In past I read several times the MPC5200b Datasheet, Users Guide and Users manual, and nowhere mentioned only one device.

There is mentioned only:
- only one ATA controller
- ATA ver. 4 compatible.
Note: Two devices per controller supported from ATA v.1, two controllers from v.2, v.3 adds S.M.A.R.T, v.4 adds support for CD (ATAPI)
- low controller current
- short cable needed
- missing CSEL signal - i.e. pin 28 not connected.

It means we need:
- external power for IDE bus
- short ( I have 5 cm ) 44-pin ATA cable with three connectors M-F-F, crossed pairs between M and F
- setup disks (or IDE-SATA converters) with jumpers to master and slave.

All was tested with IDE HDD and IDE-mSATA converter + mSATA SSD. Prooved in Open firmware, link is in post #2 above.