[U-Boot-Users] Need Some Help

[Jerry Van Baren]

Ken.Fuchs at bench.com wrote:
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> 
> Mondesir, Alshine wrote:
> 
>> My latest endeavor has me cross compiling a stand
>> alone application for > MPC8548 PPC for a U-Boot
>> Based target.  There is no Operating System to
>> run on the target to speak of, just my application.
>> I'm building the application in Code Warrior
>> using an 8548_init.S hardware initialization file.
>  
>> 1) My first thought was that this should be as
>> simple as using the .ELF image that codewarrior
>> produces, right?  So I build a simple hello_world
>> application and sent it down to my target.  U-Boot
>> recognizes it as an ELF image, sets up the
>> segments, and tries to run it!  But then low and
>> behold, the U-Boot flash image comes up again. 
>  
>> => bootelf 400000
> 
>> => bootm 400000
>  
>> How do I go about exporting my code warrior
>> application so that I can run it as stand-alone
>> on a U-Boot based target?  Thanks so much
> 
> I suspect that your application is using a device
> or resource that neither U-Boot nor your
> application have properly initialized.
> 
> What is your display device for your hello_world
> application?  Where is this device initialized?
> 
> Sincerely,
> 
> Ken Fuchs

...and are you (Alshine) loading your application in a valid location? 
I see 0x00002000 and following.  I suspect those locations are used by 
your version of u-boot.  You probably want to link your test app at 
0x400000 or somewhere up high like that.

>> => bootelf 400000
>> Loading .init @ 0x00002000 (972 bytes)

[snip]

>> ## Starting application at 0x00002044 ...

gvb