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From: John Baldwin <jhb@freebsd.org>
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Subject: Re: 9.1-RELEASE AMD64 crash under VBox 4.2.6 when IO APIC is disabled
Date: Mon, 11 Feb 2013 16:06:06 -0500
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 (bigwig.baldwin.cx); Mon, 11 Feb 2013 16:12:10 -0500 (EST)
Cc: CeDeROM <cederom@tlen.pl>
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On Sunday, February 10, 2013 1:16:16 pm CeDeROM wrote:
> Hey :-) I have just noticed that booting installation media for
> FreeBSD 9.1-RELEASE AMD64 from ISO bootonly under VirtualBox 4.2.6
> results in a kernel panic both when ACPI is enabled and disabled in
> the boot dialog screen (seems different cause of crash), when IO APIC
> is disabled in VBox (which is a default). I thought AMD64 is not
> related to APIC..?
> Best regards :-)
> Tomek

You will need to add 'device atpic' to your kernel config and build a custom 
kernel.  All real amd64-capable hardware has APICs.

-- 
John Baldwin