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Re: kernel-image-2.6.8-1-686 unable to mount root

On Thursday 04 November 2004 20:11, Eddy Jacob wrote:
> Hi everyone,
> I'm running debian, sarge. I installed the OS from Knoppix 3.4. I want
> to use kernel 2.6.8, but I've got a problem on booting
> kernel-image-2.6.8-1-686. I got this:
> Kernal panic: VFS: Unable to mount root fs on unknown-block(3,7)
> Currently I'm using kernel 2.4.26 default from Knoppix. I also got
> similar error when trying kernel-image-2.4.26.-1-686. I really don't
> know how to get it working.
> I've tried googling the web and searching all debian's list archive,
> and found many pages related to that specific error, but the solutions
> suggested were to compile the kernel with file system driver compiled
> and something about MSDOS partition support built into the kernel not
> as module.
> But I don't want to compile the kernel. What I don't understand is,
> why the package I downloaded from debian sarge, causes that error? Is
> it really because of the file system driver not compiled into the
> kernel? I thought that packages from sarge should be common enough so
> that user can just download them and use it.
> Also, the kernel-image downloaded from debian is unable to use the
> vesafb (I guess). my vga option in lilo.conf is vga=791, which is
> working under knoppix default.
> BTW, my lilo.conf is like:
> image=/boot/vmlinuz-2.4.26
>         label="Linux"
>         initrd=/boot/initrd.img-2.4.26
>         append="ramdisk_size=500000 lang=de apm=power-off hda=scsi
> hdb=scsi hdc=scsi hdd=scsi hde=scsi hdf=scsi hdg=scsi hdh=scsi nomce"
>         read-only
> image=/boot/vmlinuz-2.4.26-1-686
>         label="Linux-686"
>         vga=extended
>         initrd=/boot/initrd.img-2.4.26-1-686
>         append="ramdisk_size=500000 lang=de apm=power-off hda=scsi
> hdb=scsi hdc=scsi hdd=scsi hde=scsi hdf=scsi hdg=scsi hdh=scsi nomce"
>         read-only
> image=/boot/vmlinuz-2.6.8-1-686
>         label="Linux-2.6"
>         vga=extended
>         initrd=/boot/initrd.img-2.6.8-1-686
>         append="ramdisk_size=500000 lang=en apm=power-off hda=scsi nomce"
>         read-only
> I don't have a clue to why all hdx is equal to scsi. and what
> apm=power-off means and nomce?
There's a big debate on that one, but basically, it's for CD burning.  If 
you don't need to burn CDs, you probably don't need it.
This is a switch meant to make your computer power completely off when you 
choose shutdown from the gui menu, or when you issue the shutdown command 
from the command line.  If your computer is really old, your bios won't 
support it, and it won't work anyway.  If you don't care, take it out.  
Your computer may work anyway.
"This command disables self-diagnosis checks performed on the CPU. The 
kernel enables self-diagnosis on the CPU by default (called Machine Check 
Exception). On some older Compaq machines, this check is run too often and 
may need to be disabled."

Some of this information was gleaned from this page:

> Anyone have a solution to this? I've been trying to find answer to
> this for a week. Many thanks.

You did run lilo after you installed the new kernels, right?  You did tell 
lilo that your kernels use an initrd, right?

Justin Guerin

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