painted stack measure do not work

[pat1]

The routine mu_StackPaint is not executed in section .init1 I use platformio and board = 1284p16m better results with this approach: https://www.avrfreaks.net/comment/1314296#comment-1314296 with little modification to take in account heap:

extern uint8_t _end;

void simpleStackPaint(void)
{
    uint8_t *p = &_end;

    while(p < (uint8_t*)&p)
    {
        *p = 0xc5;
        p++;
    }
} 

uint16_t simpleStackCount(void)
{
  const uint8_t *p =  (int) (__brkval == 0 ? (uint8_t *) &__heap_start : __brkval);
  //const uint8_t *p = &_end;
    uint16_t       c = 0;

    while(*p == 0xc5 && p < (uint8_t*)&p)
    {
        p++;
        c++;
    }

    return c;
}