itojun@iijlab.net said:
> 	Do people dislike it very much if I add -DSUPPORT_SERIAL=CONSDEV_AUTO
> 	and friends into default compilation of
> 	src/sys/arch/i386/stand/biosboot/Makefile? 

I don't think it's a good idea. That's why biosboot_com0 is there.

> Does it do something harmful?

It can pick a serial console in the wrong moment. Eg, if
you have a serial mouse connected.

The existance of different biosboot* versions is kind of a workaround
for the lack of non-volatile storage on PCs.

best regards
Matthias