Messages in this thread | | | Subject | Re: [PATCH v5 01/11] mtd: add datasheet's ECC information to nand_chip{} | From | Artem Bityutskiy <> | Date | Thu, 16 May 2013 10:14:25 +0300 |
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On Thu, 2013-05-16 at 10:16 +0800, Huang Shijie wrote: > 于 2013年05月15日 20:11, Artem Bityutskiy 写道: > > On Wed, 2013-05-15 at 16:40 +0800, Huang Shijie wrote: > >> + * @ecc_strength: [INTERN] ECC correctability from the datasheet. > >> + * Minimum amount of bit errors per @ecc_step guaranteed to > >> + * be correctable. If unknown, set to zero. > >> + * @ecc_step: [INTERN] ECC step required by the @ecc_strength, > >> + * also from the datasheet. It is the recommended ECC step > >> + * size, if known; if unknown, set to zero. > > Here and in other places you talk about "datasheet". Do you assume that > > the real ECC strength/step used by NAND chips may be different? Or you > > assume it must be the same? > > > The two fields are used to store the ecc info from the datasheet. > The two fields are just for a reference. > > [1] The nand controller may do not use these two fields, it's ok; > For example, the datasheet requires "4bits per 512 bytes". > The nand controller can uses 8bits per 512 bytes. > > > [2] but sometimes the nand controller must use these two fields. > For example, the datasheet requires "40bits per 1024 bytes". > For the hardware limit, the nand controller(BCH) may supports the > 40bits ecc in the maximum. > So the nand controller must use these two fields now.
I wonder if it makes sense to name things so that it is clear form the names whether that is the "theoretical" datasheet values or the real ones. I would prefer to clearly distinguish between them, in names and comments. Thoughts?
-- Best Regards, Artem Bityutskiy
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