From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754022Ab1ANLoF (ORCPT ); Fri, 14 Jan 2011 06:44:05 -0500 Received: from mail-wy0-f174.google.com ([74.125.82.174]:34498 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752068Ab1ANLn5 (ORCPT ); Fri, 14 Jan 2011 06:43:57 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version:content-type; b=d3HfJCq5HreeNSOpW4r+xLO1x2LPXEX8rV4CE1U93ZFqsHQgjT/I4oNzHmnCtlR1my UcNRE1HtjGEqk5nH+skc4Ajh/V0XnE/4MSBFP/xphXVlbL8W7XrBvrzj5C20Y5Tv9tV8 Vd+h83nejbi5di8oA9nsnWMTmCl1RKPBCX/J8= From: Peter Korsgaard To: Hong Xu Cc: linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, nicolas.ferre@atmel.com Subject: Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash References: <1294997687-12515-1-git-send-email-hong.xu@atmel.com> Date: Fri, 14 Jan 2011 12:43:52 +0100 In-Reply-To: <1294997687-12515-1-git-send-email-hong.xu@atmel.com> (Hong Xu's message of "Fri, 14 Jan 2011 17:34:47 +0800") Message-ID: <878vynww07.fsf@macbook.be.48ers.dk> User-Agent: Gnus/5.110009 (No Gnus v0.9) Emacs/22.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "Hong" == Hong Xu 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 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