From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.myoutlookonline.com ([69.25.74.59]) by pentafluge.infradead.org with esmtp (Exim 4.62 #1 (Red Hat Linux)) id 1GRmWQ-0000k0-M2 for linux-mtd@lists.infradead.org; Mon, 25 Sep 2006 10:13:07 +0100 From: "Ajay Jain" To: Subject: Questions regarding JFFS2/NAND Date: Mon, 25 Sep 2006 14:41:30 +0530 Message-ID: <071301c6e082$985f23a0$561fa8c0@pcajain> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Reply-To: ajain@neomagic.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi All, I have a few questions. Please help me to answer them, if you find suitable. 1. Is it possible to run JFFS2 on NAND Flash on 2.4. I am seeing that the mtd website mentions that it is not supported. I do not clearly understand what it means. Does it mean that mtd guys do not support it, or does it mean that you can't run JFFS2 on nand in 2.4 at all. 2. On version 2.4.21, we see that 'ecc' is always disabled. It does not really matter, as what value we set. Is anybody you aware of this issue. 3. Because of this, we backported 'mtd' from 2.6 version. Now the mtd appears to be reasonably stable. But we still have the old jffs2 in place. The new mtd does not allow unaligned writes, but jffs2 (the old one) keeps sending unaligned requests. We modified the mtd layer to handle this, but then the issue is that we are writing to the same page again and again, as the writes are unaligned. But the ecc value can only be written once. So this solution will not work either. It does work if we switch off the ecc. Are you aware of any of these issues, is my observation correct. 4. Is it realistically possible to backport 2.6 JFFS2 to 2.4. Please help me to solve these issues. We want to run JFFS2 on 2.4/NAND. Thanks.