From: LiuShuo <b35362@freescale.com>
To: Scott Wood <scottwood@freescale.com>, <dedekind1@gmail.com>
Cc: Artem.Bityutskiy@nokia.com, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, shuo.liu@freescale.com,
linux-mtd@lists.infradead.org, akpm@linux-foundation.org,
dwmw2@infradead.org
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip
Date: Fri, 16 Dec 2011 10:44:06 +0800 [thread overview]
Message-ID: <4EEAB076.30000@freescale.com> (raw)
In-Reply-To: <4EE903CE.1010903@freescale.com>
=E4=BA=8E 2011=E5=B9=B412=E6=9C=8815=E6=97=A5 04:15, Scott Wood =E5=86=99=
=E9=81=93:
> On 12/14/2011 02:41 AM, LiuShuo wrote:
>> =E4=BA=8E 2011=E5=B9=B412=E6=9C=8813=E6=97=A5 10:46, LiuShuo =E5=86=99=
=E9=81=93:
>>> =E4=BA=8E 2011=E5=B9=B412=E6=9C=8813=E6=97=A5 05:30, Scott Wood =E5=86=
=99=E9=81=93:
>>>> On 12/12/2011 03:19 PM, Artem Bityutskiy wrote:
>>>>> On Mon, 2011-12-12 at 15:15 -0600, Scott Wood wrote:
>>>>>> NAND chips come from the factory with bad blocks marked at a certa=
in
>>>>>> offset into each page. This offset is normally in the OOB area, b=
ut
>>>>>> since we change the layout from "4k data, 128 byte oob" to "2k
>>>>>> data, 64
>>>>>> byte oob, 2k data, 64 byte oob" the marker is no longer in the
>>>>>> oob. On
>>>>>> first use we need to migrate the markers so that they are still in
>>>>>> the oob.
>>>>> Ah, I see, thanks. Are you planning to implement in-kernel migratio=
n or
>>>>> use a user-space tool?
>>>> That's the kind of answer I was hoping to get from Shuo. :-)
>>> OK, I try to do this. Wait for a couple of days.
>>>
>>> -LiuShuo
>> I found it's too complex to do the migration in Linux driver.
>>
>> Maybe we can add a uboot command (e.g. nand bbmigrate) to do it, once =
is
>> enough.
> Any reason not to do it automatically on the first U-Boot bad block
> scan, if the flash isn't marked as already migrated?
>
> Further discussion on the details of how to do it in U-Boot should move
> to the U-Boot list.
>
>> And let user ensure it been completed before linux use the Nand flash =
chip.
> I don't want to trust the user here. It's too easy to skip it, and
> things will appear to work, but have subtle problems.
>
>> Even if we don't do the migration, the bad block also can be marked as=
bad
>> by wearing. So, do we really need to take much time to implement it ?
>> (code looks too complex.)
> It is not acceptable to ignore factory bad block markers just because
> some methods of using the flash may eventually detect an error (possibl=
y
> after data is lost -- no guarantee that the badness is ECC-correctable)
> and mark the block bad again.
>
> If you don't feel up to the task, I can look at it, but won't have time
> until January.
hi Scott,
It's really hard to me and I have much other works to do now. Thanks for=20
your help.
hi Artem,
Could this patch be applied now and we make a independent patch for bad=20
block information
migration later?
-LiuShuo
> -Scott
next prev parent reply other threads:[~2011-12-16 2:39 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-04 4:31 [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR shuo.liu
2011-12-04 4:31 ` [PATCH 2/3] mtd/nand : set correct length to FBCR for a non-full-page write shuo.liu
2011-12-04 4:31 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip shuo.liu
2011-12-05 6:47 ` Artem Bityutskiy
2011-12-05 19:46 ` Scott Wood
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-06 11:49 ` Artem Bityutskiy
2011-12-07 0:09 ` Scott Wood
2011-12-07 3:55 ` LiuShuo
2011-12-07 19:11 ` Scott Wood
2011-12-08 10:44 ` LiuShuo
2011-12-08 18:43 ` Scott Wood
2011-12-12 21:09 ` Artem Bityutskiy
2011-12-12 21:15 ` Scott Wood
2011-12-12 21:19 ` Artem Bityutskiy
2011-12-12 21:30 ` Scott Wood
2011-12-13 2:46 ` LiuShuo
2011-12-14 8:41 ` LiuShuo
2011-12-14 20:15 ` Scott Wood
2011-12-15 4:59 ` Li Yang
2011-12-15 17:32 ` Scott Wood
2011-12-16 2:44 ` LiuShuo [this message]
2011-12-16 17:59 ` Scott Wood
2011-12-19 11:05 ` Li Yang
2011-12-19 16:47 ` Scott Wood
2011-12-20 9:08 ` Li Yang
2011-12-20 19:48 ` Scott Wood
2011-12-17 14:35 ` Artem Bityutskiy
2011-12-19 18:38 ` Scott Wood
2011-12-19 18:42 ` Scott Wood
2011-12-14 3:41 ` LiuShuo
2011-12-14 20:53 ` Scott Wood
2011-12-05 6:50 ` [PATCH 1/3] mtd/nand : use elbc_fcm_ctrl->oob to set FPAR_MS bit of FPAR Artem Bityutskiy
-- strict thread matches above, loose matches on Subject: below --
2011-11-24 0:41 b35362
2011-11-24 0:41 ` [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip b35362
2011-11-24 7:37 ` Li Yang-R58472
2011-11-28 17:20 ` Scott Wood
2011-11-24 7:41 ` Artem Bityutskiy
2011-11-24 7:49 ` Li Yang-R58472
2011-11-24 8:16 ` Artem Bityutskiy
2011-11-24 10:02 ` LiuShuo
2011-11-24 11:07 ` Artem Bityutskiy
2011-11-28 21:48 ` Scott Wood
2011-11-28 21:49 ` Scott Wood
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