |
| Device File System (devfs) Boot Options |
| |
| Richard Gooch <rgooch@atnf.csiro.au> |
| |
| 18-AUG-2001 |
| |
| |
| 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: |
| |
| 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 |
| |
| 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 |
| mounted). |
| |
| These are the options: |
| |
| dmod print module load requests to <request_module> |
| |
| dreg print device register requests to <devfs_register> |
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| dunreg print device unregister requests to <devfs_unregister> |
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| dchange print device change requests to <devfs_set_flags> |
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| dilookup print inode lookup requests |
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| diget print VFS inode allocations |
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| diunlink print inode unlinks |
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| dichange print inode changes |
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| dimknod print calls to mknod(2) |
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| 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 |
