diff --git a/Makefile b/Makefile
index c986e90..5c50663 100644
--- a/Makefile
+++ b/Makefile
@@ -3,25 +3,31 @@
 #------------------------------------------------------------------
 # 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    = atmega644p # Target device to be used (32K or larger)
+BOOT_ADR      = 0xF000 # Boot loader start address [byte] NOT [word] as in http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega644p
 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
 SD_CS_BIT     = 4 # Bit of the SD CS pin
 USE_LED       = 0 # Debug with two (defined in asmfunc.S)
 USE_UART      = 0 # Debug on Serial. 0 ... deactivate or divider of http://wormfood.net/avrbaudcalc.php for baud rate!
+USE_SERIAL_FLASHING    = 1 # Enable experimental serial flashing support. Currently only atmega328p is supported.
+USE_FAT16     = 0 # Enable Fat16 support, disabled by default. If enabled, disable Fat32 to keep size of bootloader within limits 
+USE_FAT32     = 1 # Enable Fat32 support, enabled by default to allow the use of sd cards > 2GB
 #------------------------------------------------------------------
-ifeq ($(strip $(USE_UART)),0)
+
 CSRC        = main.c pff/src/pff.c diskio.c
-else
-CSRC        = main.c pff/src/pff.c diskio.c uart/uart.c
+ifneq ($(strip $(USE_UART)),0)
+CSRC        +=  uart/uart.c
+endif
+ifneq ($(strip $(USE_SERIAL_FLASHING)),0)
+CSRC        +=  uart/uart.c stk500v1.c prog_flash.c
 endif
 
 TARGET      = avr_boot
 ASRC        = asmfunc.S
-OPTIMIZE    = -Os -mcall-prologues -ffunction-sections -fdata-sections
-DEFS        = -DBOOT_ADR=$(BOOT_ADR) -DF_CPU=$(F_CPU) -DUSE_LED=$(USE_LED) -DUSE_UART=$(USE_UART) -DSD_CS_PORT=$(SD_CS_PORT) -DSD_CS_DDR=$(SD_CS_DDR) -DSD_CS_BIT=$(SD_CS_BIT)
+OPTIMIZE    = -Os -mcall-prologues -ffunction-sections -fdata-sections -fwhole-file -flto -funsigned-char -fno-split-wide-types -fno-inline-small-functions -ffreestanding -fno-jump-tables
+DEFS        = -DBOOT_ADR=$(BOOT_ADR) -DF_CPU=$(F_CPU) -DUSE_LED=$(USE_LED) -DUSE_UART=$(USE_UART) -DSD_CS_PORT=$(SD_CS_PORT) -DSD_CS_DDR=$(SD_CS_DDR) -DSD_CS_BIT=$(SD_CS_BIT) -DUSE_SERIAL_FLASHING=$(USE_SERIAL_FLASHING) -DUSE_FAT16=$(USE_FAT16) -DUSE_FAT32=$(USE_FAT32)
 LIBS        =
 DEBUG       = dwarf-2
 
diff --git a/board-arduino.h b/board-arduino.h
new file mode 100644
index 0000000..1c60e5c
--- /dev/null
+++ b/board-arduino.h
@@ -0,0 +1,63 @@
+/**********************************************************/
+/* board-arduino.h                                        */
+/* Copyright (c) 2010 by thomas seiler                    */
+/* -------------------------------------------------------*/
+/*                                                        */
+/* This program is free software; you can redistribute it */
+/* and/or modify it under the terms of the GNU General    */
+/* Public License as published by the Free Software       */
+/* Foundation; either version 2 of the License, or        */
+/* (at your option) any later version.                    */
+/*                                                        */
+/* This program is distributed in the hope that it will   */
+/* be useful, but WITHOUT ANY WARRANTY; without even the  */
+/* implied warranty of MERCHANTABILITY or FITNESS FOR A   */
+/* PARTICULAR PURPOSE.  See the GNU General Public        */
+/* License for more details.                              */
+/*                                                        */
+/* You should have received a copy of the GNU General     */
+/* Public License along with this program; if not, write  */
+/* to the Free Software Foundation, Inc.,                 */
+/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
+/*                                                        */
+/* Licence can be viewed at                               */
+/* http://www.fsf.org/licenses/gpl.txt                    */
+/**********************************************************/
+
+
+#ifndef _board_h_
+#define _board_h_
+
+/* define BAUD_RATE
+ * This is the baud rate for the serial port.
