BIOS boot message. How to fix?

To: Debian User List <debian-user@lists.debian.org>
Subject: BIOS boot message. How to fix?
From: Mark Neidorff <mark@neidorff.com>
Date: Wed, 2 Feb 2011 13:29:55 -0500
Message-id: <[🔎] 201102021329.55626.mark@neidorff.com>

I'm running kernel 2.6.26-2-amd64 .  Recently I have started getting this 
informational message on boot:

Your BIOS doesn't have a aperture memory hole.
Please enable the IOMMU option in the BIOS setup.

The BIOS is ASUS M2N PV-VM ACPI BIOS R1201

When I enter BIOS setup, I see no option for enabling the IOMMU option.  
Please tell me what I should be looking for and what I should change it to?

FWIW, the system seems to boot normally.  I have found no glitches, but I like 
to keep ahead of this kind of problem.

Thanks,

Mark

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