Messages in this thread | | | Date | Sun, 20 Jun 2004 16:50:42 +0100 | From | Ian Molton <> | Subject | Re: DMA API issues |
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On 20 Jun 2004 08:37:58 -0500 James Bottomley <James.Bottomley@SteelEye.com> wrote:
> > There's no architecture currently that can't use the DMA API. > > The modification you propose, to make on chip memory visible as normal > memory can't be done on the IBM iserie, AS/400 as I said in the the > email you quote:
Those two statements are contradictory. clearly the iseries cant use the DMA API *now* so I dont see how that makes any difference. We're talking about adding propper support for *addresssable* memory mapped devices with limited size DMA-able windows to the DMA API, not adding support for a whole new weird way of talking to devices. These devices work the same way as all the other devices that use the DMA API but are simply restricted in the range of addresses they can DMA from. they require no special 'accessors'.
iseries cant work the usual way now and wont with these modifications - so nothing is made worse. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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