From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.kernelconcepts.de ([212.60.202.196]) by bombadil.infradead.org with esmtps (Exim 4.69 #1 (Red Hat Linux)) id 1LS9ZG-0005jl-6Y for linux-mtd@lists.infradead.org; Wed, 28 Jan 2009 12:30:56 +0000 Message-ID: <49804FFB.90004@kernelconcepts.de> Date: Wed, 28 Jan 2009 13:30:51 +0100 From: Nils Faerber MIME-Version: 1.0 To: forriyaz@yahoo.com Subject: Re: mtd nand issue References: <15731.47945.qm@web63005.mail.re1.yahoo.com> In-Reply-To: <15731.47945.qm@web63005.mail.re1.yahoo.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-mtd@lists.infradead.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , syed riyaz schrieb: > Hi Hi! > I use a 2K page size 1 GB nand chip on a mx31 ads basd board. At redboot level, read and write happpen perfectly. Even in kernel, flash_eraseall is fine. Then i did nanddump -p and saw 0xff on all addresses. So i believe the nand driver is fine.I am trying to use a nand partition as my rootfilesystem. I have partioned nand into 4 mtd blocks. 60 MB for the first 3 and and the remaining 820 in the 4th block. I created a 8 MB jffs2 file system named rootfs.jffs2 with the proper erase size. Wrote to mtd block 6 usingnandwrite /dev/mtd/6 rootfs.jffs2When linux mounted this block, i went in fine for the first time. But subsequent booting returned lot of CRC errors until the file system was hopelessly currupted. Any help appreciated.The messages are likemtd->read:0x100 bytes from block 0 CRC error.I read somewhere that the factory information about bad blocks is stores in first block and if erased will lead to errors. Pleas elaborate if you know.Please > answer my queries so i understand things a litle better.1) Is it ok to flash a 8 MB image on a 60 MB partion. Are the errors because the remaining partition doesnt match?2) If i specify "root=/dev/mtdblock6" while booting, does the kernel see only mtd7 as available space or will mtd5 and mtd7 and mtd8 will also be available as user space.3)What does nandwrite -a -p mean? Did you give proper option to mkfs.jffs2 for eraseblockzize and such? If not, do it - it should improve the situation ;) > Thanking you Cheers nils faerber -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 Fax: +49-271-771091-19 D-57072 Siegen Mob: +49-176-21024535 http://www.kernelconcepts.de