AW: [avr-gcc-list] avr-c++ static constructors in bootloader usage

[Haase Bjoern (PT-BEU/EMT)]

Is it possible that you forgot about setting the data direction register 
properly?

I'd like to suggest that you have a look at the generated assembly code. E.g. 
by excecuting

avr-objdump.exe -d myfile.elf

The place where the reset vector jumps to will first initialize RAM memory 
contents and then jump to all of the static constructor functions (there is a 
table with all of them in memory).

With a program as short as yours, you should easily be able to follow the code. 
BTW. Main() probably never should be reached with your small program.

HTH,

Bjoern.

-----Ursprüngliche Nachricht-----
Von: address@hidden [mailto:address@hidden Im Auftrag von Jörg Diederich
Gesendet: Dienstag, 19. September 2006 16:09
An: address@hidden
Betreff: [avr-gcc-list] avr-c++ static constructors in bootloader usage

hello,

so i'm new to this list, a short hello (again) to everyone.

in using the at90can128, there's a problem with static constructors in 
bootloaders. the following example does not work as expected.

#include <avr/io.h>
/*
  PORTE rises a pin on my board. used to see what's happening
 */
class A {
 public:
  A(){
    PORTE |= (1 << 7);
    while(1);
  }
};

A a_test ;
int 
main(int argc, char** args)
{
  PORTE |= (1 << 2);
  while(1);

  return 0;
}

both pins stay low. usart-output didn't work too.
adress of bootloader/text-section is 0x1E000. another possible start address 
(0x1F000) doesn't change the problem,
never tryed last possible address (0x1F800), but i don't expect it to work 
either.

trying to switch off most compiler options doesn't result in a change.
gcc version 4.1.1, avr-libc 1.4.4

there's a bug-report at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29141 for 
this.

bye Jörg


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