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

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Message-ID: <A765B125120D1346A63912DDE6D8B6310BF4D4C6@NTXXIAMBX02.xacn.micron.com>
Date:	Wed, 30 Sep 2015 05:31:43 +0000
From:	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>
To:	Richard Weinberger <richard@....at>,
	"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>,
	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

> 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

Hi, Richard
Thanks for your concern. I am a new patch submitter.
Can you tell me Nacked-by means?

By the way, Do you review my patches series ? I don't backup duplicated data in OOB .
Can you specify which sector codes ? so that I can explain it in detail.
Thanks.