[ECOS] Re: linking a program for download to at91sam7x-resident redboot

[John Dallaway <john@dallaway.org.uk>]

Hi Robert

Robert Brusa wrote:

> I have configured, linked and downloaded redboot into my at91sam7x
> board. Its a minimum redboot, supporting only ser0 and ser1 for direct
> download into flash.
> 
> Then I wanted to change my little hello-program by linking it in such a
> way to go above redboot in the flash. Actually I placed it at 0x00120000
> - far above redboot - by editing the ecos-provided target.ld-file. The
> memory-statement in this file now reads like this:
> 
> MEMORY
> {
>     ram : ORIGIN = 0x00200000, LENGTH = 0x20000
>     rom : ORIGIN = 0x00120000, LENGTH = 0x80000
> }
> 
> However, when running the linker, it produces errors and reports vectors
> etc. to be out of rom range. Correct, but I think I do not need these
> vectors here. What else do I have to change in the loader file (or
> elswhere) to get a linked program to be downloadable to/with redboot
> where it will be launched by a cor. redboot command (or a script later
> on)? Thanks for help.

You should be able to specify the desired address of your eCos ROM
startup application image via the CYGNUM_HAL_ARM_AT91_IMAGE_ADDRESS
option which appears to have been implemented for exactly the purpose
you describe.

John Dallaway

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