linux-kernel - Re: [PATCH 0/9] drivers:mtd:UBI: add bakvol module for MLC NAND paired page issue

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Date:	Tue, 29 Sep 2015 11:28:24 +0200
From:	Richard Weinberger <richard@....at>
To:	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>, "dedekind1@...il.com" <dedekind1@...il.com>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"baruch@...s.co.il" <baruch@...s.co.il>,
	"asierra@...-inc.com" <asierra@...-inc.com>,
	"guz.fnst@...fujitsu.com" <guz.fnst@...fujitsu.com>,
	"gsi@...x.de" <gsi@...x.de>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Frank Liu 刘群 (frankliu) 
	<frankliu@...ron.com>, Andrea Scian <rnd4@...e-tech.it>,
	Peter Pan 潘柏宏 (peterpan) 
	<peterpan@...ron.com>,
	Karl Zhang 张双锣 (karlzhang) 
	<karlzhang@...ron.com>,
	Iwo Mergler <Iwo.Mergler@...commwireless.com>,
	"Jeff Lauruhn (jlauruhn)" <jlauruhn@...ron.com>,
	Stefan Roese <sr@...x.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/9] drivers:mtd:UBI: add bakvol module for MLC NAND
 paired page issue

Hi!

Am 28.09.2015 um 09:02 schrieb Bean Huo 霍斌斌 (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 <richard@....at>

Sorry,
//richard
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