"Kernel Panic" upgrading from 2.4.27 to 2.6.8

[Aitor Roncal <aitor.roncal@gmail.com>]

Hi list.

I have big trouble upgrading my Debian server from Kernel 2.4.27 to
2.6.8, maybe cause of RAID System. My root filesystem is mounted over
RAID-1. I succeed in compiling new kernel 2.6.8 with RAID Support,
SerialATA, EXT2, EXt3, RaidAutoDetect and similar stuff built-in, as
needed in Kernel 2.4.27 to work properly as it does. But when trying
to boot the new kernel i get a "Kernel Panic: VFS: Unable to mount
root FS on unknown-block (9,1)". My fstab:

/dev/md1   /       ext3  errors=remount-ro  0 1
/dev/hda2  none    swap  sw                 0 0
proc       /proc   proc  defaults           0 0
/dev/hda1  /boot   ext2  defaults           0 2

where /dev/md1 is a fine working RAID-1 with partitions /dev/hda3 &
/dev/hdb3 (Linux Raid Autodetext) on my 2.4.27 system. Lilo.conf:

lba32
boot=/dev/hda
install=/boot/boot-menu.b
map=/boot/map
delay=20
vga=normal
timeout=50
prompt
default=Linux-2.4.27-2
image=/vmlinuz
       label=Linux-2.4.27-2
       root=/dev/md1
       read-only
       append="hdg=none"
image=/vmlinuz.new
       label=Linux-2.6.8
       root=/dev/md1
       read-only
       append="hdg=none"
       optional
       
I cannot see the big difference between 2.4.X & 2.6.X configs (i made
a "make oldconfig", and i have gone through both files again and
again). I would appreciate any help.

Thanks,
Aitor.