Hello,
Current adeos ppc has (at least) two problems with Apple G5 hardware:
* the PowerPC 970 decrementer does not work the same way as most ppc32 
decrementers: it can't be turned off and it's level-sensitive
* cascading interrupts aren't handled correctly
Attached is patch against fusion 0.7.4 included adeos to fix these 
problems (not the cleanest possible implementation, but the ppc32 kernel 
for g5 isn't either)

Regards,
  Heikki Lindholm