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From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: linux-mtd-bounces@lists.infradead.org, stefan.bigler@keymile.com,
	"Michael Cashwell" <mboards@prograde.net>,
	linux-mtd@lists.infradead.org,
	"Anders Grafström" <grfstrm@users.sourceforge.net>,
	"Holger brunck" <holger.brunck@keymile.com>
Subject: Re: Numonyx NOR and chip->mutex bug?
Date: Thu, 10 Feb 2011 16:04:59 +0100	[thread overview]
Message-ID: <OF1160F22A.C6961712-ONC1257833.00526535-C1257833.0052DAD1@transmode.se> (raw)
In-Reply-To: <OF4E49CFD6.F0E578FE-ONC1257833.004BF8B1-C1257833.004D48AA@transmode.se>

>
> Anders Grafström <grfstrm@users.sourceforge.net> wrote on 2011/02/10 14:21:36:
> >
> > On 2011-02-09 22:59, Michael Cashwell wrote:
> > > On Feb 9, 2011, at 3:13 PM, Joakim Tjernlund wrote:
> > >
> > >> hmm, this sounds similar(from http://www.numonyx.com/Documents/Specification%20Updates/SU-309045_P30.pdf)
> > >>
> > >> 5. W602: erase suspend resume operation
> > >> Problem: P30 product may fail to erase in intensive erase/suspend/resume environments. This is
> > >>        due to an internal firmware issue that is exhibited in certain applications that require at
> > >>       least 3000 to 4000 erase/suspend/resume cycles during the erase of a single block.
> > >> Implication: Customer may see erase failure (SR reports “A0”) during a background erase. This
> > >>                does not damage the device in any way, but data in the block may be disturbed from its
> > >>               original state.
> >
> > I've seen this issue with Intel 28F640J5 chips as well.
> >
> > There's an old thread on it.
> > http://lists.infradead.org/pipermail/linux-mtd/2008-April/021266.html
> >
> > A delay was suggested similar to the one you're experimenting with I think.
> > http://lists.infradead.org/pipermail/linux-mtd/2008-April/021436.html
>
> Oh, I had forgotten about this thread :)
>
> I agree with the latency theory, for Numonyx there is this:
>
> W602 is the typical time between an initial block erase or erase resume command and the a subsequent erase suspend
> command. Violating the specification repeatedly during any particular block erase may cause erase failures.
>
> W602 is defined to 500us
>
> Adding a delay after resume will do it but is a bit crude. Possibly one
> could add a timestamp at resume/initial erase and a check in suspend that enough time has passed
> before suspending again.
>
> How does that sound?

A simpler impl. would be a suspend counter. When no. of suspends > 1000, do usleep(500)
or usleep(500) every 100-500 suspends.

