core4 on powerpc64 ( g5 ) [ new iSight model ]

[FluffyArmada]

I've been trying to get linux to boot on my new iMac G5 w/ iSight.
I'll start booting, the kernel looks like it loads... it get a white screen ( looks like some stuff going on in openfirmware ) with some text, then I get some nasty ugly console text with a black background printing *over* the openfirmware-looking stuff.
Then everything stops. :-)
Any ideas why it does this?
The black says something about my cpu, spits out some icky hexadecimal and then dies. :-(
-- kyle