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

[Leonid]

The problem was in the order of gd->jt[] array initialization. I did it too early and in common/exports.c it was filled by dummy function address.

Thanks,

Leonid.

-----Original Message-----
From: u-boot-users-bounces at lists.sourceforge.net [mailto:u-boot-users-bounces at lists.sourceforge.net] On Behalf Of Leonid
Sent: Monday, October 29, 2007 7:45 AM
To: Laurent Pinchart; u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Return values from u-boot to standaloneapplication.

Hi, Laurent:

You are right regarding value. The interesting thing though is that functions which have been exported by u-boot traditionally (say, getenv() or getc()) return correct value in standalone application.

However all string related functions I have tried to export (strlen(), strchr(), etc...) are not so. I think I did everything the same way it's done for other functions...

Thanks,

Leonid.

-----Original Message-----
From: Laurent Pinchart [mailto:laurentp at cse-semaphore.com]
Sent: Monday, October 29, 2007 6:47 AM
To: u-boot-users at lists.sourceforge.net
Cc: Leonid
Subject: Re: [U-Boot-Users] Return values from u-boot to standalone application.

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
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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