Messages in this thread | | | Date | Wed, 23 Jan 2008 16:41:50 +0000 | From | Alan Cox <> | Subject | Re: [PATCH 6/6] atmel_serial: Add DMA support |
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On Wed, 23 Jan 2008 16:14:25 +0100 Haavard Skinnemoen <hskinnemoen@atmel.com> wrote:
> On Wed, 23 Jan 2008 15:04:36 +0000 > Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: > > > > No, I think GFP_DMA is for legacy ISA DMA and other DMA controllers > > > with addressing limitations. The PDC is capable of accessing the full > > > 32-bit physical address space on both AT91 and AVR32, so no special DMA > > > flags are needed. > > > > For kernel coherent DMA buffers use the dma_ API to allocate the memory. > > Yes, but since we're managing DMA coherency using the streaming DMA > API, we don't really need coherent buffers, right?
Right.
Alan
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