I've been having a few problems with the serial port and recent kernels.

Sometimes RiscBSD just hangs when dip starts, but not always. I think it 
may be related to whether I turn the modem on before I boot RiscBSD or 
not... I'm not sure. Atl-Delete then ctrl-D succeeds in partly rebooting 
the machine - its sorta clicks and the floppy drive whirrs a bit but it 
seems to get stuck there. It needs a proper reset before it will restart. 
I can't remember if this happens all the time either...

The most recent kerne(4871?) seems to give the error 'Com port 
initialization failed' or something along those lines, before similarly 
hanging.

-- 
alex@hayward.u-net.com
alexander.hayward@lmh.ox.ac.uk