From owner-freebsd-amd64@FreeBSD.ORG  Wed Apr  7 01:07:35 2004
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Date: Wed, 07 Apr 2004 02:31:13 -0500
From: "James R. Van Artsalen" <james@jrv.org>
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To: Georges-Andre Silber <silber@cri.ensmp.fr>
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Subject: Re: SMP problems Bi-Opteron/HDAMA
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Georges-Andre Silber wrote:

> surville# diff GENERIC SURVILLE
> 23c23
> < ident         GENERIC
> ---
> > ident         SURVILLE
>
> As you can see, no big changes :-)
> I don't know what to do with my kernel to activate ACPI by default...


See if FreeBSD/i386 sees both processors.  In particular, see if 
FreeBSD/i386 detects ACPI or the APIC.

See if there is a newer BIOS for that motherboard.

See if ACPI is disabled in ROM setup.

My theory is that FreeBSD/amd64 is OK and that BIOS for whatever reason 
it not presenting ACPI correctly.