Re: [avr-gcc-list] jmp boot loader

[Yannick PODGORSKI]

I try but when I use "rjmp"  :
       -Wl, --defsym=app_start=0 in Makefile
and
       asm volatile("rjmp app_start"); in code

I try but when I use "rjmp" there is an error :

   bootldr.o(.text+0x280): In function `BootLoader':
   /home/avr-boot2/bootldr.c:315: relocation truncated to fit: 
R_AVR_13_PCREL no symbol
   make: *** [main.elf] Erreur 1

I try with "jmp" and there is no error but the result is the same. The 
program restart
to boot section and not application section.
Very strange.
Thanks for your answer.

Yannick PODGORSKI


----- Original Message ----- 
From: "Matthias Weißer" <address@hidden>
To: "Yannick PODGORSKI" <address@hidden>
Sent: Thursday, December 30, 2004 9:42 PM
Subject: Re: [avr-gcc-list] jmp boot loader


> Yannick PODGORSKI schrieb:
> > asm volatile ("jmp 0"); // to start application but It restarts to boot 
> > section (not application section).
>
> I had similar problems with a Mega8 bootloader and solved it (with some 
> hints by Joerg Wunsch) this way:
>
> Replaced
> asm volatile("rjmp 0");
> with
> asm volatile("rjmp app_start");
>
> and defined a linker symbol "app_start" at the linker command line:
> -Wl,...,--defsym=app_start=0
>
> Worked for me.
>
> --
> Matthias Weißer
> address@hidden
> http://www.matwei.de