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Date: Tue, 13 Sep 2011 12:56:01 +0200
From: Maarten Lankhorst <m.b.lankhorst@gmail.com>
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To: Mateusz Murawski <matowy@tlen.pl>
CC: linux-kernel@vger.kernel.org
Subject: Re: VT-d / iommu problem on Intel S3210SH
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Hey Mateusz,

On 09/12/2011 03:22 PM, Mateusz Murawski wrote:
> Hi
> I have problem with Intel VT for Directed I/O.
> When I enable this option in bios, my system (Fedora 15) can't start.
> Kernel 2.6.40.4-5.fc15.x86_64
> Bios S3200X38.86B.00.00.0052
>
> Last lines from dmesg
>
> [    5.357181] DRHD: handling fault status reg 3
> [    5.358179] DMAR:[DMA Write] Request device [02:08.0] fault addr ffe8a000
> [    5.358179] DMAR:[fault reason 02] Present bit in context entry is clear
> [   24.087406] dracut Warning: No root device "block:/dev/disk/by-uuid/1c624f0d-4593-4653-a4ce-b7af80d549ff" found
>
> Full dmesgs
> dmesg_bad_2.6.40 VT-d enable http://pastebin.com/AXAByHBh
> dmesg_good_2.6.40 VT-d enable iommu=off http://pastebin.com/8zrMRiin
>
> Please let me know if you need more information. I have access by serial console.
>
Does that cpu have vt-d support?

http://ark.intel.com/products/35432 doesn't list it. If you enable it
for the mainboard, but cpu has no support, weird things happen.

For comparison a cpu that does:
http://ark.intel.com/products/52209

~Maarten