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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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