Steve,
Thanks for the reply. I have solved ECC issue same way. I was using linux kernel 2.6.18. Anyways the major problem starts now. I tried to mount mtd partitions mtd3 and mtd4 from the linux prompt. I verified the size of mounted partition. mtd3 partition shows ~500MB and for mtd4 its 1.5G. When I copied more than 500 MB data (~650MB) on mtd4 partition and next time when I booted the board it was not booting. I think the UBL/UBoot partitions were overwritten. Again I flashed the UBL/UBoot and the board is booting without any problem. Have you ever experienced this? Regards, Krunal ----- Original Message ----- From: "Steve Poulsen" <[email protected]> To: [email protected] Sent: Friday, June 11, 2010 8:53:35 PM Subject: Re: DM365 UBoot + NAND Query Krunal, What version kernel are you using? One thing to note is that the Chip ID of 0xd3 can actually correspond to several layouts of the NAND. The kernel seems to read the proper info and adjust accordingly but U-boot may not. If you are using 2.6.10, you will need to go through and increase several of the arrays because they do not handle the larger layout (4224 bytes) and will overflow and cause ECC errors or even lockups. If you are using 2.6.18, you will also want to either turn off the "use standard layout" option under the kernel config (Drivers-MTD-Nand, somewhere below that) OR you will want to make sure U-boot is using the larger layout. I have seen the exact error you seen and fixed it by changing the array sizes and disabling the Davinci use standard layout option. This puts newer kernels back to the 4-bit ECC as opposed to Software ECC. Some versions of the kernel may have broken HW-ECC though. Steve On 06/11/2010 04:46 AM, Krunal Patil wrote: Thanks for the pointers Jon. I will try your suggestions and get back with the results. -- Regads , Krunal ----- Original Message ----- From: "Jon Povey " <Jon. Povey @ racelogic .co. uk > To: " krunal patil " < krunal . patil @ einfochips .com> Cc: " Davinci List" < davinci - linux -open-source@ linux . davincidsp .com> Sent: Friday, June 11, 2010 3:13:54 PM Subject: RE: DM365 UBoot + NAND Query Krunal Patil wrote: > 1. How can I verify whether UBoot is detecting and accessing both the > NANDs not only one? u-boot can read, write and erase NAND ; you could erase and write a page on one chip and see if it shows up on the other. > 2. Can you please through some light on "I would be more concerned > about the ECC errors and that the kernel is reporting BBT not found." Well, this should not happen: > > > nand _ bbt : ECC error while reading bad block table And the kernel should find the BBTs , it should agree with U-boot. I suggest trying a more recent version of u-boot if that's an option. > 3. How can I verify "Large page OOB layout" in UBoot and Kernel? How > can I fix this mismatch? I find OpenOCD useful, it's JTAG software with davinci NAND drivers for both large page layouts, and config files for many davinci boards. If you do that, build the latest version from git, there have been some important patches to davinci NAND handling since the last released version 0.4.0. The source code for the OpenOCD davinci NAND driver should help you understand the layout differences. Also, I think there is some related stuff in the silicon errata for DM365. -- Jon Povey jon . povey @ racelogic .co. uk Racelogic is a limited company registered in England. Registered number 2743719 . Registered Office Unit 10, Swan Business Centre , Osier Way, Buckingham, Bucks, MK18 1TB . The information contained in this electronic mail transmission is intended by Racelogic Ltd for the use of the named individual or entity to which it is directed and may contain information that is confidential or privileged. 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