[U-Boot-Users] How to specify the starting function of aU-boot standalone application.

[Jens Gehrlein <sew_s@tqs.de>]

Hi Jason,

McMullan, Jason schrieb:
> On Wed, 2008-06-25 at 07:44 +0200, Jens Gehrlein wrote:
>> I have the same problem. When I modify the source code the compiler may 
>> or may not rearrange the functions. It is not guaranteed, that the main 
>> function always starts at the same address.
>>
>> How can this be solved? Is it possible/meaningful to put the main 
>> function into a separate linker segment? Any suggestions?
> 
> The simplest way I've found is to make the following C file:
> 
> --- _start.c ---
> void _start(void)
> {
>     extern int main(int argc, char **argv);
>     char *args[] = { "myprogramname", "-foo", "bar", /* etc. etc. */ };
>     main(sizeof(args)/sizeof(args[0]), args);
>     /* Wait forever after the program ends */
>     for (;;);
> }
> -----------------
> 
> Then, link '_start.o' before *any* other objects in your link step.
> 
> Voila! The text entry should be _start!
> 
> Feel free to add BSS initialization, etc. in _start as needed.

Very nice. Thank you for this tip!

Best Regards,
Jens