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    SubjectRe: Updated 2.3.x job list (its getting shorter)
    On Mon, Jan 31, 2000 at 02:46:13PM +0000, David Woodhouse wrote:
    >
    > lkd@tantalophile.demon.co.uk said:
    > > How much hardware can do _ISA_ scatter/gather DMA?
    >
    > Depends on how clever the motherboard chipset / ISA bridge is.
    >
    > Any DMA-capable ISA card in an Alpha, for example, is quite happily capable
    > of scatter/gather DMA, and it doesn't even have to know a thing about it.
    >
    > The PCI/ISA bridge will perform any mapping it's asked to - but at the moment
    > Linux doesn't use that capability, and just sets up a static mapping to the
    > first 16Mb of RAM, AFAIK

    It does in 2.3.41, at least on UltraSPARC. See Documentation/DMA-mapping.txt.
    Richard Henderson has patches to make this work on Alpha as well, but it probably
    needs there some more debugging and testing.

    Cheers,
    Jakub
    ___________________________________________________________________
    Jakub Jelinek | jakub@redhat.com | http://sunsite.mff.cuni.cz/~jj
    Linux version 2.3.41 on a sparc64 machine (1343.49 BogoMips)
    ___________________________________________________________________

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