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Date: Mon, 27 Jun 2011 07:40:15 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Kurt Buff <kurt.buff@gmail.com>
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	(wonkity.com [127.0.0.1]); Mon, 27 Jun 2011 07:40:16 -0600 (MDT)
Cc: FreeBSD Questions <questions@freebsd.org>
Subject: Re: fubar'ed it good this time...
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On Sun, 26 Jun 2011, Kurt Buff wrote:

> Sitrep: Lenovo T61, dual booting WinXP and FreeBSD (amd64 8.1-RELEASE)
> on a 500gb drive. Just did a freebsd-update from 8.1 to 8.2, just
> doing the second boot to do 'freebsd-update install' for the second
> time, and got dumped into the mountroot prompt.
>
> AFAICT, I managed somehow to write something strange into /etc/fstab.
> Can't tell what it is, because during boot it passes by too quickly
> for me to read, and the boot process dumps me into the mountroot
> prompt.

Scroll Lock and Page Up/Down should work there to scroll back to see the 
disk device numbers.

> WinXP still boots just fine, and the FreeBSD boot manager is in place,
> and was working before the update.
>
> FreeBSD was booting just fine from /dev/ad0s2a, prior to running freebsd-update.

Don't know what would cause that.  Custom kernels could have the 
ATA_STATIC_ID option removed, which might give the disk a different 
number, ad2 or ad4 usually.

The BIOS could have AHCI mode set, but that should not change with 8.2. 
That would make the disk ada0.

I second the suggestion of mfsBSD.