[U-Boot] loading via jtag

[Frank Svendsbøe]

On Thu, Jul 2, 2009 at 3:32 PM, E Robertson<e.robertson.svg at gmail.com> wrote:
> On Thursday 02 July 2009 02:22:16 am Frank Svendsbøe wrote:
>> On Thu, Jul 2, 2009 at 6:10 AM, E Robertson<e.robertson.svg at gmail.com>
> wrote:
>> > Hi All,
>> > Has anyone used the JTAG like the BDI2000 to load u-boot onto a
>> > at91sam9263? I've done it on other boards but some some reason the
>> > code will not execute
>> > from on board SDRAM. To avoid initializing the external memory via
>> > jtag, I use the bootstrap code to do the setup then load u-boot and
>> > run it.
>> > For reason(s) I haven't figured out yet, the code will not external
>> > memory. Has anyone done this before and can provide some help?
>> > Thanks.
>>
>> How come you want to execute it from RAM? Is the board without flash?
>> Could you instead replace the "bootstrap" loader with U-Boot?
>>
>> It the SDRAM controller is already setup, I guess you must recode U-Boot
>> and tell it not to touch/re-initialize the memory controller...
>>
>> Btw, look at
>> http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStarte
>>dInRAM
>>
>> - Frank
>
>
> In this case, I believe things are a bit different. U-boot is not relocated
> because the bootstrap already does this and the bootstrap does all the init
> needed to set up ram (among other things). I'm tracking a problem which is why
> I'm trying to run it from ram. I've done quite a bit of modifications to the
> point where I believe this should work, but apparently I may have overlooked
> something.
>

Ok. The BDI makes it possible to debug U-Boot so that you can pinpoint where the
problem occur. Have you tried that yet, and what exactly is the
problem you observe?

Try to be more specific, then some of the Gurus here may be able to help you.
Good luck!

- Frank