In case anyone is interested in fixing those, there are two regressions with
qemu-system-ppc64 in the current master branch:
$ ./qemu-system-ppc64 -M ppce500 -device macio-oldworld
qemu-system-ppc64: ../../devel/qemu/softmmu/memory.c:2443:
memory_region_add_subregion_common: Assertion `!subregion->container' failed.
$ ./qemu-system-ppc64 -device power8_v2.0-spapr-cpu-core,help
/home/thuth/devel/qemu/include/hw/boards.h:24:MACHINE: Object 0x5635bd53af10
is not an instance of type machine
Aborted (core dumped)
Thomas
