linux-kernel - Re: [RFC PATCH 1/9] mtd: nand: retrieve ECC requirements from Hynix READ ID byte 4

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Date:	Wed, 05 Feb 2014 14:53:25 +0100
From:	Boris BREZILLON <b.brezillon@...rkiz.com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	dev@...ux-sunxi.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Huang Shijie <b32955@...escale.com>
Subject: Re: [RFC PATCH 1/9] mtd: nand: retrieve ECC requirements from Hynix
 READ ID byte 4

Hello Brian,

On 23/01/2014 02:49, Brian Norris wrote:
> + Huang
>
> Hi Boris,
>
> On Wed, Jan 08, 2014 at 03:21:56PM +0100, Boris BREZILLON wrote:
>> The Hynix nand flashes store their ECC requirements in byte 4 of its id
>> (returned on READ ID command).
>>
>> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
> I haven't verified yet (perhaps Huang can confirm?), but this may be
> similar to a patch Huang submitted recently. In his case, we found that
> this table is actually quite unreliable and is likely hard to maintain.

Indeed (as stated in this thread 
http://comments.gmane.org/gmane.linux.drivers.mtd/50252).
I'll remove this patch from the next version of this series and make use 
of the
nand-ecc-strength /nand-ecc-size DT properties instead.

Thanks.

Best Regards,

Boris
>
> Why do you need this ECC information, for my reference?
>
> Brian

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