+ * The original Makefile seemed to use 19200 by default, and
+ * 57600 if the target was a atmega328p or atmega1280
+ */
+#if   defined(__AVR_ATmega328P__) || defined(__AVR_ATmega1280__)
+ #define BAUD_RATE 19200
+ #if F_CPU <= 8000000L
+  #define DOUBLE_SPEED
+ #endif
+#else
+ #define BAUD_RATE 19200
+#endif
+
+
+/* define MAX_TIME_COUNT
+ * This is the maximum amount of time that the bootloader waits for
+ * serial activity before launching the main_app.
+ * The original Makefile seemed to use  F_CPU>>4 in all cases, except for
+ * ng and lillypad, where F_CPU>>1 was used. (which is longer!)
+ * I think using F_CPU>>4 for all board is ok for this generic arduino header.
+ */
+#define MAX_TIME_COUNT F_CPU>>4
+
+/* LED
+ * This will be used to blink a LED during flashing
+ *
+ */
+
+#define LED_PORT
+#define LED_PIN
+
+#endif
diff --git a/build/atmega1284p_cs4_16000000L_serial_fat32.hex b/build/atmega1284p_cs4_16000000L_serial_fat32.hex
new file mode 100644
index 0000000..29da247
--- /dev/null
+++ b/build/atmega1284p_cs4_16000000L_serial_fat32.hex
@@ -0,0 +1,253 @@
+:020000021000EC
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diff --git a/build/atmega128_cs10_16000000L_serial_fat16.hex b/build/atmega128_cs10_16000000L_serial_fat16.hex
new file mode 100644
index 0000000..30c46ba
--- /dev/null
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new file mode 100644
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diff --git a/build/atmega128_cs4_16000000L_serial_fat16.hex b/build/atmega128_cs4_16000000L_serial_fat16.hex
new file mode 100644
index 0000000..6793d1a
--- /dev/null
+++ b/build/atmega128_cs4_16000000L_serial_fat16.hex
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diff --git a/build/atmega128_cs4_16000000L_serial_fat32.hex b/build/atmega128_cs4_16000000L_serial_fat32.hex
new file mode 100644
index 0000000..e508776
--- /dev/null
+++ b/build/atmega128_cs4_16000000L_serial_fat32.hex
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diff --git a/build/atmega128_cs8_16000000L_serial_fat16.hex b/build/atmega128_cs8_16000000L_serial_fat16.hex
new file mode 100644
index 0000000..269dd1e
--- /dev/null
+++ b/build/atmega128_cs8_16000000L_serial_fat16.hex
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diff --git a/build/atmega128_cs8_16000000L_serial_fat32.hex b/build/atmega128_cs8_16000000L_serial_fat32.hex
new file mode 100644
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diff --git a/build/atmega328p_cs10_16000000L_serial_fat16.hex b/build/atmega328p_cs10_16000000L_serial_fat16.hex
new file mode 100644
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--- /dev/null
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diff --git a/build/atmega328p_cs10_16000000L_serial_fat32.hex b/build/atmega328p_cs10_16000000L_serial_fat32.hex
new file mode 100644
index 0000000..7ffb5e9
--- /dev/null
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diff --git a/build/atmega328p_cs4_16000000L_serial_fat16.hex b/build/atmega328p_cs4_16000000L_serial_fat16.hex
new file mode 100644
index 0000000..7a08909
--- /dev/null
+++ b/build/atmega328p_cs4_16000000L_serial_fat16.hex
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diff --git a/build/atmega328p_cs4_16000000L_serial_fat32.hex b/build/atmega328p_cs4_16000000L_serial_fat32.hex
new file mode 100644
index 0000000..9b67639
--- /dev/null
+++ b/build/atmega328p_cs4_16000000L_serial_fat32.hex
@@ -0,0 +1,248 @@
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diff --git a/build/atmega328p_cs8_16000000L_serial_fat16.hex b/build/atmega328p_cs8_16000000L_serial_fat16.hex
new file mode 100644
index 0000000..b67cca3
--- /dev/null
+++ b/build/atmega328p_cs8_16000000L_serial_fat16.hex
@@ -0,0 +1,234 @@
