OK, bulit memtest 3.3 from scratch and it's running.
interesting problem. The memtest built by buildrom won't boot on dbe62, the 3.3. version I built is fine and loads via etherboot just fine.
Anyway, it gets a depressingly large # of errors. We are definitely not doing something right :-)
For anyone who wants eboot for dbe62, my .config for linuxbios, a working memtest for all this, my scripts to build images, etc ... let me know.
thanks
ron