From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934092AbbI2J2m (ORCPT ); Tue, 29 Sep 2015 05:28:42 -0400 Received: from a.ns.miles-group.at ([95.130.255.143]:11949 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933283AbbI2J2b (ORCPT ); Tue, 29 Sep 2015 05:28:31 -0400 Subject: Re: [PATCH 0/9] drivers:mtd:UBI: add bakvol module for MLC NAND paired page issue To: =?UTF-8?B?QmVhbiBIdW8g6ZyN5paM5paMIChiZWFuaHVvKQ==?= , "dedekind1@gmail.com" , "adrian.hunter@intel.com" , "computersforpeace@gmail.com" , "baruch@tkos.co.il" , "asierra@xes-inc.com" , "guz.fnst@cn.fujitsu.com" , "gsi@denx.de" , Boris Brezillon References: Cc: David Woodhouse , "linux-mtd@lists.infradead.org" , =?UTF-8?B?RnJhbmsgTGl1IOWImOe+pCAoZnJhbmtsaXUp?= , Andrea Scian , =?UTF-8?B?UGV0ZXIgUGFuIOa9mOafj+WujyAocGV0ZXJwYW4p?= , =?UTF-8?B?S2FybCBaaGFuZyDlvKDlj4zplKMgKGthcmx6aGFuZyk=?= , Iwo Mergler , "Jeff Lauruhn (jlauruhn)" , Stefan Roese , "linux-kernel@vger.kernel.org" From: Richard Weinberger X-Enigmail-Draft-Status: N1110 Message-ID: <560A59B8.4000701@nod.at> Date: Tue, 29 Sep 2015 11:28:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=gbk Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! Am 28.09.2015 um 09:02 schrieb Bean Huo »ô±ó±ó (beanhuo): > Hello, > > This series aims at adding a bakvol module for MLC NAND paired page > Power loss protection. > MLC NAND paired page power loss is a known issue so far, MLC NAND pages are > coupled in a sense that if you cut power while writing to a page, you corrupt not only > this page, but also one of the previous pages which is paired with the current one. > Currently, there is no a perfect solution for this. > This paired page solution is based on NAND multiple plane program feature. For this > Patch, only used dual plane page program, means two different plane pages can > Be programmed together at the same time. > Dual plane page program only implements in backup operation. Only lower page data > Be duplicated and back up into a internal log volume by dual plane program method. > > This patch has been testing on Micron 70s/80s/90s MLC NAND. > Of course there are some places needed to be improved and simplified. > > Any suggestion and comments welcomed. As stated before, using OOB in UBI is not going to happen unless proven that there is absolutely no other way to solve the paired pages problem. Nacked-by: Richard Weinberger Sorry, //richard