From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755403Ab3KVLpI (ORCPT ); Fri, 22 Nov 2013 06:45:08 -0500 Received: from top.free-electrons.com ([176.31.233.9]:35178 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753416Ab3KVLpG (ORCPT ); Fri, 22 Nov 2013 06:45:06 -0500 Date: Fri, 22 Nov 2013 08:45:10 -0300 From: Ezequiel Garcia To: Hans Zhang Cc: Richard Genoud , linux-mtd , David Woodhouse , "linux-kernel@vger.kernel.org" , zhouguangming@innofidei.com Subject: Re: [PATCH] Make the mtdblock read/write skip the bad nand sector Message-ID: <20131122114509.GB2414@localhost> References: <1385024065-29965-1-git-send-email-zhanghonghui@innofidei.com> <528EB1E3.7030101@innofidei.com> <20131122015237.GB3509@localhost> <528EBD0B.5010006@innofidei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <528EBD0B.5010006@innofidei.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 22, 2013 at 10:10:19AM +0800, Hans Zhang wrote: > On 2013/11/22 9:52, Ezequiel Garcia wrote: > > On Fri, Nov 22, 2013 at 09:22:43AM +0800, Hans Zhang wrote: > >> On 2013/11/21 18:59, Richard Genoud wrote: > >> > >> Here's my scenario, I want to write nand through mtdblock by dd command > > You could get some better support by explaining why do you want to write > > to a NAND through mtdblock. It sounds a bit ackward to me, but I'm sure > > you have a good reason for it! > > > > Let's hear it :-) > > Thanks for your reply. > This is for my embed system upgrade, I reserved one nand partition for filesystem > environment which will load to DDR while uboot booting. > This filesystem.uboot file should be able to read both by uboot and kernel, and > maybe written by uboot and kernel. There will be no filesystems upon the nand in > case the loader may not support some filesystem types while uboot booting. > > Seems that the trimmed environment of OS has get rid of the mtd-tools, So the dd > command was the most convenience tools to use by hand. > I still don't understand why are you using mtdblock. Why can't you write through the char device? -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com