[U-Boot] Help with Glomation GESBC-9G20

[Bo Shen]

Hi Larry Baker,

On 06/26/2013 02:02 AM, Larry Baker wrote:
> On 24 Jun 2013, at 1:22 AM, Bo Shen wrote:
>
>> Hi Larry Baker,
>>
>> On 6/24/2013 16:02, Larry Baker wrote:
>>> I have found why the latest U-Boot does not work on my Glomation
>>> GESBC-9G20 board.  Two causes: a bad code text segment address
>>> (prevents U-Boot from executing) and bad flash partition offsets
>>> (prevents U-Boot from reading its environment variables).  The latter
>>> I assume is common, as the flash partition layout can vary.  The
>>> former has to do with where the primary boot loader expects to find
>>> U-Boot's entry point.  The primary boot loader comes from Atmel, I
>>> believe, and I assume does not change.  Yet, the 2011.06 release of
>>> U-Boot changed that address.  (FYI: the two immediately preceding
>>> releases, 2010.12 and 2011.03, fail to compile with configuration
>>> errors.  There were definitely changes taking place during that time
>>> with the Atmel AT91SAM U-Boot code.)  That may be a bug.  I don't
>>> know who the authority on that question would be.  If it is decided
>>> the U-Boot code text segment address is incorrect, it wold be nice to
>>> fix that in the upcoming release.  (If there is time.)
>>
>> For the text base, why we use 0x21f00000 instead of 0x23f00000 is
>> that, the memory only 64MiB on at91sam9g20ek board, if use 0x23f00000
>> as the text base, there is only 1MiB reserved for u-boot use. So, we
>> move down to let more space for u-boot.
>>
>> For the NAND partition, as to the u-boot grow bigger and bigger, so we
>> reserve more space for it.
>>
>> BTW, when you upgrade the u-boot, please also upgrade the bootstrap.
>> we always keep the update bootstrap work with mainline u-boot properly.
>>
>
> Will AT91loader be updated when U-Boot 2013.07 is released?  If not, I
> will put the current AT91loader on my board with U-Boot 2013.04 now.

As Andreas described in previous e-mail, you can find the newest 
bootstrap at [1].

[1] https://github.com/linux4sam/at91bootstrap

Best Regards,
Bo Shen