> 2006 or whenever that was that Genesi didn't close the deal
> on a 5121e-based self-contained unit.

Not before 2007.

http://media.freescale.com/phoenix.zhtml?c=196520&p=irol-newsArticle&ID=1004385

> as far as I know it's the only OS that runs on 5121e-based computers.

"This includes support for popular real-time operating systems from Green Hills, QNX and Wind River, as well as open-source Linux solutions."
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC5121e