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From: Brian Norris <computersforpeace@gmail.com>
To: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: linux-mtd@lists.infradead.org
Subject: Re: [PATCH 1/3] mtd_debug: report ecc layout
Date: Wed, 10 Aug 2011 10:07:53 -0700	[thread overview]
Message-ID: <CAN8TOE-H9f9=DtamWPHTLbCJQBnGpeOJDtcXo18nkdC-d8WB7A@mail.gmail.com> (raw)
In-Reply-To: <e51a260aa56112648b5413c66d4036e489ae09f7.1312922073.git.bengardiner@nanometrics.ca>

On Tue, Aug 9, 2011 at 1:57 PM, Ben Gardiner <bengardiner@nanometrics.ca> wrote:
> Add the ECC size and OOB available to that list. The other entries in the
> ecclayout struct are arrays and are not as meaningful as eccsize and oobavail.
> ---
> I noticed that the struct nand_ecclayout_user and its corresponding ioctl
> has been marked deprecated; however, since this is a 'debug' utility and at
> least one person found it useful I thought it would be a good idea to propose
> these changes anyways.

While I agree with your rationale for ignoring the deprecation (it's
OK for a debug utility), users of this feature should be warned that
struct nand_ecclayout_user will not report all information if there
are more ECC entries than "MTD_MAX_ECCPOS_ENTRIES" (i.e., 64). It will
simply truncate ECC at 64. This may be a problem for large page flash
with large ECC regions. It's a similar story for "oobavail" as well.

And before the question is asked, I'm not sure how to implement my
suggestion that "users of this feature should be warned". Perhaps just
a comment in the code?

Brian

  reply	other threads:[~2011-08-10 17:08 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-09 20:38 [PATCH 0/3] mtd-utils: bit errors in nandtest Ben Gardiner
2011-08-09 20:57 ` [PATCH 1/3] mtd_debug: report ecc layout Ben Gardiner
2011-08-10 17:07   ` Brian Norris [this message]
2011-08-10 17:52     ` Ben Gardiner
2011-08-17  8:32     ` Artem Bityutskiy
2011-08-17  8:03   ` Artem Bityutskiy
2011-08-18 14:01     ` Ben Gardiner
2011-08-22 11:00       ` Artem Bityutskiy
2011-08-22 13:11         ` Ben Gardiner
2011-08-09 20:57 ` [PATCH 2/3] nandtest: print number of bits corrected during test Ben Gardiner
2011-08-25 11:00   ` Artem Bityutskiy
2011-08-09 20:57 ` [PATCH 3/3] nandtest: report estimated BER Ben Gardiner

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