I've finally got everything working on my HP9000/340!
It netboots nicely off my Linux box, I can telnet to it, use it, 
etc, etc. About the only thing I can't do is login as root
from the console :-)

Anyway, in case anybody else is struggling with this, I've
made available my rbootd sources, together with a rather terse
HOWTO guide to getting things working. At some later date, I'll
tidy the code and #ifdef it so it can be merged with the NetBSD
sources... This is still beta software, naturally - I'd appreciate
being told if it won't compile/work...

Hope this is of use to somebody...

Peter Maydell.