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SubjectRe: PROBLEM: cannot boot 2.6.15-rc6 on Opteron machine
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:
>>>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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