 Jocke

  reply	other threads:[~2011-02-10 15:04 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-25 18:14 Numonyx NOR and chip->mutex bug? Michael Cashwell
2011-01-25 18:56 ` Joakim Tjernlund
2011-01-25 22:03   ` Michael Cashwell
2011-01-25 23:09     ` Joakim Tjernlund
2011-02-02 16:20       ` Michael Cashwell
2011-02-02 17:37         ` Stefan Bigler
2011-02-02 20:12         ` Joakim Tjernlund
2011-02-02 21:19           ` Michael Cashwell
2011-02-03  8:11             ` Joakim Tjernlund
2011-02-03  9:50               ` Joakim Tjernlund
2011-02-03 15:24                 ` Michael Cashwell
2011-02-03 16:38                   ` Stefan Bigler
2011-02-03 23:18                     ` Stefan Bigler
2011-02-04 10:47                       ` Joakim Tjernlund
2011-02-04 11:04                         ` Stefan Bigler
2011-02-04 12:26                           ` Joakim Tjernlund
2011-02-04 12:35                             ` Joakim Tjernlund
2011-02-04 12:42                               ` Joakim Tjernlund
2011-02-04 13:05                           ` Joakim Tjernlund
2011-02-04 13:25                             ` Joakim Tjernlund
2011-02-04 16:45                             ` Stefan Bigler
2011-02-04 16:55                               ` Joakim Tjernlund
2011-02-04 17:09                             ` Michael Cashwell
     [not found]                               ` <OF42EF <F66AF016-8A2B-4116-BE49-CE05B91BE50F@prograde.net>
     [not found]                               ` <OF42EF<F66AF016-8A2B-4116-BE49-CE05B91BE50F@prograde.net>
2011-02-05 10:29                               ` Joakim Tjernlund
2011-02-05 19:19                                 ` Michael Cashwell
2011-02-05 21:47                                   ` Michael Cashwell
2011-02-06  9:46                                     ` Joakim Tjernlund
2011-02-06 15:49                                       ` Michael Cashwell
2011-02-06 17:29                                         ` Joakim Tjernlund
2011-02-06 21:13                                           ` Michael Cashwell
     [not found]                                             ` <OF2C1ABD39 <4D5005E4.1040506@keymile.com>
     [not found]                                               ` <OFFF2C6D34.91E5D6C3-ONC1257 <96BD3889-E8AD-408D-8275-ED1A5FD55F1B@prograde.net>
     [not found]                                             ` <OF2C1ABD39<4D5005E4.1040506@keymile.com>
     [not found]                                               ` <OFFF2C6D34.91E5D6C3-ONC1257<96BD3889-E8AD-408D-8275-ED1A5FD55F1B@prograde.net>
     [not found]                                                 ` <OF9738D658.F46<4C117A67-5057-4ACD-8EBE-04E9C782570C@prograde.net>
     [not found]                                                   ` <OF6D40AC82.1008D3DD-ONC1 <4D53E660.4020305@users.sourceforge.net>
2011-02-06 21:20                                             ` Joakim Tjernlund
2011-02-07 14:47                                               ` Stefan Bigler
2011-02-07 15:01                                                 ` Joakim Tjernlund
2011-02-07 15:46                                                   ` Michael Cashwell
2011-02-07 15:52                                                     ` Stefan Bigler
2011-02-07 16:22                                                     ` Joakim Tjernlund
2011-02-07 16:46                                                       ` Michael Cashwell
2011-02-07 17:08                                                         ` Stefan Bigler
2011-02-07 19:04                                                           ` Michael Cashwell
2011-02-09 19:52                                                             ` Michael Cashwell
2011-02-09 20:13                                                               ` Joakim Tjernlund
2011-02-09 21:59                                                                 ` Michael Cashwell
2011-02-10 13:21                                                                   ` Anders Grafström
2011-02-10 14:04                                                                     ` Joakim Tjernlund
2011-02-10 15:04                                                                       ` Joakim Tjernlund [this message]
2011-02-10 15:59                                                                         ` Michael Cashwell
2011-02-10 16:05                                                                           ` Joakim Tjernlund
2011-02-10 16:41                                                                             ` Michael Cashwell
2011-02-10 16:46                                                                               ` Joakim Tjernlund
2011-02-10 17:02                                                                                 ` Joakim Tjernlund
2011-02-10 17:10                                                                                   ` Michael Cashwell
2011-02-10 17:20                                                                                     ` Joakim Tjernlund
2011-02-10 17:47                                                                                       ` Joakim Tjernlund
2011-02-10 18:26                                                                                         ` Joakim Tjernlund
2011-02-11 18:03                                                                                           ` Michael Cashwell
2011-02-12 10:47                                                                                             ` Joakim Tjernlund
2011-02-14 15:59                                                                                         ` Michael Cashwell
2011-02-14 15:44                                                                                       ` Michael Cashwell
2011-02-10 16:43                                                                           ` Michael Cashwell
2011-02-10 17:54                                                                             ` Anders Grafström
2011-02-11 15:05                                                                               ` Michael Cashwell
2011-02-11 15:39                                                                                 ` Joakim Tjernlund
2011-02-14 16:15                                                                                   ` Michael Cashwell
2011-02-11 17:00                                                                               ` Joakim Tjernlund
2011-02-10 15:43                                                                       ` Michael Cashwell
2011-02-10 15:51                                                                         ` Joakim Tjernlund
2011-02-24 10:50                                                                     ` Joakim Tjernlund
2011-02-24 11:36                                                                       ` Joakim Tjernlund
2011-02-24 14:28                                                                       ` Michael Cashwell
2011-02-10 14:53                                                                   ` Joakim Tjernlund
2011-02-06  9:40                                   ` Joakim Tjernlund
2011-02-06 14:55                                     ` Michael Cashwell
2011-02-07 15:10                                   ` Michael Cashwell
2011-02-07 15:48                                     ` Joakim Tjernlund
2011-02-03 13:24               ` Michael Cashwell
2011-02-03 14:01                 ` Joakim Tjernlund

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