From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from hotwww5.hotwww.com ([161.58.242.233]) by canuck.infradead.org with esmtps (Exim 4.43 #1 (Red Hat Linux)) id 1D5wtq-0001EL-O5 for linux-mtd@lists.infradead.org; Mon, 28 Feb 2005 21:14:15 -0500 From: Peter Grayson To: linux-mtd@lists.infradead.org Content-Type: text/plain Date: Mon, 28 Feb 2005 19:14:07 -0700 Message-Id: <1109643247.5043.26.camel@pgrayson1.realmsys.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Can you really write a jffs2 image with nandwrite? Reply-To: pgrayson@realmsys.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I am using a PowerPC 405 based Linux system running 2.6.10 kernel with CVS head of mtd patched in. The board has a 256MB Samsung NAND flash part with 2048 byte page size, 64 spare bytes per page, and 64 pages per eraseblock (128kB eraseblock). I want to use jffs2 partitions on this flash part. I can mount an empty partition with jffs2 and that works well, but I have been unable to weild mkfs.jffs2 and nandwrite to successfully write jffs2 images to flash. >>From reading the mkfs.jffs2 code, it seems that mkfs.jffs2 has no concept of out-of-bounds data. Consequently, it appears that the nandwrite expects to find out-of-bounds data immediately after the in- bounds data for every page. I have looked at the bits of the jffs2 image produced by mkfs.jffs2 and I can see that it does not really produce out of bounds data. Below is the mkfs.jffs2 command line I am using. I have tried many other combinations of options, but they do not yield appreciably different results. mkfs.jffs2 --pagesize=2048 \ --eraseblock=128 \ --pad \ --output=image.jffs2 \ --compression-mode none \ --no-cleanmarkers \ --big-endian \ --squash \ --verbose \ --root=$ROOT_DIR When I try using this image with "nandwrite -j", the image appears to be written successfully, but when I try to mount the new filesystem, mount fails with the following error message: mount: Mounting /dev/mtdblock0 on /mnt failed: Invalid argument If I try to use "nandwrite -j -o", nandwrite complains about the image not being aligned: Input file is not page aligned: Success Data did not fit into device, due to bad blocks : Success In this case, nandwrite bails out early and does not write anything to flash. Is there something obvious I am missing? I have read the FAQ at: http://www.linux-mtd.infradead.org/tech/faq.html so I know that the working theory is that this should work, but it is not working for me. Has anyone else had a similar experience? Thanks in advance for any help you can offer. - Pete