Messages in this thread | | | Date | Sun, 13 Sep 2009 23:36:10 -0600 | From | Grant Grundler <> | Subject | Re: problems doing direct dma from a pci device to pci-e device |
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On Fri, Sep 11, 2009 at 04:04:00PM -0400, Mark Hounschell wrote: > A quick readup on the IOMMU makes me think that if it does use one, that > could certainly cause my problem. I'm using bus addresses plugged into > page tables that live in the gpiohsd card obtained from virt2bus.
If you haven't yet, take a look at Documentation/DMA-API.txt and DMA-mapping.txt . virt2bus has been deprecated for DMA since 2.4 releases.
grant
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