Re: PROBLEM: cannot boot 2.6.15-rc6 on Opteron machine

[Ochal Christophe <ochal@kefren.be>]

Arjan van de Ven wrote:

> On Fri, 2005-12-30 at 07:31 -0500, Thomas Molina wrote:
>  
>
> > On Thu, 29 Dec 2005, Erez Zilber wrote:
> >
> >    
> >
> > > Hi,
> > >
> > > I've downloaded kernel 2.6.15-rc6 (had the same problem with rc7) and built it
> > > on RHAS 4:
> > >
> > > When I did that on an Opteron machine, after rebooting and selecting the
> > > 2.6.15-rc6 entry in the grub menu, I get the following:
> > >
> > > Uncompressing Linux... Ok, booting the kernel.
> > > Kernel panic - not syncing: VFS: unable to mount root fs on unknown-block(0,0)
> > >
> > > I made sure that ext2 is compiled with the kernel (not as a module).
> > >
> > > When I do the same on an emt64 machine, everything works ok. Any idea?
> > >      
> > Check on your /boot/grub.config.  The above error message is typically 
> > seen when the root= parameter points to a symbolic disk label instead of a 
> > specific disk such as /dev/hda1.  I'm not sure what the procedure for 
> > updating where the label points (possibly a mkinitrd) because I normally 
> > change the grub.conf to point to a specific disk.
> >    
>
> there is no such procedure, because the disk labels are... ON THE DISK.
> And the initrd reads them from all the disks at boot time to find the
> one needed. This means that if your disk changes name (for example
> because of a scsi bus order change or because of a different order you
> load the device drivers... or even if you forget to compile the sata
> drivers and suddenly the disk goes from /dev/sda to /dev/hda).... things
> just remain working
>
>
>
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>  
Compile the kernel with support for your hardware built in, i'm assuming 
you eighter build the controller as a module or didn't built it at all
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