And just to follow up, I posted an example skeleton project (skeleton.zip) on the webpage above which runs an FTDI serial port and simple command line interface on the M52221DEMO board, along with built-in administrative commands to perform flash cloning over ezport to a target board as well as S19 file firmware upgrading over the USB. If you run it and connect with HyperTerminal and press <Enter>, you'll see:
Welcome to XXX v0.9!
Copyright (c) 2008; all rights reserved.
> help
commands:
clone [run]
help
reset
upgrade
uptime
for more information:
help about
help clone
> _