I suggest you learn how to read.
First of all, many embedded CPU's by IBM do have a MMU like the 440 GP or 440 GX for instance.
Moreover, we were discussing desktop usage, not PDA usage.
The whole idea that you can run a desktop OS lock, stock and barrel on a PDA is ridiculous.
You need to tailor it to specific resolutions, input devices etc.
ExecSG is flexible enough to cope without MMU if that were required.