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SubjectRe: [Intel-IOMMU 07/10] Intel iommu cmdline option - forcedac
On Wed, 06 Jun 2007 11:57:05 -0700
anil.s.keshavamurthy@intel.com wrote:

> --- linux-2.6.22-rc3.orig/Documentation/kernel-parameters.txt 2007-06-04 12:40:29.000000000 -0700
> +++ linux-2.6.22-rc3/Documentation/kernel-parameters.txt 2007-06-04 12:40:41.000000000 -0700
> @@ -785,6 +785,13 @@
> bypassed by not enabling DMAR with this option. In
> this case, gfx device will use physical address for
> DMA.
> + forcedac

You want
forcedac [X86-64]

> + With this option iommu will not optimize to look
> + for io virtual address below 32 bit forcing dual
> + address cycle on pci bus for cards supporting greater
> + than 32 bit addressing. The default is to look
> + for translation below 32 bit and if not available
> + then look in the higher range.

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