problems booting linux through solaris grub

I'm trying to boot linux through solaris grub.  The linux kernel looks like 
it's starting up, but then seems to get an error while trying to mount ext3 
filesystem, and then the kernel crashes.  The linux kernel is standard Redhat 
linux 4.0 installed on a v40z (amd64).  Has anyone seen this before?

Here's my menu.lst entry:

title Redhat
root (hd1,0)
kernel /vmlinuz-2.6.9-22.ELsmp ro root=LABEL/ rhgb quiet
initrd /initrd-2.6.9-22.ELsmp.img

BTW, the kernel boots fine if I boot from linux grub, but I have a special need 
for booting off solaris.

thanks!
 
 
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