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

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Date:	Fri, 28 Mar 2014 10:01:58 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Huang Shijie <b32955@...escale.com>
Cc:	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

Hi,

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.
>
There is no need for the ROM code to access any other partition than
the bootloader itself. Thus Linux can perfectly well be booted from
NAND without any byte swapping.

> Since you need the NAND boot, we should enable the swapping for imx28.
>
Why? There is no need for Linux to do any swapping when not accessing
the bootloader partition.

> > 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.
> 
No, I'm not confusing anything. The swapping in any other page than
page 0 is completely useless. Thus, when there is no need to recognize
the BB markers, there in no need to do any swapping too.


Lothar Waßmann
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