This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle.
Changing version to '24'.
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Fixing the assignee.
moving here from https://github.com/rhinstaller/anaconda/issues/1483
POWER/OpenPOWER machines running the OPAL firmware create a new class of "powerpc" hardware that doesn't need the PReP partition as it uses petitboot as the bootloader. Petitboot reads bootloader configs (eg. grub.conf) from the disks directly. Both physical HW and qemu/KVM virtual machines (work in progress) can be PowerNV. The advantages are more flexible storage layout and being closer to x86.
After looking into the anaconda code, it looks feasible to implement the PowerNV support (touching platform.py and bootloader.py. Might need a little patch in blivet/arch.py too. I have few bits ready, but nothing complete yet.
I might have it ready, consisting of 2 part - blivet  and anaconda . I've done some basic testing, it seems to work, but proper testing requires a spare bare-metal Power machine. Full PowerNV support in qemu is still in development  which limits the ease of the testing.
test results seem to be OK, converting to PRs
In addition to these we need to loosen the grub-install requirement for the bootloader partition, or rather not do install any grub binaries on PowerNV.