linux-kernel - Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash

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Message-ID: <878vynww07.fsf@macbook.be.48ers.dk>
Date:	Fri, 14 Jan 2011 12:43:52 +0100
From:	Peter Korsgaard <jacmet@...site.dk>
To:	Hong Xu <hong.xu@...el.com>
Cc:	linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	nicolas.ferre@...el.com
Subject: Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash

>>>>> "Hong" == Hong Xu <hong.xu@...el.com> writes:

 Hong> Some SAM9 chips have the ability to perform DMA between CPU and
 Hong> SMC controller.  This patch adds DMA support for SAM9RL, SAM9G45,
 Hong> SSAM9G46,AM9M10, SAM9M11.

 Hong> Signed-off-by: Hong Xu <hong.xu@...el.com>

But mtd buffers are not guaranteed to be DMA safe (E.G. might come from
vmalloc), so you'll need to walk the page tables.

-- 
Bye, Peter Korsgaard
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