flash unsigned char rtl8019as_resetting[]={"RTL8019AS resetting ..."};

//Собственно функция
void show_flash_string (flash unsigned char *start_addr, unsigned int string_size)
{
unsigned int i;
for (i=0;i<string_size;i++) putchar(*(start_addr + i));
}

//Вызываем функцию:
show_flash_string(&rtl8019as_resetting[0], sizeof(rtl8019as_resetting));