linux-kernel - Re: [PATCH v5 00/11] mtd: add datasheet's ECC information to nand

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Message-ID: <1368612357.15764.26.camel@sauron.fi.intel.com>
Date:	Wed, 15 May 2013 13:05:57 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Huang Shijie <b32955@...escale.com>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 00/11] mtd: add datasheet's ECC information to
 nand_chip{}

On Wed, 2013-05-15 at 16:40 +0800, Huang Shijie wrote:
> 1.) Why add the ECC information to the nand_chip{} ?
>    Each nand chip has its requirement for the ECC correctability, such as
>    "4bit ECC for each 512Byte" or "40bit ECC for each 1024Byte".
>    This ECC info is very important to the nand controller, such as gpmi.
> 
>    Take the Micron MT29F64G08CBABA for example, its geometry is
>    8k page size, 744 bytes oob size and it requires 40bit ECC per 1K bytes.
>    If we do not provide the ECC info to the gpmi nand driver, it has to
>    calculate the ECC correctability itself. The gpmi driver will gets the 56bit
>    ECC for per 1K bytes which is beyond its BCH's 40bit ecc capibility.
>    The gpmi will quits in this case. But in actually, the gpmi can supports
>    this nand chip if it can get the right ECC info.

Thanks. Brian has disappeared, may be busy, but I would still like to
wait for his response. At the very least, I would like to make sure he
does not object.

-- 
Best Regards,
Artem Bityutskiy

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