linux-kernel - Re: [PATCH 5/6] mtd: nand: gpmi: correct bitflip for erased NAND page

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Message-ID: <55B88952.1060709@dave-tech.it>
Date:	Wed, 29 Jul 2015 10:05:38 +0200
From:	Andrea Scian <rnd4@...e-tech.it>
To:	linux-mtd@...ts.infradead.org, Han Xu <b45815@...escale.com>
Cc:	shijie8@...il.com, dwmw2@...radead.org,
	computersforpeace@...il.com, boris.brezillon@...e-electrons.com,
	fabio.estevam@...escale.com, hofrat@...dl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] mtd: nand: gpmi: correct bitflip for erased NAND page

Dear Han Xu,


Il 28/07/2015 19:50, Han Xu ha scritto:
> i.MX6QP and i.MX7D BCH module integrated a new feature to detect the
> bitflip number for erased NAND page. So for these two platform, set the
> erase threshold to gf/2 and if bitflip detected, GPMI driver will
> correct the data to all 0xFF.


That's an iteresting feature of iMX6QP
We were discussing about erased NAND page bitflip in MTD ML a few days ago.

Is gf/2 a right value to choose? Why?
IIUC, in a previuos MTD-level patch [1] Brian used ECC strength as 
threshold.

Could you please also share with which NAND device you tested this patch?

Kind regards and TIA,

-- 

Andrea SCIAN

DAVE Embedded Systems

[1] http://article.gmane.org/gmane.linux.drivers.mtd/52216
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