linux-kernel - Re: [PATCH v2 1/5] mtd: nand: Create a BBT flag to access bad block markers in raw mode

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Message-ID: <20150724190106.GD24646@qualcomm.com>
Date:	Fri, 24 Jul 2015 14:01:06 -0500
From:	Andy Gross <agross@...eaurora.org>
To:	Archit Taneja <architt@...eaurora.org>
Cc:	linux-mtd@...ts.infradead.org, dehrenberg@...gle.com,
	cernekee@...il.com, computersforpeace@...il.com,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] mtd: nand: Create a BBT flag to access bad block
 markers in raw mode

On Tue, Jul 21, 2015 at 04:04:42PM +0530, Archit Taneja wrote:
> Some controllers can access the factory bad block marker from OOB only
> when they read it in raw mode. When ECC is enabled, these controllers
> discard reading/writing bad block markers, preventing access to them
> altogether.
> 
> The bbt driver assumes MTD_OPS_PLACE_OOB when scanning for bad blocks.
> This results in the nand driver's ecc->read_oob() op to be called, which
> works with ECC enabled.
> 
> Create a new BBT option flag that tells nand_bbt to force the mode to
> MTD_OPS_RAW. This would result in the correct op being called for the
> underlying nand controller driver.
> 
> Signed-off-by: Archit Taneja <architt@...eaurora.org>
> ---


Reviewed-by: Andy Gross <agross@...eaurora.org>

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