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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Juergen Lock <nox@FreeBSD.org>
Date: Thu, 1 Feb 2007 15:02:53 -0500
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Cc: freebsd-emulation@FreeBSD.org
Subject: [FIX] QEMU and ACPI
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You may have noticed recent QEMU does not boot FreeBSD/amd64 SMP guest 
on FreeBSD/amd64 -CURRENT host (i.e., you may have seen 'invalid RSDT 
checksum' error while booting).  That is because the QEMU BIOS (which 
is actually Bochs BIOS with little modification) has a little bug in 
it.  If you experience the issue, grab a file from here:

http://people.freebsd.org/~jkim/qemu-bios.bin

and replace /usr/local/share/qemu/bios.bin with it.  The QEMU patch 
against Bochs BIOS is here:

http://people.freebsd.org/~jkim/qemu-bios.diff

Basically it wasn't clearing RSDT before checksum calculation. ;-)

FYI...

Jung-uk Kim