Date: Fri, 30 Dec 2005 07:31:24 -0500 (EST)
From: Thomas Molina <tmolina@cablespeed.com>
To: Erez Zilber <erezz@voltaire.com>
cc: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: cannot boot 2.6.15-rc6 on Opteron machine
In-Reply-To: <43B3CA9E.7000804@voltaire.com>
Message-ID: <Pine.LNX.4.63.0512300725300.5860@dad.localdomain>
References: <43B3CA9E.7000804@voltaire.com>
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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.
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