From: Ivan Djelic <ivan.djelic@parrot.com>
To: Atlant Schmidt <aschmidt@dekaresearch.com>
Cc: Ricard Wanderlof <ricard.wanderlof@axis.com>,
Brian Norris <computersforpeace@gmail.com>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
Matthieu Castet <matthieu.castet@parrot.com>,
Artem Bityutskiy <dedekind1@gmail.com>
Subject: Re: dangerous NAND_BBT_SCANBYTE1AND6
Date: Wed, 25 May 2011 20:31:54 +0200 [thread overview]
Message-ID: <20110525183154.GA20866@parrot.com> (raw)
In-Reply-To: <0A40042D85E7C84DB443060EC44B3FD32A69415800@dekaexchange07.deka.local>
On Wed, May 25, 2011 at 07:04:40PM +0100, Atlant Schmidt wrote:
> Ivan:
>
> > <digression> ...
> > And recent Micron devices do not store markers in flash; they just
> > return 0x00 for any byte read in a bad block (instead of the real
> > data), using an internal bad block table.
> > </digression>
>
> Does this mean that it is impossible to mark additional
> bad blocks in these devices as blocks go hard-bad during
> use? Or do commands exist to extend the internal bad
> block table? (And do our MTD drivers know how to do that?)
>
Note that the usual bad block detection still works on those Micron devices.
They just do not store markers in flash.
You can still mark a block gone bad either by writing your own marker into the
block or (better) in a separate BBT. The internal Micron table is hard-wired
and only used to shortcut access to factory bad blocks AFAIK.
Regards,
Ivan
next prev parent reply other threads:[~2011-05-25 18:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-21 15:52 dangerous NAND_BBT_SCANBYTE1AND6 Matthieu CASTET
2011-04-21 17:10 ` Ivan Djelic
2011-04-22 4:50 ` Brian Norris
2011-04-22 8:23 ` Artem Bityutskiy
2011-04-22 8:53 ` Matthieu CASTET
2011-04-22 9:28 ` Artem Bityutskiy
2011-04-21 17:33 ` Brian Norris
2011-04-22 9:02 ` Matthieu CASTET
2011-04-26 7:30 ` Ricard Wanderlof
2011-05-24 1:09 ` Brian Norris
2011-05-25 16:41 ` Ivan Djelic
2011-05-25 18:04 ` Atlant Schmidt
2011-05-25 18:31 ` Ivan Djelic [this message]
2011-05-26 7:09 ` Ricard Wanderlof
2011-05-26 7:58 ` Ivan Djelic
2011-05-26 7:07 ` Ricard Wanderlof
2011-05-26 7:57 ` Ivan Djelic
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