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From: Anonymous <swell.k@gmail.com>
To: Joel Dahl <joel@FreeBSD.org>
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Date: Tue, 22 Sep 2009 16:46:59 +0400
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Cc: d@delphij.net, current@freebsd.org, paradox <ddkprog@yahoo.com>
Subject: Re: svn rev 197392 hangs during boot
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Joel Dahl <joel@FreeBSD.org> writes:

>> Before trying to revert it can make sense to try place back u_int32_t
>> cast first
>>
>> [...]
>>> -        p = BIOS_PADDRTOVADDR((regs.R_ES << 4) + regs.R_BX);
>>> +        p = BIOS_PADDRTOVADDR(((u_int32_t)vmf.vmf_es << 4) + vmf.vmf_bx);
>
> No effect. It still hangs at the same place.
>
> I'll try reverting rev 197384 next...

What arch are you using? Can you try on i386 using vm86 (r197383) and
x86bios (r197384).