Re: [uml-devel] Debug uml kernel won't boot (VFS: Unable to mount root fs)

[Joydeep Sen Sarma <jsensarma@yahoo.com>]

as i mentioned - i have already tried the
root=/dev/ubd/0 option and that doesn't work too.
In any case, non-debug kernel works without root
option,

Joydeep

--- Henrik Nordstrom <hno@marasystems.com> wrote:
> You need to use root=... to specify which device or
> partition the root is
> on. The ubd0 argument just connects the ubda device
> to the specified file,
> it does not specify that the root is there.
> 
> Regards
> Henrik
> 
> 
> On Mon, 15 Dec 2003, Joydeep Sen Sarma wrote:
> 
> > Hi folks,
> > 
> > The regular uml kernel worked fine till i turned
> > on the debug option. Kernel version is 2.4.22 and
> > I applied uml patch 2.4.22-6 to it. Root file
> System
> > is the Debian-3.0r0.ext2.bz2 image from uml home
> page.
> > 
> > # ls -l root_fs
> > -rw-r--r--    1 root     root     62862336 Dec 14
> > 18:06 root_fs
> > # ./linux ubd0=root_fs debug gdb-pid=2646
> > 
> > >From debugger, failure happens here:
> > 
> > Breakpoint 3, do_kern_mount (fstype=0xa194b000
> "ext2",
> > flags=32769, 
> >     name=0xa1949000 "/dev/root", data=0x0) at
> > super.c:793
> > (gdb)
> > get_sb_bdev (fs_type=0xa01fb930, flags=-12,
> > dev_name=0xa1949000 "/dev/root", 
> >     data=0x0) at super.c:669
> > 
> > this call in get_sb_nodev fails:
> > 	error = path_lookup(dev_name,
> > LOOKUP_FOLLOW|LOOKUP_POSITIVE, &nd);
> > 
> > with err code of ENOENT. Any ideas what's wrong or
> > how I can debug this ? (I have tried the 
> > root=/dev/ubd/0 option - same result)
> > 
> > thanks,
> > 
> > Joydeep
> > 
> > 
> > 
> > 
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