VT-d / iommu problem on Intel S3210SH

[Mateusz Murawski]

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.
Thanks
M.Murawski
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