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Date: Sun, 23 Jun 2013 21:39:14 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Doug Hardie <bc979@lafn.org>
Subject: Re: Boot Loader Issue
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On Sun, 23 Jun 2013, Doug Hardie wrote:

> I had to convert a system from GPT to MBR.  All went fine till I tried 
> to reboot the system.  It gets to mountroot and dies trying to mount 
> from ufs:/dev/ada0p2.  That won't work.

The loader should be getting that information from /etc/fstab.  Have the 
entries there been changed?

> If I enter ufs:/dev/ada0s1a then the system boots fine and runs.  I 
> need to alter mountroot so it tries the right partition/slice.  How do 
> I do that?  I couldn't find anything in the handbook on that.

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/boot-blocks.html 
has some information.