AVR Studio 6 und Bootloader

void init (void) __attribute__ ((naked)) __attribute__ ((section (".vectors")));

void init (void) {asm volatile ( "rjmp start" );}

void __do_copy_data (void) __attribute__ ((naked)) __attribute__ ((section (".text9")));

void __do_copy_data (void) {}

void __do_clear_bss (void) __attribute__ ((naked)) __attribute__ ((section (".text9")));

void __do_clear_bss (void) {}

<Hier eventuell einige Funktionen, damit die Sprungadressen klein bleiben>

// PROGMEM ist OK, aber NUR mit folgender Funktion:

// All our PROGMEM data is in the same extended range as the FLASHEND

#define pgm_read_byte_progmem(ptr) pgm_read_byte_far((FLASHEND&0xFFFF0000)|(uint16_t)(ptr))

void start (void) __attribute__ ((naked)) __attribute__ ((section (".init0")));

void start (void) {

    asm volatile ( "ldi  16, %0" :: "i" (RAMEND >> 8) );

    asm volatile ( "out %0,16" :: "i" (AVR_STACK_POINTER_HI_ADDR) );

    asm volatile ( "ldi  16, %0" :: "i" (RAMEND & 0x0ff) );

    asm volatile ( "out %0,16" :: "i" (AVR_STACK_POINTER_LO_ADDR) );

    asm volatile ( "clr __zero_reg__" );                  // GCC depends on register r1 set to 0

    asm volatile ( "out %0, __zero_reg__" :: "I" (_SFR_IO_ADDR(SREG)) );  // set SREG to 0

    // Ab hier normal weiter. Aber Achtung! Keine vorinitialisierten globalen SRAM Variablen!

    mcusr = MCUSR;

    MCUSR = 0;

    wdt_reset();

    wdt_disable();

    ...