From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from anchor-post-31.mail.demon.net ([194.217.242.89]) by canuck.infradead.org with esmtp (Exim 4.42 #1 (Red Hat Linux)) id 1CJvLP-0004QN-2a for linux-mtd@lists.infradead.org; Tue, 19 Oct 2004 10:52:13 -0400 Content-Type: text/plain; charset="iso-8859-1" From: Simon Haynes To: tglx@linutronix.de Date: Tue, 19 Oct 2004 15:39:36 +0100 References: <1098186608.12223.857.camel@thomas> In-Reply-To: <1098186608.12223.857.camel@thomas> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-ID: Cc: linux-mtd@lists.infradead.org Subject: Re: Bad Blocks On JFFS2/NAND Reply-To: simon@baydel.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Thomas, I am using the ready pin. On Tuesday 19 Oct 2004 12:50 pm, Thomas Gleixner wrote: > On Tue, 2004-10-19 at 13:22, Simon Haynes wrote: > > I have experienced a problem in which a JFF2 filesystem on NAND became > > full. This is a root file system and constant writes to a logfile filled > > the filesystem. On investigation it was found that the NAND device now > > had hundreds of bad blocks. > > > > I started to investigate this and found that JFFS2 was announcing > > > > Newly-erased block contained word 0x1985e002 at offset 0x020f7e00 > > > > Messages which result in my mtd/jffs2 code marking the block bad. What I > > find strange is that a subsequent scan list the new block at a different > > 16k offset when the device erasesize is 16k, in this case 0x020f0000. Is > > that because my device is 128Mb and JFFS2 is using this 'virtual erase > > size' of 32k ? > > Yes. The bad block code scans/marks physical blocks and JFFS2 operates > on virtual ones, if the device size is big enough. > > > I have observed this now on several different NAND devices and it seems > > to be more prominent while performing small writes. > > > > I am currently trying to work out if the erase is not completing, or this > > is the wrong block or something else. > > Hmm, are you using Ready/Busy Pin or the timeout ? > > tglx > > > > ______________________________________________________ > Linux MTD discussion mailing list > http://lists.infradead.org/mailman/listinfo/linux-mtd/