[U-Boot-Users] Return values from u-boot to standalone application.

[Laurent Pinchart]

Hi Leonid,
On Monday 29 October 2007 14:34, Leonid wrote:
> Sorry, I forgot to mention that I'm using at91rm9200 CPU (ARM9 from
> Atmel) and u-boot version is 1.2.0 official release. May be there are
> some known issues with standalone application for ARM? Stack getting
> corrupted?
>
> My code is but small variation of standard hello_world (attached) and
> here is output:
>
> U-Boot$ tftp 21000000 $image_path/hello_world.bin; go 21000000;
> TFTP from server 192.168.0.108; our IP address is 192.168.0.205
> Filename 'leonid/ref/images/hello_world.bin'.
> Load address: 0x21000000
> Loading: #
> done
> Bytes transferred = 620 (26c hex)
> ## Starting application at 0x21000000 ...
> Example expects ABI version 3
> Actual U-Boot ABI version 3
> Hello World
> argc = 1
> argv[0] = "21000000"
> argv[1] = "<NULL>"
> main:48 line=help len=553648684
> Hit any key to exit ...
>
> ## Application terminated, rc = 0x0
> U-Boot$
>
> Application is compiled to run from the address 0x21000000 which is the
> middle of RAM.

For what it's worth, 553648684 is 0x2100022c in hex, which is in the middle of 
your application's memory. This either means you end up feeding the function 
address to printf instead of calling the function, or you got a stack/calling 
convention issue.

Best regards,

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussée de Bruxelles, 732A
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Belgium

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