[U-Boot] [PATCH] arm: at91: support for the Calao USB-A9263 board (based on AT91SAM9263)

[Heiko Schocher]

Hello Mateusz,

Am 28.10.2013 22:30, schrieb Mateusz Kulikowski:
> Hi Bo Shen,
>
> Thanks for the check, please see below.
>
> On 28.10.2013 05:57, Bo Shen wrote:
>> Hi Mateusz Kulikowski,
>> Add Andreas in loop.
>>
>> On 10/28/2013 03:34, Mateusz Kulikowski wrote:
> (...)
[...]
>>> +#define CONFIG_SYS_TEXT_BASE 0x23f00000
>>
>> This address should be considered as u-boot is top down map, so if your system only 64MiB, there is only 1MiB left.
>
> I don't understand something here:
> - this address is hardcoded in AT91bootstrap (as well as image size - 0x31000),

Do you have the source code?

> - I can change it, but it will not boot on "stock" board - should we force
> people to recompile AT91bootstrap if they want to use new U-Boot?

Not the preferred way ...

> or
> - Should I add low-level initialization to boot U-Boot from Dataflash
> without AT91bootstrap (this is a bit more work)?

Thats the way I would prefer! We decided for the siemens at91 board
ports I recently posted, see here:

[U-Boot,v1,1/3] at91: add defines for reset type
http://patchwork.ozlabs.org/patch/285365/

[U-Boot,v1,2/3] arm, at91: add Siemens board taurus (based on AT91SAM9G20)
http://patchwork.ozlabs.org/patch/285366/

[U-Boot,v1,3/3] arm, at91: add siemens corvus board
http://patchwork.ozlabs.org/patch/285367/

to start a try using spl instead of at91bootstrap. I hope to get this
ASAP (serial output works :-) running and post a RFC patch. They boot
from NAND but that should be no big problem to add dataflash support ...

> or
> - There is another way I'm not aware of (perhaps relocate U-Boot in RAM)?

You need always some first stage bootloader, currently this is
at91bootstrap, but we should integrate this into U-Boot SPL code ...

U-Boot gets relocated in RAM, but that is later in the boot process...

bye,
Heiko
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