Altboot stopped working

Late versions of altboot fail to boot for me:

Bad trap at PC: fffffffc, SR: 1000, vector=800
NIP: FFFFFFFC XER: 00000000 LR: 00001188 REGS: 0fffff0c TRAP: 0800 DAR: FFFFFFFF
MSR: 00001000 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00

GPR00: 01002064 0FFFFFFC FFFFFF1F 00000000 80000000 80000000 00000000 00000000
GPR08: 00000001 01010000 01012080 1000000C 01012063 03FBCB00 03FF8000 007FFF66
GPR16: 01000000 00000001 007FFF00 FFFFFFFF 00061057 00000001 00000000 00000000
GPR24: 00000001 01002044 056510AD 0000FFFF 010FFF94 00000001 00000000 FFFFFFFF
Call backtrace:
Exception in kernel pc fffffffc signal 0

I've tried loading them from memory and from flash and both fail.
This seems to affect all the latest snapshot binaries, I didn't have
any older builds to test with except the last one Frank Wille sent me
with the change to the SATA-driver so I'm not sure when it stopped
working.
I tried that old version and it worked, naturally.

There was some change 2 weeks ago acording to the webcvs to altboot
that might be the cause. Anyone else have similar problems?