[U-Boot] Problem with stand-alone apps

[James Chargin]

On 08/28/2013 08:07 AM, ANDY KENNEDY wrote:
> All,
>
> In an effort to play by the rules, we created a stand alone app that
> handles breaking the boot process with bootdelay set to 0.  We require
> a special key sequence to break into the boot process to ensure security,
> and to ensure we do not interrupt the boot process with stray key strokes.
> We are seeing strange behavior from our applet.  There are several API
> calls that we make from within the app that seem to make our processor
> go into a code violation error (even something as simple as a printf).

I'm using a much older version of U-Boot (2010.12) for the P1022. I was 
seeing some flakiness a while back. My problems were solved when I 
started using "bootm" to start my stand alone application, rather than 
"go". I don't know if this might be your problem but I thought it better 
to provide an attempt at help rather than nothing.

This change was prompted by an extended mailing list discussion starting 
with an email from York Sun on 19Mar2013 (Message-ID: 
<1363724992-9803-1-git-send-email-yorksun at freescale.com>).

I added some short sections to the wiki about my experiences. See 
http://www.denx.de/wiki/view/DULG/UBootStandalone#Section_5.12.3.

Jim

>
> It seems that things were working better in 2010.12.  We chose to move
> to 2013.04 for some additional fixes that we saw were pushed in by
> Freescale.  BTW, this is also similar to my previous e-mail thread that
> I started a month or so ago in which I stated there was general flakiness.
> We are reasonably confidant that our timing for our NOR flash is correct.
> Likewise, for our DDR3.  Both of these sets of parameters were done with
> the aid of Freescale themselves (given the tool they were using this is
> unlikely).
>
> Anyone else use the stand alone applications in 2013.04 successfully?
>
> Thanks,
> Andy
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>

-- 
Jim Chargin
AJA Video Systems                       jimc at aja.com
(530) 271-3334                          http://www.aja.com