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diff --git a/build/atmega328p_cs8_16000000L_serial_fat32.hex b/build/atmega328p_cs8_16000000L_serial_fat32.hex
new file mode 100644
index 0000000..145e79b
--- /dev/null
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new file mode 100644
index 0000000..2611957
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+:10FF2000AA81B981CE0FD11D0FB6F894DEBF0FBEE6
+:10FF3000CDBFED010895A29FB001B39FC001A39F63
+:10FF4000700D811D1124911DB29F700D811D112412
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+:040000030000F00009
+:00000001FF
diff --git a/main.c b/main.c
index 97da7b4..b4fb63a 100644
--- a/main.c
+++ b/main.c
@@ -58,6 +58,8 @@ void disable_watchdog(void)
 #include "pff/src/pff.h"
 
 
+
+
 #if BOOT_ADR > 0xFFFF
   #define PGM_READ_BYTE(x) pgm_read_byte_far(x)
 #else
@@ -68,6 +70,12 @@ void disable_watchdog(void)
   #include "uart/uart.h"
 #endif
 
+#if USE_SERIAL_FLASHING
+    #include "stk500v1.h"
+    #include <inttypes.h>
+    #include "prog_flash.h"
+#endif
+
 #if USE_LED
 void init_leds();
 void led_power_on();
@@ -222,10 +230,7 @@ void checkFile() {
 
 
 
-
-
-int main (void)
-{
+int main (void) {
 	#if USE_LED
           init_leds();
           uint8_t i=0;
@@ -236,6 +241,13 @@ int main (void)
 	  UART_puts(PSTR("AVR_BOOT"));
           UART_newline();
 	#endif
+          
+#if USE_SERIAL_FLASHING
+    // First try serial flashing
+    if (stk500v1() == 1 && pgm_read_word(0) != 0xFFFF) ((void(*)(void))0)();	  //EXIT BOOTLOADER
+#endif
+    
+    // Then try mmc, if serial flashing failed
 	while (1) {
                 #if USE_LED
                   led_power_on();_delay_ms(200);led_power_off();  //Test Power Led
diff --git a/pff/src/pffconf.h b/pff/src/pffconf.h
index d6b984e..30d9af6 100644
--- a/pff/src/pffconf.h
+++ b/pff/src/pffconf.h
@@ -15,9 +15,18 @@
 #define	_USE_WRITE	0	/* Enable pf_write() function */
 
 #define _FS_FAT12	0	/* Enable FAT12 */
-#define _FS_FAT16	1	/* Enable FAT16 */
-#define _FS_FAT32	1	/* Enable FAT32 */
 
+#if USE_FAT16
+    #define _FS_FAT16	1	/* Enable FAT16 */
+#else
+    #define _FS_FAT16	0	/* Disable FAT16 */
+#endif
+
+#if USE_FAT32
+    #define _FS_FAT32	1	/* Enable FAT32 */
+#else
+    #define _FS_FAT32	0	/* Disable FAT32 */
+#endif
 
 /*---------------------------------------------------------------------------/
 / Locale and Namespace Configurations
diff --git a/prog_flash.c b/prog_flash.c
new file mode 100644
index 0000000..e082e0f
--- /dev/null
+++ b/prog_flash.c
@@ -0,0 +1,65 @@
+/**********************************************************/
+/* prog_flash.c                                           */
+/* Copyright (c) 2010 by thomas seiler                    */ 
+/* write to the internal flash of the uC                  */
+/*                                                        */
+/* -------------------------------------------------------*/
+/*                                                        */
+/* This program is free software; you can redistribute it */
+/* and/or modify it under the terms of the GNU General    */
+/* Public License as published by the Free Software       */
+/* Foundation; either version 2 of the License, or        */
+/* (at your option) any later version.                    */
+/*                                                        */
+/* This program is distributed in the hope that it will   */
+/* be useful, but WITHOUT ANY WARRANTY; without even the  */
+/* implied warranty of MERCHANTABILITY or FITNESS FOR A   */
+/* PARTICULAR PURPOSE.  See the GNU General Public        */
+/* License for more details.                              */
+/*                                                        */
+/* You should have received a copy of the GNU General     */
+/* Public License along with this program; if not, write  */
