From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-fx0-f49.google.com ([209.85.161.49]) by canuck.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1PjDUN-00044e-Q3 for linux-mtd@lists.infradead.org; Sat, 29 Jan 2011 16:17:28 +0000 Received: by fxm19 with SMTP id 19so4962116fxm.36 for ; Sat, 29 Jan 2011 08:17:25 -0800 (PST) Subject: Re: Verify-after-write on sub-pages From: Artem Bityutskiy To: David Lambert In-Reply-To: <4D41949D.2030505@lambsys.com> References: <4D41949D.2030505@lambsys.com> Content-Type: text/plain; charset="UTF-8" Date: Sat, 29 Jan 2011 18:16:44 +0200 Message-ID: <1296317804.2400.1.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Cc: linux-mtd Reply-To: dedekind1@gmail.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2011-01-27 at 09:51 -0600, David Lambert wrote: > 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? Yes, CONFIG_MTD_NAND_VERIFY_WRITE is broken sub-pages for very long time. I doubt anyone is fixing this, you have a chance to do this :-) -- Best Regards, Artem Bityutskiy (Артём Битюцкий)