linux-kernel - Re: [PATCH 6/6] atmel

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Message-ID: <20080123150511.3785986c@dhcp-252-066.norway.atmel.com>
Date:	Wed, 23 Jan 2008 15:05:11 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Marc Pignat <marc.pignat@...s.ch>
Cc:	Andrew Victor <linux@...im.org.za>, kernel@...32linux.org,
	linux-kernel@...r.kernel.org, Remy Bohmer <linux@...mer.net>,
	Chip Coldwell <coldwell@...hat.com>
Subject: Re: [PATCH 6/6] atmel_serial: Add DMA support

On Wed, 23 Jan 2008 14:52:55 +0100
Marc Pignat <marc.pignat@...s.ch> wrote:

> On Wednesday 23 January 2008, Haavard Skinnemoen wrote:
> > On Wed, 23 Jan 2008 14:18:38 +0100
> ...
> > GFP_DMA doesn't have anything to do with alignment, AFAIK.
> I don't even know if it does something for at91 or avr32, but there is a flag
> for dma memory, so we should use it.

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.

Haavard
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