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    SubjectRe: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups
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    On Mer, 2005-03-16 at 14:31, Christoph Hellwig wrote:
    > It's bogus either way. You must never use virt_to_phys or virt_to_bus
    > for bus address. For systems with an IOMMU there's no 1:1 mapping.

    The AGPGART _is_ the IOMMU.

    Alan

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