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From: John Baldwin <jhb@freebsd.org>
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Cc: 
Subject: Re: Booting from freebsd-boot on gpt using zfs root on mbr
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On Saturday, April 09, 2011 4:32:50 pm Bruce Cran wrote:
> Hi,
> 
> I'm trying to boot from gpt but with the zfs root on a mbr disk so I
> can avoid overwriting the mbr bootcode on ada0.  The
> layout is:
> 
> ada0s4: freebsd-zfs 80 GB (zroot)
> ada1p1: freebsd-boot 128 kB
> 
> When I enter "zroot:/boot/kernel/kernel" at the boot: prompt I get a
> register dump followed by "BTX halted". Is there some way to get this
> configuration to work?

Which prompt is this at (the gptzfsroot prompt or the loader prompt)?
Also, can you grab a snapshot of the register dump?

-- 
John Baldwin