what is the earliest i can get MLO to print out debugging info?

[Sascha Hauer]

On Fri, Feb 10, 2012 at 07:59:08AM -0500, Robert P. J. Day wrote:
> 
>   as a (sort of) followup to my last post on extending barebox to
> recognize pandaboards, at the moment, i have a build that boots nicely
> on an original panda but produces absolutely *no* output at all on a
> panda ES.
> 
>   i know that barebox currently doesn't recognize the ES, but i'm
> wondering if that's the real problem, and where i can put debugging
> statements in to show something along the lines of, "hi, i'm just
> starting to run MLO".
> 
>   surely there's an initial part of MLO that has to run before even
> checking the revision of the board, so can i add some debugging that
> would show that, or is it not even possible to set up the console
> before recognizing the board?  thanks.

Is there a LED on the board? Then you could use it for bisecting the
code. Setting up a console is not that easy as it may require setting
up the iomuxer. Another way would be to setup a regular U-Boot on the
board and start the MLO from there. Then you can just do a writel to
the UARTs tx register.

Sascha

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