Date: Wed, 23 Jan 2008 16:14:25 +0100
From: Haavard Skinnemoen <hskinnemoen@atmel.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Marc Pignat <marc.pignat@hevs.ch>, Andrew Victor <linux@maxim.org.za>,
       kernel@avr32linux.org, linux-kernel@vger.kernel.org,
       Remy Bohmer <linux@bohmer.net>, Chip Coldwell <coldwell@redhat.com>
Subject: Re: [PATCH 6/6] atmel_serial: Add DMA support
Message-ID: <20080123161425.203a0159@dhcp-252-066.norway.atmel.com>
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	<20080123150511.3785986c@dhcp-252-066.norway.atmel.com>
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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?

Haavard
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