Messages in this thread | | | Date | Mon, 31 Jan 2000 16:02:16 +0100 | From | Jakub Jelinek <> | Subject | Re: Updated 2.3.x job list (its getting shorter) |
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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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