Comment 2 for bug 1674402

I think I see the broad strokes of what's gone wrong here. In vm/block-device.d/10-partition we had a branch for ppc which sets up two partitions; this PReP boot partition and the main one. I don't see that we've migrated this correctly to the new bootloader.

I think this is just a matter of setting different default bootloader configs for ppc

[1] https://git.openstack.org/cgit/openstack/diskimage-builder/tree/elements/vm/block-device.d/10-partition?h=1.28.0#n13