From owner-freebsd-current@FreeBSD.ORG  Wed Apr 15 23:43:59 2009
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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Diego Depaoli <trebestie@gmail.com>
Date: Wed, 15 Apr 2009 19:43:47 -0400
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Subject: Re: AMD 780G chipset major issues 3/3 (btx)
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On Wednesday 15 April 2009 07:27 pm, Diego Depaoli wrote:
> On Wed, Apr 15, 2009 at 2:38 PM, John Baldwin <jhb@freebsd.org> 
wrote:
> > This fault is with the old boot blocks still.  'bsdlabel -B
> > ad4s4' should update the boot blocks correctly.  I'm not sure why
> > you are still getting the old code.  Perhaps /boot/boot has not
> > been updated?
>
> I remaked world/kernel. Almost all files in /boot have same
> date/time. That's the output of bsdlabel -B ad4s4
> partition a: offset past end of unit
> partition a: partition extends past end of unit
> partition b: offset past end of unit
> partition b: partition extends past end of unit
> partition c: offset past end of unit
> partition c: partition extends past end of unit
> bsdlabel: partition c doesn't start at 0!
> bsdlabel: An incorrect partition c may cause problems for standard
> system utilities
> partition d: offset past end of unit
> partition d: partition extends past end of unit
> partition e: offset past end of unit
> partition e: partition extends past end of unit
> partition f: offset past end of unit
> partition f: partition extends past end of unit
>
> After reboot I get BTX halted.
> Perhaps bsdlabel -B works only upon a slice with 0X80 flag set?
> Otherwise I don't know...

It only works when there is no error. ;-) It seems you have to fix the 
label first.

Jung-uk Kim