[U-Boot] [RFC PATCH 0/1] SPL JTAG boot mode

[Tom Rini]

On Mon, Aug 11, 2014 at 03:03:35PM +0200, Michal Simek wrote:

> Hi,
> 
> I have got this patch some time ago but I am not still
> 100% sure about use case. Anyway Soren uses this mode
> that's why let me send this patch and we can discuss
> if this can be useful for someone else too.
> 
> The use case is to load U-Boot SPL to do init HW
> and then load images via JTAG because RAM is initialized
> and then run full u-boot.
> There is an option to do HW initialization without
> U-Boot SPL but there are some differences and it is just
> better to directly use code which will run on the board
> when everything is tested.

So in this case, you attach JTAG to the board, halt on reset, reset the
board.  JTAG load in SPL and fiddle memory so that BOOT_DEVICE_JTAG is
set, let SPL run, halt when you see the print (or set a breakpoint for
that part, either way), then load U-Boot via JTAG, resume over the while
loop, and then debug U-Boot as needed?

-- 
Tom
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