On Mon, Jan 17, 2011 at 05:08:42PM +0000, Prasad Joshi wrote:
> >> [ 13.132547] AMD-Vi: Event logged [IO_PAGE_FAULT device=06:00.1
> >> domain=0x0000 address=0x00000000bb402000 flags=0x0050]
Ok, the problem is, that the device 06:00.1 is not described in the
ACPI table for the IOMMU driver. So the driver does not feel responsible
for it and does not create mappings. It just blocks all DMA from that
device which results in the IO_PAGE_FAULT you have seen.
You will not be able to use the IDE controler in DMA mode, so if you
attach any drives to it you are sticked to slow PIO access mode. The
problem was already seen by another person and he reported the issue to
the board manufacturer to get a new BIOS where this issue is fixed.
Regards,
Joerg
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