linux-kernel - Re: [PATCH v3] mtd: nand support for Toshiba BENAND (Built-in ECC NAND)

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Message-ID: <20150724014519.GG8876@google.com>
Date:	Thu, 23 Jul 2015 18:45:19 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	KOBAYASHI Yoshitake <yoshitake.kobayashi@...hiba.co.jp>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mtd: nand support for Toshiba BENAND (Built-in ECC
 NAND)

On Fri, Jul 24, 2015 at 09:52:18AM +0900, KOBAYASHI Yoshitake wrote:
> This patch enables support for Toshiba BENAND. BENAND is a SLC NAND
> solution that automatically generates ECC inside NAND chip.
> 
> I considered to use the patch of on-die ECC, but I believe reading twice
> the same page approach will affect read performance. Additionally, BENAND
> does not support Disable ECC. So, I cannot use same approach.
> 
> BENAND Read Status CMD(70h) is able to report Rewrite Recommend. BENAND
> also has extended ECC Status CMD(7Ah). This command is able to report the
> number of bit error/sector data. When MTD_NAND_BENAND_ENABLE option enabled,
> this driver use the extended ECC status CMD(7Ah) to report real number of
> bitflips. In case of difficult to use CMD(7Ah), this driver use
> "mtd->bitflip_threshold" to assume the number of bitflips.
> 
> Signed-off-by: KOBAYASHI Yoshitake <yoshitake.kobayashi@...hiba.co.jp>
> ---

Where's the changelog? I see that this is version 3...

Brian
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