+/* to the Free Software Foundation, Inc.,                 */
+/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
+/*                                                        */
+/* Licence can be viewed at                               */
+/* http://www.fsf.org/licenses/gpl.txt                    */
+/**********************************************************/
+
+#include "prog_flash.h"
+#include <avr/boot.h>
+
+/* page buffer ---------------------------------------------------- */
+uint8_t pagebuffer[SPM_PAGESIZE];
+
+
+/* address buffer */
+#ifdef LARGE_ADDR_SPACE
+uint32_t address;
+#else
+uint16_t address;
+#endif
+
+/* access to flash memory------------------------------------------ */
+
+void write_flash_page()
+{
+	uint16_t i = 0;
+
+	eeprom_busy_wait ();
+
+	boot_page_erase (address);
+	boot_spm_busy_wait ();      // Wait until the memory is erased.
+
+	for (i=0; i<SPM_PAGESIZE; i+=2)
+	{
+		// Set up little-endian word.
+		uint16_t w = *((uint16_t*)(pagebuffer + i));
+		boot_page_fill (address + i, w);
+	}
+
+	boot_page_write(address);     // Store buffer in flash page.
+	boot_spm_busy_wait();            // Wait until the memory is written.
+
+	boot_rww_enable ();
+}
diff --git a/prog_flash.h b/prog_flash.h
new file mode 100644
index 0000000..208c42c
--- /dev/null
+++ b/prog_flash.h
@@ -0,0 +1,44 @@
+/**********************************************************/
+/* prog_flash.h                                           */
+/* Copyright (c) 2010 by thomas seiler                    */ 
+/* write to the internal flash of the uC                  */
+/*                                                        */
+/* -------------------------------------------------------*/
+/*                                                        */
+/* This program is free software; you can redistribute it */
+/* and/or modify it under the terms of the GNU General    */
+/* Public License as published by the Free Software       */
+/* Foundation; either version 2 of the License, or        */
+/* (at your option) any later version.                    */
+/*                                                        */
+/* This program is distributed in the hope that it will   */
+/* be useful, but WITHOUT ANY WARRANTY; without even the  */
+/* implied warranty of MERCHANTABILITY or FITNESS FOR A   */
+/* PARTICULAR PURPOSE.  See the GNU General Public        */
+/* License for more details.                              */
+/*                                                        */
+/* You should have received a copy of the GNU General     */
+/* Public License along with this program; if not, write  */
+/* to the Free Software Foundation, Inc.,                 */
+/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
+/*                                                        */
+/* Licence can be viewed at                               */
+/* http://www.fsf.org/licenses/gpl.txt                    */
+/**********************************************************/
+
+#ifndef _prog_flash_h_
+#define _prog_flash_h_
+
+#include <avr/io.h>   /* for SPM_PAGESIZE */
+#include <inttypes.h>
+
+extern uint8_t pagebuffer[SPM_PAGESIZE];
+void write_flash_page();
+
+#ifdef LARGE_ADDR_SPACE
+extern uint32_t address;
+#else
+extern uint16_t address;
+#endif
+
+#endif
diff --git a/stk500v1.c b/stk500v1.c
new file mode 100644
index 0000000..6b4d901
--- /dev/null
+++ b/stk500v1.c
@@ -0,0 +1,468 @@
+/**********************************************************/
+/* stk500v1.c                                             */
+/* Copyright (c) 2010 by thomas seiler                    */ 
+/* Implementation of the AVR STK500v1 protocol            */
+/* Inspired by the original Arduino Bootloader code,      */
+/* But heavily rewritten for smaller code size            */
