I tried booting the latest 200809 snapshot CD, from Sep 10,
(8.0-CURRENT-200809-powerpc-bootonly.iso), on a eMac G4 "USB 2.0"
(PowerMac6,4). It fails with an "invalid memory access":
Booting [/boot/kernel/kernel] ...
Kernel entry at 0x100100 ...
Invalid memory access at %SRR0: 00100100 %SRR1: 10003030
I tried booting by pressing "C" or by "boot cd:,\boot\loader cd:0"
several times with the same result, but one time I got a "Decrementer
exception" instead of "Invalid memory access".
Then I tried the latest 7.1_BETA snapshot and it booted fine! In fact
it's installing right now without problems.