Comment 5 for bug 8136

I'd be inclined to rummage through /proc/device-tree until you find the correct
path to the disk, drop "/proc/device-tree" from the front of the full path, add
":" to the end, and use that as the value for device= in yaboot.conf.

Is the G5 network-connected? If so, the installer environment has nc, and you
could use that to get data out of it. I'd be interested in seeing the same
things as the yaboot maintainer requests in ofpath(8).