+/*                                                        */
+/* -------------------------------------------------------*/
+/*                                                        */
+/* This program is free software; you can redistribute it */
+/* and/or modify it under the terms of the GNU General    */
+/* Public License as published by the Free Software       */
+/* Foundation; either version 2 of the License, or        */
+/* (at your option) any later version.                    */
+/*                                                        */
+/* This program is distributed in the hope that it will   */
+/* be useful, but WITHOUT ANY WARRANTY; without even the  */
+/* implied warranty of MERCHANTABILITY or FITNESS FOR A   */
+/* PARTICULAR PURPOSE.  See the GNU General Public        */
+/* License for more details.                              */
+/*                                                        */
+/* You should have received a copy of the GNU General     */
+/* Public License along with this program; if not, write  */
+/* to the Free Software Foundation, Inc.,                 */
+/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
+/*                                                        */
+/* Licence can be viewed at                               */
+/* http://www.fsf.org/licenses/gpl.txt                    */
+/**********************************************************/
+
+#include <inttypes.h>
+#include "board-arduino.h"
+#include "stk500v1.h"
+/* define this to loose a bit compatibility, but save a few bytes */
+#define MINIMALISTIC
+
+/* BAUD_RATE must be defined in board.h */
+
+/* for the SIGNATURE_X macros, and uart pins */
+#include <avr/io.h>
+
+/* access to the pagebuffer */
+#include "prog_flash.h"
+
+/* we need to read/write the eeprom */
+#if !defined(__AVR_ATmega168__) || !defined(__AVR_ATmega328P__)
+#include <avr/eeprom.h>
+#endif
+
+/* we need to read the flash */
+#include <avr/pgmspace.h>
+
+
+/* use the global pagebuffer as scratch pad */
+
+/* some variables */
+union length_union {
+	uint16_t word;
+	uint8_t  byte[2];
+} length;
+
+struct flags_struct { // changed from a packed struct to save some bytes
+	uint8_t eeprom;
+} flags;
+
+/* uart stuff --------------------------------------------*/
+
+#if defined (__AVR_ATmega128__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1280__) || defined (__AVR_ATmega1284__)
+//Select UART to use on multi-uart systems
+static const uint8_t bootuart = 0;
+#endif
+
+static inline void setup_uart() {
+
+	/* initialize UART(s) depending on CPU defined */
+
+#if defined (__AVR_ATmega128__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1280__) || defined (__AVR_ATmega1284__)
+
+	if(bootuart == 0) {
+		UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+		UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+		UCSR0A = 0x00;
+		UCSR0C = 0x06;
+		UCSR0B = _BV(TXEN0)|_BV(RXEN0);
+	}
+	if(bootuart == 1) {
+		UBRR1L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+		UBRR1H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+		UCSR1A = 0x00;
+		UCSR1C = 0x06;
+		UCSR1B = _BV(TXEN1)|_BV(RXEN1);
+	}
+
+#ifdef __AVR_ATmega1280__
+	if (bootuart == 2) {
+		UBRR2L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+		UBRR2H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+		UCSR2A = 0x00;
+		UCSR2C = 0x06;
+		UCSR2B = _BV(TXEN2)|_BV(RXEN2);
+	}
+	if (bootuart == 3) {
+		UBRR3L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+		UBRR3H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+		UCSR3A = 0x00;
+		UCSR3C = 0x06;
+		UCSR3B = _BV(TXEN3)|_BV(RXEN3);
+	}
+
+	/* Enable internal pull-up resistor on E0 (RX), in order
+	 * to suppress line noise that prevents the bootloader from timing out.
