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Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in default ECC read functions

From	Richard Weinberger <richard@nod.at>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in default ECC read functions
Date	2015-08-04 09:30 +0200
Message-ID	<pTEPE-3ES-15@gated-at.bofh.it> (permalink)
References	(9 earlier) <pTlWG-1pW-13@gated-at.bofh.it> <pTnlM-3kJ-37@gated-at.bofh.it> <pTo89-4v1-3@gated-at.bofh.it> <pTtKx-4bA-7@gated-at.bofh.it> <pTEwh-3hI-9@gated-at.bofh.it>
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Andrea,

Am 04.08.2015 um 09:02 schrieb Andrea Scian:
>> I'm not sure whether introducing a read-before-write check is the best solution.
>> At least we need hard numbers for slow/old SLC NANDs too.
> 
> We can enable the feature only for MLC, AFAIK it has not been required for old SLC ;-)

I think this needs more discussion.

Boris, Brian, will you be at Embedded Linux Conference Europe in Dublin?
Maybe we can discuss these issues (data retention, ff-checks, etc...) in person and figure out where to address them.
I really want to avoid ad-hoc solutions. :)

> Thanks.
> In your opinion, enabling chk_io is correct to rough estimate the overhead or does it enable too much checks?

You mean the other checks bedside of self_check_write()? You can comment them out for your tests.

Thanks,
//richard
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Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Andrea Scian <rnd4@dave-tech.it> - 2015-07-31 18:20 +0200
  Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Boris Brezillon <boris.brezillon@free-electrons.com> - 2015-07-31 18:30 +0200
    Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Andrea Scian <rnd4@dave-tech.it> - 2015-08-03 13:20 +0200
      Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Boris Brezillon <boris.brezillon@free-electrons.com> - 2015-08-03 14:50 +0200
        Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Andrea Scian <rnd4@dave-tech.it> - 2015-08-03 15:40 +0200
          Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Richard Weinberger <richard@nod.at> - 2015-08-03 21:40 +0200
            Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Andrea Scian <rnd4@dave-tech.it> - 2015-08-04 09:10 +0200
              Re: [RFC PATCH 2/2] mtd: nand: use nand_check_erased_ecc_chunk in  default ECC read functions Richard Weinberger <richard@nod.at> - 2015-08-04 09:30 +0200

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