Christophe Jarry wrote:
Under 2.6.33.3:

    $ sudo mount
    tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
    proc on /proc type proc (rw,noexec,nosuid,nodev)
    sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
    udev on /dev type tmpfs (rw,mode=0755)
    tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
    devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
    rootfs on / type rootfs (rw)

Under 2.6.37:

    $sudo mount
    tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
    proc on /proc type proc (rw,noexec,nosuid,nodev)
    sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
    udev on /dev type tmpfs (rw,mode=0755)
    tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
    devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
    rootfs on / type rootfs (rw)
    /dev/sda2 on /home type ext3 (rw)

So the only difference between the 2 is the "/dev/sda2 on /home type ext3 (rw)"
line, which appears only under 2.6.37.

The rootfs entries are interesting. I believe they are used by initrd, but should be overwritten by proper /dev entries later in the boot process.

What's the content of /proc/partitions for both kernels?

Under 2.6.33.3:

    $ cat /proc/partitions
    major minor  #blocks  name

       3        0  156290904 hda
       3        1    9767488 hda1
       3        2   58597087 hda2
       3        3     979965 hda3
       3        4   86943780 hda4

Under 2.6.37:

    $ cat /proc/partitions
    major minor  #blocks  name

       8        0  156290904 sda
       8        1    9767488 sda1
       8        2   58597087 sda2
       8        3     979965 sda3
       8        4   86943780 sda4

So the kernels see the partitions, but .33.3 doesn't have the device files. Then I think there's some problem with udev. Check the output of "udevinfo --export-db" with both kernels to know if udev sees your disk. Also see if you can find your partitions in /dev/disk/.

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