linux-kernel - Re: [PATCH] mtd: gpmi: make blockmark swapping optional

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Message-ID: <532AC950.6070108@freescale.com>
Date:	Thu, 20 Mar 2014 18:56:16 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	<y@...O-electronics.de>, Arnd Bergmann <arnd@...db.de>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>, <b47714@...escale.com>
Subject: Re: [PATCH] mtd: gpmi: make blockmark swapping optional

于 2014年03月20日 18:09, Lothar Waßmann 写道:
> This can be disabled by parameter in the FCB (at least according to
> the i.MX6 reference Manual):
from imx28's reference manual, there is not such bit in the FCB to 
disable the
swapping. But you are disabling the swapping in the imx28's DTS file, 
isn't it?

I think it is dangerous.



> |DISBBM 172 4 If 0 ROM will swap BadBlockMarkerByte with
> |             metadata[0] after reading a page using BCH40.
> |             If the value set is 1 then ROM will not do
> |             swapping
>
>
I will consult with our ROM colleague about this DISBBM bit.

I am not sure if the ROM still do the swapping for the uboot when we set 
DISBBM bit.

thanks
Huang Shijie


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