OS4 should autoconfig CD-type devices. Just pop in a disc and it should show up.
Remember that port 1 master is unit 0, port 1 slave is unit 1, port 2 master is unit 2. and port 2 slave is unit 3. You might need to configure your UBoot variables to force a CD drive at a given unit - the automatic settting doesn't work for all drives (such as mine).
Never use CS/Cable Select when jumpering a drive.
