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

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Message-Id: <1174868485.20505.284.camel@pmac.infradead.org>
Date:	Mon, 26 Mar 2007 01:21:25 +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 02:01 +0200, Jörn Engel wrote:
> You can on NAND.  ECC is done in software.  And for a data structure as
> simple as the 'tally', foregoing ECC is not a huge problem - most
> bitflips are easily detected and the remaining only cause off-by-a-few
> on the erase count. 

You're only allowed a limited number of write cycles to each page
though. So you can't just clear the bits in a 2112-byte page one at a
time; typically when you clear the fifth bit, the contents of the whole
page become undefined until the next erase cycle.

-- 
dwmw2

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