From: Thomas Gleixner <tglx@linutronix.de>
To: David Woodhouse <dwmw2@infradead.org>
Cc: "Jörn Engel" <joern@lazybastard.org>,
"David Lang" <david.lang@digitalinsight.com>,
"Matt Mackall" <mpm@selenic.com>,
"Josh Boyer" <jwboyer@linux.vnet.ibm.com>,
"Artem Bityutskiy" <dedekind@infradead.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Frank Haverkamp" <haver@vnet.ibm.com>,
"Christoph Hellwig" <hch@infradead.org>
Subject: Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images
Date: Mon, 26 Mar 2007 12:02:40 +0200 [thread overview]
Message-ID: <1174903360.4182.25.camel@chaos> (raw)
In-Reply-To: <1174902357.20505.292.camel@pmac.infradead.org>
On Mon, 2007-03-26 at 10:45 +0100, David Woodhouse wrote:
> On Mon, 2007-03-26 at 03:04 +0200, Jörn Engel wrote:
> > That limitation stems from ECC and ECC is done in software. Currently
> > everyone and his dog is doing ECC in chunks of 256 bytes on NAND. So
> > your minimum write size is 256 bytes _if you care about ECC_. If you
> > don't care, you can write single bits on NAND, just as you can on NOR.
>
> No, on NAND flash it's a limitation of the hardware. The number of write
> cycles you can perform to a given page is limited. Exceed it and the
> contents of that page become undefined due to leakage, until you next
> erase it.
Right and you cannot write to random locations in a page. The write
chunks have to be in consecutive order. If you write 0xAA to offset 0,
you cannot rewrite it to 0x00 later without risking corruption.
tglx
next prev parent reply other threads:[~2007-03-26 10:02 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-14 15:19 [PATCH 00/22 take 3] UBI: Unsorted Block Images Artem Bityutskiy
2007-03-14 15:19 ` [PATCH 01/22 take 3] UBI: on-flash data structures header Artem Bityutskiy
2007-03-14 15:19 ` [PATCH 02/22 take 3] UBI: user-space API header Artem Bityutskiy
2007-03-14 15:19 ` [PATCH 03/22 take 3] UBI: kernel-space " Artem Bityutskiy
2007-03-14 15:19 ` [PATCH 04/22 take 3] UBI: internal header Artem Bityutskiy
2007-03-14 15:19 ` [PATCH 05/22 take 3] UBI: startup code Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 06/22 take 3] UBI: scanning unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 07/22 take 3] UBI: I/O unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 08/22 take 3] UBI: volume table unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 09/22 take 3] UBI: wear-leveling unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 10/22 take 3] UBI: EBA unit Artem Bityutskiy
2007-03-15 19:07 ` Andrew Morton
2007-03-15 21:24 ` Randy Dunlap
2007-03-15 23:29 ` Josh Boyer
2007-03-16 1:49 ` Randy Dunlap
2007-03-16 10:23 ` Artem Bityutskiy
2007-03-16 10:21 ` Artem Bityutskiy
2007-03-16 14:55 ` Randy Dunlap
2007-03-16 10:14 ` Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 11/22 take 3] UBI: user-interfaces unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 12/22 take 3] UBI: update functionality Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 13/22 take 3] UBI: accounting unit Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 14/22 take 3] UBI: volume management functionality Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 15/22 take 3] UBI: sysfs functionality Artem Bityutskiy
2007-03-14 15:20 ` [PATCH 16/22 take 3] UBI: character devices functionality Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 17/22 take 3] UBI: gluebi functionality Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 18/22 take 3] UBI: misc stuff Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 19/22 take 3] UBI: debugging stuff Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 20/22 take 3] UBI: JFFS2 UBI support Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 21/22 take 3] UBI: update MAINTAINERS Artem Bityutskiy
2007-03-14 15:21 ` [PATCH 22/22 take 3] UBI: Linux build integration Artem Bityutskiy
2007-03-18 16:27 ` [PATCH 00/22 take 3] UBI: Unsorted Block Images Matt Mackall
2007-03-18 16:49 ` Artem Bityutskiy
2007-03-18 19:18 ` Matt Mackall
2007-03-18 20:31 ` Josh Boyer
2007-03-19 17:08 ` Matt Mackall
2007-03-19 18:16 ` Josh Boyer
2007-03-19 19:54 ` Matt Mackall
2007-03-19 20:18 ` Artem Bityutskiy
2007-03-19 21:05 ` Thomas Gleixner
2007-03-19 22:32 ` Matt Mackall
2007-03-20 0:42 ` Thomas Gleixner
2007-03-20 1:05 ` Matt Mackall
2007-03-20 6:28 ` Thomas Gleixner
2007-03-21 11:05 ` Jörn Engel
2007-03-21 11:25 ` Thomas Gleixner
2007-03-21 11:35 ` Jörn Engel
2007-03-21 11:57 ` Thomas Gleixner
2007-03-21 12:31 ` Jörn Engel
2007-03-21 12:39 ` Artem Bityutskiy
2007-03-21 11:36 ` Artem Bityutskiy
2007-03-25 20:08 ` Jörn Engel
2007-03-25 21:49 ` David Lang
2007-03-25 22:55 ` Jörn Engel
2007-03-25 23:46 ` David Woodhouse
2007-03-26 0:01 ` Jörn Engel
2007-03-26 0:21 ` David Woodhouse
2007-03-26 1:04 ` Jörn Engel
2007-03-26 9:45 ` David Woodhouse
2007-03-26 9:51 ` Jörn Engel
2007-03-26 10:07 ` David Woodhouse
2007-03-26 10:02 ` Thomas Gleixner [this message]
2007-03-26 10:49 ` Artem Bityutskiy
2007-03-26 11:30 ` Jörn Engel
2007-03-19 21:06 ` Artem Bityutskiy
2007-03-19 21:36 ` Matt Mackall
2007-03-20 0:43 ` Thomas Gleixner
2007-03-20 12:25 ` Artem Bityutskiy
2007-03-20 13:52 ` Theodore Tso
2007-03-20 15:14 ` Artem Bityutskiy
2007-03-20 15:59 ` Josh Boyer
2007-03-20 18:58 ` David Lang
2007-03-20 20:05 ` Artem Bityutskiy
2007-03-20 21:36 ` David Woodhouse
2007-03-21 8:54 ` Artem Bityutskiy
2007-03-20 21:32 ` David Woodhouse
2007-03-21 13:03 ` Jörn Engel
2007-03-20 22:03 ` Theodore Tso
2007-03-21 8:44 ` Artem Bityutskiy
2007-03-21 13:50 ` Theodore Tso
2007-03-21 13:59 ` Josh Boyer
2007-03-21 14:02 ` Artem Bityutskiy
2007-03-21 15:38 ` Frank Haverkamp
2007-03-21 20:26 ` David Lang
2007-03-20 12:13 ` Josh Boyer
2007-03-19 19:03 ` Thomas Gleixner
2007-03-19 20:12 ` Matt Mackall
2007-03-19 21:04 ` Thomas Gleixner
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