Re: sdcc/PIC howto, first draft is up

On Wed, Jul 20, 2005 at 01:27:17AM +1200, David McNab wrote:

Thanks to the list member that pointed out mutt's mailing list features.
This is my first post using the L command for list reply only.

> Peter Onion wrote:
> >>However, building those exact same sources using my modified crt0 and
> >>linker script, and according to the instructions posted gave me reliable
> >>running programs.
> 
> > What exactly went wrong ?  
> 
> The printf call caused a device reset.
> 
> The lcd test prog either froze or reset at unpredictable stages.
> 
> Again - these problems don't happen with custom crt0/.lnk/Makefile

Peter,

I think you may have missed a key point that David pointed out in his HOWTO.
He us using an 18F bootloader that expects a jump to the main code in the
first 4 words of the program. Most likely this is because those 4 words
are transported to a different located by the bootloader. They are executed
from that location and then jumps to the main.

Where is the original code for crt0. A brief examination can check for this.

David, I think that Peter is correct. Show how to do it with the stock
crt0 then show the bootloader version.

If you get a minute you may want to check the code out yourself. Simply
compile your programs with the normal crt0 then burn the hex file directly to
a chip without using the bootloader. If they work, then the bootloader is
causing the problem.

BAJ