Support for ATmega2560

- EIND=0 before exiting bootloader.
- Makefile defs for ATmega2560.

Makefile

@@ -3,8 +3,8 @@
 #------------------------------------------------------------------
 # Change these defs for the target device
 
-MCU_TARGET    = atmega1284p # Target device to be used (32K or larger)
-BOOT_ADR      = 0x1F000 # Boot loader start address [byte] NOT [word] as in http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega1284p
+MCU_TARGET    = atmega2560 # Target device to be used (32K or larger)
+BOOT_ADR      = 0x3E000 # Boot loader start address [byte] NOT [word] as in http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega1284p
 F_CPU         = 16000000  # CPU clock frequency [Hz] NOT critical: it just should be higher than the actual Hz 
 SD_CS_PORT    = PORTB # Data Register of the SD CS pin
 SD_CS_DDR     = DDRB # Data Direction Register of the SD CS pin

main.c

@@ -244,7 +244,10 @@ int main (void)
 
                 checkFile();
 
-		if (pgm_read_word(0) != 0xFFFF) ((void(*)(void))0)();	  //EXIT BOOTLOADER
+		if (pgm_read_word(0) != 0xFFFF) {
+			EIND = 0;
+			((void(*)(void))0)();	  //EXIT BOOTLOADER
+		}
 
 		#if USE_UART
 			UART_puts(PSTR("retry"));