Debian Live .iso fails at boot?

Grabbed one of the last of the Debian Live PPC .isos:
http://live.debian.net/archive/images/6.0_alpha2/powerpc/iso/

Set up the config as such:
http://pastebin.com/y3p1K0p6

It boots to the Debian yaboot prompt, so things seem to be going good.

Then it gets stuck at "returning from prom_init."
There are also issues ("invalid spr") from PearPPC output:
http://s1.postimage.org/7dhd32hal/debianfail.jpg

Maybe it's the kernel? Same problems with the latest Finnix.
cpu_pvr value? Commenting them all out or using 0x000c0000: same.
Desperation? video=ofonly at boot. Nope.

I waited a good 20-30 minutes. Maybe not long enough?

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