From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from tilbrook.insync.tv ([188.122.33.11] helo=mail.insync.tv) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZPU62-00071w-Uf for barebox@lists.infradead.org; Wed, 12 Aug 2015 11:21:27 +0000 Received: from [192.168.1.11] by mail.insync.tv with esmtp (Exim 4.80) (envelope-from ) id 1ZPU5h-0003A3-A6 for barebox@lists.infradead.org; Wed, 12 Aug 2015 12:21:05 +0100 Message-ID: <55CB2C1C.4000002@insync.tv> Date: Wed, 12 Aug 2015 12:21:00 +0100 From: Dave Kitchen MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: MTD with non-power-of-2 page size To: barebox@lists.infradead.org I have just started to work with barebox on an Atmel at91sam9g45 processor. The board has an Atmel AT45DB161 dataflash configured as 528-byte page size. I find that eg saveenv command does not run as the page erase fails with EINVAL. On tracing this is fired from the page size and offset correction code [mtd/core,c mtd_erase_align()] which uses bit masking to align the size and offset. Unfortunately bit-masking does not work with non-power-of-2 pages. Has anyone else addressed this problem? The 'trivial' exercise of replacing the bit masks by modulo [%] operator does not succeed as the compiler I am using (gcc!) does not support long-long divmod. Regards Dave Kitchen InSync technology Ltd _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox