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Date: Wed, 06 Jul 2005 17:33:21 +0100
From: Alex Zbyslaw <xfb52@dial.pipex.com>
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To: Bob Willcox <bob@immure.com>
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Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>, freebsd-questions@freebsd.org
Subject: Re: How do I reinstall the FreeBSD bootmanager?
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Giorgos Keramidas wrote:

>On 2005-07-06 10:27, Bob Willcox <bob@immure.com> wrote:
>  
>
>>I need to reinstall the FreeBSD bootmanager on one of my systems and
>>was hoping someone can point me in the right direction on doing this.
>>I tried running /sbin/sysinstall but decided that I wasn't confident
>>enough of what I was doing to risk trashing my install.
>>    
>>
>
>Its easy.  Just run boot0cfg with the right options :-)
>
>	# boot0cfg -B -v /dev/ad0
>  
>
Depending on the disk and the bootable partitions you might also want 
"-o packet"

             packet  Use the disk packet (BIOS INT 0x13 extensions) 
interface,
                     as opposed to the legacy (CHS) interface, when 
doing disk
                     I/O.  This allows booting above cylinder 1023, but
                     requires specific BIOS support.  The default is
                     `nopacket'.

I believe sysinstall may do this (whether always, or just under specific 
conditions, I cannot say, but when I used boot0cfg without -o packet, I 
couldn't boot partitions which I could boot after a sysinstall).

You can also use sysinstall (as you suggested).  I posted instructions a 
few weeks back so a search should turn them up, if you need them.

--Alex