From mboxrd@z Thu Jan 1 00:00:00 1970 From: Orjan Friberg Subject: Spurious ECC errors with mtd_subpagetest (OMAP3, NAND) Date: Fri, 2 Mar 2012 17:17:47 +0100 Message-ID: <4F50F2AB.10209@flatfrog.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-mtd-bounces@lists.infradead.org Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org To: "linux-mtd@lists.infradead.org" , "linux-omap@vger.kernel.org" List-Id: linux-omap@vger.kernel.org Hi, When running the mtd_subpagetest I'm seeing more or less spurious ECC corrections. I.e., one round may show 4 corrections and the next will show 7, only some of which are the same as the previous 4. Are the ECC errors expected to be that volatile and frequent? I've seen various discussions regarding the OMAP sub page support, as well as problems with the GPMC prefetch engine. Disabling both made no difference regarding this. I've also tried two different sets of NAND timings (relaxed and optimized), with no difference. I'm using a Micron NAND that requires 4-bit ECC correction but I'm running with only 1-bit (software) ECC. This is on an old kernel, 2.6.32. Thanks, Orjan -- Orjan Friberg FlatFrog Laboratories AB ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/