>Can you send me the configuration changes that need to be done to
>biosboot to enable it to use the serial console?

Let me see ... I don't have 1.3.2 sources on-hand, buuutttt ... IIRC,
the changes need to be made in /sys/arch/i386/stand/biosboot/Makefile
(look at the commented out lines) and you need to change the argument
to initio in biosboot/main.c to something like CONSDEV_AUTO or CONSDEV_COM0.

--Ken