[CentOS] IOMMU error at boot time

Fri Oct 18 19:26:55 UTC 2013
Fred Smith <fredex at fcshome.stoneham.ma.us>

Hi all!

I've just recently noticed these lines in the dmesg output:

	Please enable the IOMMU option in the BIOS setup
	This costs you 64 MB of RAM

they may have been there forever, but I never noticed them before.
This system is an AMD Phenom-II X2 CPU on a Gigabyte MA770-UD3 motherboard.

I have no idea which BIOS option I need to change to solve this, I see
nothing in the setup that refers to IOMMU.

Clues, please?

thanks!

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