From: Scott Wood <scottwood@freescale.com>
To: Li Yang <leoli@freescale.com>
Cc: Artem.Bityutskiy@nokia.com, dedekind1@gmail.com,
dwmw2@infradead.org, LiuShuo <b35362@freescale.com>,
linux-kernel@vger.kernel.org, shuo.liu@freescale.com,
linux-mtd@lists.infradead.org, akpm@linux-foundation.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip
Date: Thu, 15 Dec 2011 11:32:40 -0600 [thread overview]
Message-ID: <4EEA2F38.2090807@freescale.com> (raw)
In-Reply-To: <CADRPPNRRXTWzBEvY=vhe9+v0b8Ntq8KNoaXFN8pQZGmMc-dJYw@mail.gmail.com>
On 12/14/2011 10:59 PM, Li Yang wrote:
> The limitation of the proposed bad block marker migration is that you
> need to make sure the migration is done and only done once. If it is
> done more than once, the factory bad block marker is totally messed
> up. It requires a complex mechanism to automatically guarantee the
> migration is only done once, and it still won't be 100% safe.
>
> I would suggest we use a much easier compromise that we form the BBT
> base on the factory bad block marker on first use of the flash, and
> after that the factory bad block marker is dropped. We just relies on
> the BBT for information about bad blocks. Although by doing so we
> can't regenerate the BBT again, as there is mirror for the BBT I
> don't think we have too much risk.
I have corrupted the BBT too often during development (e.g. a bug makes
all accesses fail, so the upper layers decide to mark everything bad) to
be comfortable with this.
Elsewhere in the thread I suggested a way to let the marker be in either
the bbt or in a dedicated block, depending on whether it's a development
situation where the BBT needs to be erasable.
-Scott
next prev parent reply other threads:[~2011-12-15 17:38 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 [this message]
2011-12-16 2:44 ` LiuShuo
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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