Krunal,
I have not experienced this so I cannot offer any advice other than
debugging methods, which you already know. Maybe you can cat /proc/mtd
to make sure it agrees with what you expect.
Steve
On 06/11/2010 12:41 PM, Krunal Patil wrote:
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" <[email protected]>
To: "krunal patil" <[email protected]>
Cc: "Davinci List" <[email protected]>
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
[email protected]
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