From: Peter Horton <phorton@bitbox.co.uk>
To: Mike Dunn <mikedunn@newsguy.com>
Cc: linux-mtd@lists.infradead.org, dedekind1@gmail.com
Subject: Re: [PATCH v2] MTD: modify mtd api to return bitflip info on read operations
Date: Mon, 05 Dec 2011 17:09:00 +0000 [thread overview]
Message-ID: <4EDCFAAC.90709@bitbox.co.uk> (raw)
In-Reply-To: <4EDCF840.7050107@newsguy.com>
On 05/12/2011 16:58, Mike Dunn wrote:
> On 12/04/2011 10:07 PM, Artem Bityutskiy wrote:
>> On Sun, 2011-12-04 at 06:55 -0800, Mike Dunn wrote:
>>> So you're thinking that the driver would supply both ecc_strength and
>>> "scrublevel" (or maybe bb_threshold)? Would these go into struct mtd_info?
>> Probably yes. After all, UBI has no idea about what kind of flash is
>> that and what kind of ECC it uses and what bit-flip level needs
>> scrubbing. So I think this kind of information should come from the
>> driver or from the user via mtd sysfs files. What do you think?
>
>
> I'm not a flash expert, but that sounds reasonable, especially if the scrublevel
> parameter is optional, with UBI using ecc_strength as the default value. As for
> how to pass the parameter, sysfs might be a good idea for scrublevel, allowing
> it to be tunable without having to modify the driver if experience show that the
> driver author's original assumptions about how a block degrades were incorrect.
>
Surely the check for "do we need to scrub ?" should be done lower down
otherwise all users of the mtd NAND interface (UBI / JFFS2 etc) are
going to have to re-implement those sysfs files and the corresponding
checks.
P.
next prev parent reply other threads:[~2011-12-05 17:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-03 20:20 [PATCH v2] MTD: modify mtd api to return bitflip info on read operations Mike Dunn
2011-12-04 8:43 ` Peter Horton
2011-12-04 13:52 ` Mike Dunn
2011-12-04 14:43 ` Artem Bityutskiy
2011-12-04 14:55 ` Mike Dunn
2011-12-05 6:07 ` Artem Bityutskiy
2011-12-05 16:58 ` Mike Dunn
2011-12-05 17:09 ` Peter Horton [this message]
2011-12-05 18:57 ` Mike Dunn
2011-12-06 21:52 ` Robert Jarzmik
2011-12-07 2:16 ` Mike Dunn
2011-12-07 8:01 ` Ricard Wanderlof
2011-12-07 18:32 ` Mike Dunn
2011-12-12 12:48 ` Artem Bityutskiy
2011-12-14 20:46 ` Mike Dunn
2011-12-16 10:09 ` Artem Bityutskiy
2011-12-07 9:42 ` Peter Horton
2011-12-07 18:33 ` Mike Dunn
2011-12-04 14:33 ` Artem Bityutskiy
2011-12-05 6:23 ` Artem Bityutskiy
2011-12-05 18:13 ` Mike Dunn
2011-12-05 21:16 ` Artem Bityutskiy
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