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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:
    >>
    >>
    >>
    >>>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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    >Please read the FAQ at http://www.tux.org/lkml/
    >
    >
    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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