Booting a udev only system

Booting a udev only system

[Sekhar Nori]

Hi,

I using kernel version 2.6.10 (kernel.org) and wish to use udev
instead of devfs. Using devfs I have been able to boot-up the kernel
using cramfs and busybox.

However, when trying to boot after I switch on CONFIG_HOTPLUG and
switching off CONFIG_DEVFS_FS, I get the following error on boot.

VFS: Cannot open root device "mtdblock/0" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I observed that do_mount_root called from mount_block_root in
init/do_mounts.c is Returning error code -6 (ENXIO - no such device or address)
when it tries to mount /dev/root on /root.

Should ramfs be the filesystem for /dev in case devfs is not used?
If yes, how can I get this configured?

I have the udev and hotplug programs loaded into the cramfs image,
but frankly I cant see how they come into the picture till the root
device is mounted successfully.

Is there any document on how to get a udev only system get started
on a kernel.org kernel and busybox. (without using initrd)

Any help in this regard is highly appreciated.

Thanks,
Sekhar Nori


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