/usr/share/qemu/ppc_rom.bin is in qemu-system-ppc 1:2.5+dfsg-5ubuntu10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/qemu/../openhackware/ppc_rom.bin
/usr/share/qemu/../openhackware/ppc_rom.bin