From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 173-11-172-146-houston.txt.hfc.comcastbusiness.net ([173.11.172.146] helo=mail.breakawaysystems.com) by canuck.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1PiU8f-0003Q2-Po for linux-mtd@lists.infradead.org; Thu, 27 Jan 2011 15:52:03 +0000 Received: from [192.168.1.100] (173-11.172.145-houston.txt.hfc.comcastbusiness.net [173.11.172.145]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: dlambert) by mail.breakawaysystems.com (Postfix) with ESMTPSA id B21CC148A25 for ; Thu, 27 Jan 2011 09:51:57 -0600 (CST) Message-ID: <4D41949D.2030505@lambsys.com> Date: Thu, 27 Jan 2011 09:51:57 -0600 From: David Lambert MIME-Version: 1.0 To: linux-mtd Subject: Verify-after-write on sub-pages Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I am working on a project that requires high reliability of logged data which is written to a UBI file system on NAND. I have observed one hardware failure mode at elevated temperatures where some chips report that a write was successful even though a subsequent read indicates that this was not true. To mitigate this I enabled CONFIG_MTD_NAND_VERIFY_WRITE. Unfortunately I found this does not work on sub-pages which are used by UBI. As a workaround I have forced UBI not to use sub-pages, but I was curious if either there were plans to add this feature, or if anyone was working on implementing it? Regards, Dave.