Quote Originally Posted by rpcook
Hmm, should I ask how you did this?
In the end I did get everything up and running. I submitted my changes to the Etherboot devs but I'm not sure if they're going to be incorporated or not. In my case the Realtek 8201 transceiver was being detected as something else, so I changed the discovery order by reordering the transceiver lookup table (mii_something.)

Actually the changes DID work, and what I ultimately found was that there were issues with the version I had in ROM 'polluting' the system even when I hit Quit. I suspect Etherboot doesn't exit entirely cleanly, but once I got everything working well I didn't pursue it.

The motherboard in this case is a Syntax S635MP motherboard. I've made the new BIOS with Etherboot support available here in case anyone else needs it.