Re: Purpose of startup files for ARM

[yuwen <yuwen at micetek dot com dot cn>]

David Mc Kenna wrote:

> Hi folks,
>
> Does anyone know what the standard startup files, excluded by using the command
> -nostartfiles, are expected to do and if they are necessary? 
>
> The reason I ask is that I have a chip with no ANGEL, or similar monitor, on
> board, and the startup routines included by GCC by default includes SWI calls
> with codes which suggest a monitor is used.
>  
In this case, you can write your own crt0.S.  crt0.S does the following  
work:
initialize the hardware, e.g., the SDRAM
set the sp register to some place in the higher memory
initialize the .bss sections
copy the .data section from ROM to RAM if you're writing a rom application
call the main function

Do you have ADS or SDT documentation? There're examples on how to write 
crt0.S.

Best regards,
Dai Yuwen





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