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

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Date:	Wed, 26 Mar 2014 18:41:43 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	Fabio Estevam <fabio.estevam@...escale.com>,
	Mark Rutland <mark.rutland@....com>,
	Shawn Guo <shawn.guo@...aro.org>,
	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>,
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Landley <rob@...dley.net>,
	Kumar Gala <galak@...eaurora.org>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCHv2 1/1] mtd: gpmi: make blockmark swapping optional

于 2014年03月26日 16:51, Lothar Waßmann 写道:
> I don't see why this should not be supported on i.MX28 (i.MX23 doesn't
> do byteswapping anyway, so this wouldn't change anything for i.MX23).
> The partitions used by Linux need not necessarily be accessible for the
> Boot ROM code (and vice versa).
But the first partition used to store the u-boot is accessible for the ROM.

Please see "Figure 12-13" in the 12.12.1.12:
   "In order to preserve the BI (bad block information), flash updater 
or gang programmer
applications need to swap Bad Block Information (BI) data to byte 0 of 
metadata area for
every page before programming NAND Flash. ROM when loading firmware, 
copies back
the value at metadata[0] to BI offset in page data. The following figure 
shows how the
factory bad block marker is preserved."

So please the imx28 should _NOT_ support this feature.

thanks
Huang Shijie



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