linux-kernel - Re: [PATCHv2 1/1] mtd: gpmi: make blockmark swapping optional

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Date:	Fri, 28 Mar 2014 10:00:23 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Huang Shijie <b32955@...escale.com>
Cc:	Lothar Waßmann <LW@...O-electronics.de>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Mark Rutland <mark.rutland@....com>,
	Brian Norris <computersforpeace@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>, Arnd Bergmann <arnd@...db.de>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	linux-mtd@...ts.infradead.org, Shawn Guo <shawn.guo@...escale.com>,
	Rob Landley <rob@...dley.net>,
	Kumar Gala <galak@...eaurora.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2 1/1] mtd: gpmi: make blockmark swapping optional

On Fri, Mar 28, 2014 at 04:39:00PM +0800, Huang Shijie wrote:
> 于 2014年03月28日 16:16, Lothar Waßmann 写道:
> >Still there is no need for the Linux NAND driver to be able to read or
> >write partitions in a format that the Boot ROM can understand. Thus it
> If you do not use the NAND boot, there really no need to do so.
> 
> Since you need the NAND boot, we should enable the swapping for imx28.
> >is perfectly legal to allow disregarding the BB marks and solely rely on
> >a flash based BBT.
> >
> The BB mark is in the page 0 of a NAND block. But the swapping can
> occur in _each_ page of
> a NAND block, _NOT_ only the page 0.
> 
> I think you are confusing at these two things.

I think you are confusing two things. If Lothar:

- disables swapping of BB marks in the FCB the ROM won't swap bytes.
- writes data without swapping
- Uses a DBBT for telling the ROM code where bad blocks are
- uses a Flash BBT for mtd

Then everything should work just fine.

Sascha

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