I've been able to boot up using -x32 -v -f -x, but most of the kexts i'm using don't work. When I normal boot I just hang. i.e.
VoodooPS2 = fail
VoodooHDA = fail
IntelGMA950 = fail
IOFamily811x = fail
I'm using pc_efi9. It's a retail install with vanilla kernel.
you need efi string for gma 950 and graphics enable = yes
get all kext from iatkos s3 v2 use pacifist if you cant find them to install