From owner-freebsd-hackers@FreeBSD.ORG  Wed Jan 11 09:07:35 2006
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To: John Baldwin <jhb@freebsd.org>
In-reply-to: Your message of Tue, 10 Jan 2006 13:49:53 -0500 .
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Date: Wed, 11 Jan 2006 10:58:32 +0200
From: Danny Braniss <danny@cs.huji.ac.il>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: pxeboot and serial console 
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> On Tuesday 10 January 2006 09:11 am, Danny Braniss wrote:
> > I can't tell when this broke, but compiling pxeboot with
> > BOOT_PXELDR_PROBE_KEYBOARD set would redirect the console to the serial
> > port if no keyboard was detected. This no longer works, which explains
> > the problems i had with the serial port on my intel 1U servers.
> >
> > the relevant code is in /sys/boot/i386/pxeldr/pxeldr.S.
> >
> > compiling with BOOT_PXELDR_ALWAYS_SERIAL works as expected, so IMHO
> > the test:
> > 	testb $KEYBOARD_BIT, MEM_BIOS_KEYBOARD # keyboard present?
> > is failing, but i have no idea why
> >
> > any ideas?
> 
> USB keyboards?  Actually, it sounds in your case as if the BIOS is always 
> claiming a keyboard is present. Perhaps your BIOS is just being lame, but 
> that single test isn't the greatest test to use either.

2 words: Power Cycle
This will guarantee that the bios will/won't detect the keyboard.
all is ok now.