On 4/27/10 11:52 PM, "Jon Povey" <[email protected]> wrote:
> Gary Carlson wrote:
>> I wanted to see if anyone has any experience trying to upload the
>> AT91Bootstrap code into NAND flash for any of the AT91SAM9XXX parts
>> (i.e. AT91SAM9260, AT91SAM9G20, etc.) using OpenOCD?
> ...
>> At this point, I
>> would be happy if someone has marched down this path before and can
>> chime in with some advice. I have spent several days trying to attack
>> this problem without much success. At least on the surface it does
>> not seem like this should be that difficult.
>
> Not on this platform, but I have done things with NAND on another platform.
>
> Maybe suggesting the obvious, but do you have any other way to program the
> NAND flash on this board, or a reference board (EVM?) with a known good flash
> image?
Yes, unfortunately the Atmel Windows-based ISP works fine, but they don't
provide source code for that! :)
> If you do, get that booting then read the flash back with OpenOCD and compare
> with what you managed to do, get so you can recreate it.
>
> Also double-check boot config pin settings and all that other good hardware
> stuff.
>
I am reasonably sure that is correct. As I stated earlier I can erase,
write, and verify the image with OpenOCD, but unfortunately the first stage
boostrapper "RomBOOT" doesn't like it. I am starting to wonder if it is
balking because of what is stored in the OOB areas, but I can't get OpenOCD
to read back images burned by their ISP (yet). I also tried writing the
same image with U-Boot to see if that made any difference and the first
stage bootstrapper doesn't like it either.
> Other than that, you can try debugging the bootloader that's trying to access
> the NAND flash (using OpenOCD + gdb). Good luck with that.
And there lies one of the problems I am suffering. The Atmel RomBOOT is
masked programmed by the factory and Atmel doesn't appear to provide source
code for that either. That is an issue for sure.
>
> --
> Jon Povey
> [email protected]
>
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>
Gary Carlson
Gary Carlson, MSEE
Principal Engineer
Carlson-Minot Inc.
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