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

From: Bean Huo 霍斌斌 (beanhuo)
Date: Wed Sep 30 2015 - 01:33:48 EST

> 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@xxxxxx>
> 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.