RE: [ECOS] Port to XScale board

[Cristiano Ligieri Pereira <cpereira@ics.uci.edu>]

Hi,

I kind of solved my RAM redboot problem (however temporarily since I only
removed the cause of the problem from the code instead of fixing it). I
commented out (till I figure out why) the three function calls that were
crashing... :-|

The first is the call to function __clear_breakpoints() whithin the
function __handle_exception (void), which is located in the file
generic-stub.c. Actually this one I haven't commented out but only defined
CYGNUM_HAL_BREAKPOINT_LIST_SIZE to 0, which in turn makes the function do
not be called. The second and third are the function calls
__data_cache(CACHE_FLUSH) and __instruction_cache(CACHE_FLUSH)
respectively, both within the same function and file, that I literally
commented out. Now I can download a file using GDB/Redboot (running from
RAM) but I can't actually execute it.

I'm downloading the file at the address 0x60000 (at RAM) since Redboot is
located at 0x20000 (right?). The entry point should be reset_vector
(right?), which had to be located in the address 0x64000, but is actually
being mapped to 0x60040. Is this a problem?

Anyways my application is loaded and GDB jumps to 0x60040

Loading section .rom_vectors, size 0x40 lma 0x60000
Loading section .text, size 0xf924 lma 0x60040
Loading section .rodata, size 0x4f0 lma 0x6f964
Loading section .data, size 0x4d4 lma 0x6fe54
Start address 0x60040 , load size 66344
Transfer rate: 40827 bits/sec, 302 bytes/write.

and nothing else happens. I have the LEDs being lightned up (in
vectors.S) but it's not working, what makes me assume that the application
is not being executed.

Am I missing something here? 

Thanks,
Cristiano.

------------------------------------------------------------
Cristiano Ligieri Pereira - http://www.ics.uci.edu/~cpereira

> First of all, you can load programs using RedBoot's "load" command as
> well.
> 
> Try turning on GDB's remote debug facility which will display something
> about what's going on on the communications line.  Note: it will be running
> at the same speed that RedBoot was using, most likely 38400 unless you've
> set it up to run otherwise.
>