+	 */
+	DDRE &= ~_BV(PINE0);
+	PORTE |= _BV(PINE0);
+#endif
+
+#elif defined __AVR_ATmega163__
+	UBRR = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+	UBRRHI = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+	UCSRA = 0x00;
+	UCSRB = _BV(TXEN)|_BV(RXEN);	
+#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega328P__)
+#ifdef DOUBLE_SPEED
+	UCSR0A = (1<<U2X0); //Double speed mode USART0
+	UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*8L)-1);
+	UBRR0H = (F_CPU/(BAUD_RATE*8L)-1) >> 8;
+#else
+	UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+	UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+#endif
+
+	UCSR0B = (1<<RXEN0) | (1<<TXEN0);
+	UCSR0C = (1<<UCSZ00) | (1<<UCSZ01);
+
+	/* Enable internal pull-up resistor on pin D0 (RX), in order
+	to supress line noise that prevents the bootloader from
+	timing out (DAM: 20070509) */
+	DDRD &= ~_BV(PIND0);
+	PORTD |= _BV(PIND0);
+#elif defined __AVR_ATmega8__
+	/* m8 */
+	UBRRH = (((F_CPU/BAUD_RATE)/16)-1)>>8; 	// set baud rate
+	UBRRL = (((F_CPU/BAUD_RATE)/16)-1);
+	UCSRB = (1<<RXEN)|(1<<TXEN);  // enable Rx & Tx
+	UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);  // config USART; 8N1
+#else
+	/* m16,m32,m169,m8515,m8535 */
+	UBRRL = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
+	UBRRH = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
+	UCSRA = 0x00;
+	UCSRC = 0x06;
+	UCSRB = _BV(TXEN)|_BV(RXEN);
+#endif
+}
+
+static void putch(char ch)
+{
+	/* send a byte to UART depending on CPU defined */
+
+#if defined (__AVR_ATmega128__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1280__) || defined (__AVR_ATmega1284__)
+	if(bootuart == 0) {
+		while (!(UCSR0A & _BV(UDRE0)));
+		UDR0 = ch;
+	}
+	else if (bootuart == 1) {
+		while (!(UCSR1A & _BV(UDRE1)));
+		UDR1 = ch;
+	}
+#ifdef __AVR_ATmega1280__
+	else if (bootuart == 2) {
+		while (!(UCSR2A & _BV(UDRE2)));
+		UDR2 = ch;
+	}
+	else if (bootuart == 3) {
+		while (!(UCSR3A & _BV(UDRE3)));
+		UDR3 = ch;
+	}
+#endif
+#elif defined(__AVR_ATmega168__)  || defined(__AVR_ATmega328P__)
+	while (!(UCSR0A & _BV(UDRE0)));
+	UDR0 = ch;
+#else
+	/* m8,16,32,169,8515,8535,163 */
+	while (!(UCSRA & _BV(UDRE)));
+	UDR = ch;
+#endif
+}
+
+
+static char getch(void)
+{
+	uint32_t count = 0;
+	/* read a byte from UART depending on CPU defined */
+
+#if defined (__AVR_ATmega128__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1280__) || defined (__AVR_ATmega1284__)
+	if(bootuart == 0) {
+		while(!(UCSR0A & _BV(RXC0))) {
+			count++;
+			if (count > MAX_TIME_COUNT) {
+				return 0xFF;
+			}
+		}
+		return UDR0;
+	}
+	else if(bootuart == 1) {
+		while(!(UCSR1A & _BV(RXC1))) {
+			count++;
+			if (count > MAX_TIME_COUNT) {
+				return 0xFF;
+			}
+		}
+		return UDR1;
+	}
+#ifdef __AVR_ATmega1280__
+	else if (bootuart == 2) {
+		while (!(UCSR2A & _BV(RXC2))) {
+			count++;
+			if (count > MAX_TIME_COUNT) {
+				return 0xFF;
+			}
+		}
+		return UDR2;
+	}
+	else if (bootuart == 3) {
+		while (!(UCSR3A & _BV(RXC3))) {
+			count++;
+			if (count > MAX_TIME_COUNT) {
+				return 0xFF;
+			}
+		}
+		return UDR3;
+	}
+	return 0xFF;
+#endif
+
+#elif defined(__AVR_ATmega168__)  || defined(__AVR_ATmega328P__)
