serial console

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On a particular -current/amd64 box, NetBSD + serial console is
fine, XEN_DOM0 on pc console is fine. However with the following
incantation nothing appears on the end of the serial line, nor on
the screen:

menu=Boot Xen 4.1 debug dom0 (com0):load /netbsd-XEN3_DOM0 
console=com0;multiboot /xen-debug.gz dom0_mem=512M

I can ssh in and all is OK, but I can't see console output...

BIOS and NetBSD bootblocks set baud rate to 115200. I tried 115200 and 9600
in the hope of seeing something. Is the incantation wrong?

Cheers,

Patrick