Hello,
Except for some fs/iso9660/ issues, ppc64 guests are booting for me with the last five OpenBIOS patches posted.
You can find them together with the config change to use fs/grubfs/ here:
git://repo.or.cz/openbios/afaerber.git ppc64-boot
Please test your favorite ppc64 kernels and images with obj-ppc64/ openbios-qemu.elf!
If I don't hear of regressions, I'll commit those patches. Once that is done and the iso9660 issues hopefully fixed, I would ask for Blue to commit openbios-ppc and openbios-ppc64 blobs to QEMU. I'll then prepare a QEMU patch to switch the default qemu-system-ppc64 ppc_newworld.c BIOS from openbios-ppc to openbios-ppc64.
Thanks, Andreas