linux-kernel - Re: [PATCH 1/4] mtd: add a new field to mtd

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Date:	Wed, 15 May 2013 10:47:44 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Huang Shijie <b32955@...escale.com>
Cc:	dwmw2@...radead.org, computersforpeace@...il.com,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] mtd: add a new field to mtd_info{}

On Fri, 2013-05-03 at 14:21 +0800, Huang Shijie wrote:
> In order to implement the NAND boot for some Freescale's chips, such as
> imx23/imx28/imx50/imx6, we use a tool (called kobs-ng) to burn the uboot
> and some metadata to nand chip. And the ROM code will use the metadata to
> configrate the BCH, and to find the uboot.
> 
> The ECC information(ecc step size, ecc strength) which is used to configrate
> the BCH is part of the metadata. The kobs-ng can gets the ecc strength from
> the sys node /sys/*/ecc_strength now. But it can not gets the ecc step size.
> 
> This patch adds a new field to store the ecc step size in mtd_info{}, and
> it makes preparation for the next patches.
> 
> Signed-off-by: Huang Shijie <b32955@...escale.com>
> ---
>  include/linux/mtd/mtd.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index 183a304..b93035f 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -173,6 +173,9 @@ struct mtd_info {
>  	/* ECC layout structure pointer - read only! */
>  	struct nand_ecclayout *ecclayout;
>  
> +	/* the ecc step size. */
> +	unsigned int ecc_size;

It would really be nice to harmonize the naming and probably stick to
ecc_step everywhere. To me things looks confusing, because ecc_size is
actually ECC step size, and not the size of ECC codes.

-- 
Best Regards,
Artem Bityutskiy

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