On Wed, 06 Jun 2007 11:57:05 -0700
[email protected] 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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