linux-kernel - Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

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Message-Id: <1174902357.20505.292.camel@pmac.infradead.org>
Date:	Mon, 26 Mar 2007 10:45:57 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Jörn Engel <joern@...ybastard.org>
Cc:	David Lang <david.lang@...italinsight.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matt Mackall <mpm@...enic.com>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Artem Bityutskiy <dedekind@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frank Haverkamp <haver@...t.ibm.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

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. 

-- 
dwmw2

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