Powermac G5 freezes in the boot process when an additional PIC-X NIC is installed. I tried two different Intel NICs which work fine under Debian PPC (Intel 82545EM and a quadport 10/100). The boot process stops here:
pcib1: failed to reserve resource for pcib8
atapic2: 0x10 bytes of rid 0x20 res 4 failed (0, 0xffffffffffffffff).
atapci2: unable to map interrrupt
device_attach: atapci2 attach returned 6