Description of problem:
booting from 2.6.20-1.2930.fc7 result in kernel panic
  
Actual results:

device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel
  Reading all physical volumes. This may take a while...
  No volume groups found
  Volume group "VolGroup00" not found
Unable to access resume device (/dev/VolGroup00/LogVol01)
mount: could not find filesystem '/dev/root'
setuproot: moving /dev failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!

the previous kernel-2925 boots w/o problems

Expected results:
booting without problems

Additional info:
grub.conf:
default=0
timeout=15
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.20-1.2930.fc7)
	root (hd0,0)
	kernel /vmlinuz-2.6.20-1.2930.fc7 ro root=/dev/VolGroup00/LogVol00 rhgb 
quiet
	initrd /initrd-2.6.20-1.2930.fc7.img
title Fedora (2.6.20-1.2925.fc7)
	root (hd0,0)
	kernel /vmlinuz-2.6.20-1.2925.fc7 ro root=/dev/VolGroup00/LogVol00 rhgb 
quiet
	initrd /initrd-2.6.20-1.2925.fc7.img