Re: 2.5.51 won't boot with devfs enabled

From: Gregoire Favre (
Date: Fri Dec 13 2002 - 07:01:38 EST

On Wed, Dec 11, 2002 at 11:00:08AM +0100, Helge Hafting wrote:

TREMENDOUS: without those four ligns, I can boot 2.5.51 ;-)

Thank you very much!!!

> Booting anything later than 2.5.48 with devfs configured
> either needs an extra kernel parameter, or a code change.
> Something broke when do_mounts.c were reorganized.
> It doesn't matter wether devfs is used or not, as long as it
> is configured.
> The lilo solution:
> lilo tend to have a "root=/dev/hda1" or similiar.
> This gets converted to "root=0301" on the kernel command line.
> (Look at dmesg after a successful boot)
> But this don't work for some reason when devfs is configured.
> Use the following:
> append="root=/dev/hda1"
> to solve the problem. This isn't converted to numbers and works.
> Of course if you use auto-mounted devfs then you don't
> have a /dev/hda1 but a /dev/ide/host0/bus0/target0/lun0/part1
> instead. If so, use that as root instead. You still have
> to use the append= trick.
> The code solution:
> Edit init/do_mounts.c
> Remove the following lines from the beginning of
> the function prepare_namespace:
> sys_mount("devfs", "/dev", "devfs", 0, NULL);
> do_devfs = 1;
> #endif
> Then recompile, and the kernel should work with any lilo setup that
> worked for 2.5.47 and earlier. At least it worked for the setups
> I tried.
> This has no effect on kernels without devfs, and helps for kernels
> comiled with devfs wether devfs is used or not.
> I posted a patch for this, but there were no interest at all.

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