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From: Vivek Khera <vivek@khera.org>
Date: Thu, 31 Mar 2005 08:41:16 -0500
To: FreeBSD-amd64@freebsd.org
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Subject: Re: Problems with AMD64 and 8 GB RAM?
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On Mar 31, 2005, at 1:18 AM, Greg 'groggy' Lehey wrote:

> On Thursday, 31 March 2005 at  0:00:22 -0600, Jon Noack wrote:
>>
>> My limited research (as in, Google) shows that the MADT was defined as
>> part of ACPI 2.0:
>> http://www.microsoft.com/whdc/system/platform/64bit/IA64_ACPI.mspx
>
> Thanks for the link.
>
>> According to your previous link the motherboard specs, it supports
>> both ACPI 1.0A and 2.0.  Perhaps there is a BIOS knob to toggle
>> between the two?
>
> I've taken a look, but I can't find anything.

I just ran acpidump -t on one of my dual opterons, and it produced no 
MADT info, and I *know* I enabled ACPI 2.0 on it in the BIOS... Tyan 
K8SR.