Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752763AbdLQQYM (ORCPT ); Sun, 17 Dec 2017 11:24:12 -0500 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:37548 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751350AbdLQQYL (ORCPT ); Sun, 17 Dec 2017 11:24:11 -0500 Date: Sun, 17 Dec 2017 17:23:42 +0100 From: Willy Tarreau To: Ezequiel Garcia Cc: Boris Brezillon , Robert Jarzmik , "linux-mtd@lists.infradead.org" , linux-arm-kernel , "linux-kernel@vger.kernel.org" Subject: Re: pxa3xx_nand times out in 4.14 with JFFS2 Message-ID: <20171217162342.GA1833@1wt.eu> References: <20171217120503.GA3323@1wt.eu> <20171217155305.16c5bb4f@bbrezillon> <20171217150043.GA1403@1wt.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1174 Lines: 28 On Sun, Dec 17, 2017 at 12:53:36PM -0300, Ezequiel Garcia wrote: > If not too much to ask, this is the test that I believe is needed. > You seem to have a setup ready, hence why I'm asking you, if > possible, to give it a shot. > > (1) Scrub the BBT from the NAND. Or scrub the whole NAND. > You cannot do this from the kernel, it needs to be done from the bootloader. > > (2) Mark a couple blocks as bad using the OOB -- AFAICR, there > was a command to do this in the bootloader. > > (3) Boot, let Linux create the BBT and see if it catches the bad blocks. Are the current boot loaders safe regarding the scrub operation ? I'm asking because that's how I bricked my mirabox a few years ago when trying to mark a bad block from u-boot :-/ If someone has a good knowledge of these commands to limit the risk and helps me only playing with a small part at the end of the flash (or in the unused area) I'd prefer it :-) > This would guarantee that devices with factory bad blocks, > (and no BBT), would be OK with this patch. I see. I'm fine with trying provided I have reasonably good assurance that I won't have to go through the kwboot pain again :-/ Cheers, Willy