Do you still have /var/log/installer/syslog from such an installation? yaboot-installer should change Open Firmware's boot-device to point to the same bootstrap partition into which it installed yaboot.
** Changed in: partman-auto (Ubuntu) Status: Unconfirmed => Needs Info -- [powerpc] automatic partitioner creates second boot partition https://launchpad.net/bugs/60397 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs