Kernel panic

[jarmo]

Got F12 running, but not with it's own kernel. It panics. Here's my gub.conf:

#boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title Fedora (2.6.31.5-127.fc12.i686)
        root (hd0,0)
        kernel /vmlinuz-2.6.31.5-127.fc12.i686 ro 			 
root=/dev/VolGroup00/LogVol00 SYSFONT=latarcyrheb-sun16 LANG=fi_FI.UTF-8 
KEYTABLE=fi-latin1
        initrd /initramfs-2.6.31.5-127.fc12.i686.img

title Fedora (2.6.31.6)
        root (hd0,0)
        kernel /vmlinuz-2.6.31.6 ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.31.6.img

Except SYSFONT and text after I don't see any failure, or blind me?
FC12 makes panic, but vanilla 2.6.32.6 starts?

Panic tells something, that have to set root=, unknown (0,0) and tells then 
available partitions.
Sorry, that can't log perfect message of panic.

Any help?

Jarmo