+	while(!(UCSR0A & _BV(RXC0))){
+		/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
+		/* HACKME:: here is a good place to count times*/
+		count++;
+		if (count > MAX_TIME_COUNT) { 
+			return 0xFF;
+	  	}
+	}
+
+	return UDR0;
+#else
+	/* m8,16,32,169,8515,8535,163 */
+	while(!(UCSRA & _BV(RXC))){
+		/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/               
+		/* HACKME:: here is a good place to count times*/
+		count++;
+		if (count > MAX_TIME_COUNT) {
+			return 0xFF;
+	  	}
+	}
+	return UDR;
+#endif
+}
+
+
+/* handle the different commands ----------------------- */
+
+#ifndef MINIMALISTIC
+static inline void handle_programmerID(void) {
+	putch('A');  /* this is smaller than a string */
+	putch('V');
+	putch('R');
+	putch(' ');
+	putch('I');
+	putch('S');
+	putch('P');
+}
+#endif
+
+/* SW_MAJOR and MINOR needs to be updated from time to time to avoid warning message from AVR Studio */
+/* never allow AVR Studio to do an update !!!! */
+#define HW_VER	 0x02
+#define SW_MAJOR 0x01
+#define SW_MINOR 0x10
+
+static inline void handle_programmerVER(void) {
+	uint8_t ch = pagebuffer[0];
+	if(ch==0x80) putch(HW_VER);		// Hardware version
+	else if(ch==0x81) putch(SW_MAJOR);	// Software major version
+	else if(ch==0x82) putch(SW_MINOR);	// Software minor version
+	else if(ch==0x98) putch(0x03);		// Unknown but seems to be required by avr studio 3.56
+	else putch(0x00);				// Covers various unnecessary responses we don't care about
+}
+
+static inline void handle_addr(void) {
+		address = *((uint16_t*) &pagebuffer[0]);
+		address = address << 1;	        // address * 2 -> byte location
+}
+
+static inline void handle_spi() {
+	if (pagebuffer[0] == 0x30) {
+		if (pagebuffer[2] == 0) {
+			putch(SIGNATURE_0);
+		} else if (pagebuffer[2] == 1) {
+			putch(SIGNATURE_1);
+		} else {
+			putch(SIGNATURE_2);
+		} 
+	} else {
+			putch(0x00);
+	}
+}
+
+#if defined (__AVR_ATmega644P__)
+// correct for a bug in avr-libc
+#undef SIGNATURE_2
+#define SIGNATURE_2 0x0A
+#endif
+
+static inline void handle_sig() {
+	putch(SIGNATURE_0);
+	putch(SIGNATURE_1);
+	putch(SIGNATURE_2);	
+}
+
+static inline void handle_write() {
+	uint8_t w;
+	if (flags.eeprom) {		                //Write to EEPROM one byte at a time
+		for(w=0;w<length.word;w++) {
+#if defined(__AVR_ATmega168__)  || defined(__AVR_ATmega328P__)
+			while(EECR & (1<<EEPE));
+			EEAR = (uint16_t)(void *)address;
+			EEDR = pagebuffer[w];
+			EECR |= (1<<EEMPE);
+			EECR |= (1<<EEPE);
+#else
+			eeprom_write_byte((void *)address,pagebuffer[w]);
+#endif
+			address++;
+		}
+	} else {					            //Write to FLASH one page at a time
+		write_flash_page();
+	}
+}
+
+static inline void handle_read() {
+	uint16_t w = 0;
+	for (w=0;w < length.word;w++) {		        // Can handle odd and even lengths okay
+		if (flags.eeprom) {	                        // Byte access EEPROM read
+#if defined(__AVR_ATmega168__)  || defined(__AVR_ATmega328P__)
+			while(EECR & (1<<EEPE));
+			EEAR = (uint16_t)(void *)address;
+			EECR |= (1<<EERE);
+			putch(EEDR);
+#else
+			putch(eeprom_read_byte((void *)address));
+#endif
+			address++;
+		} else {
+#if defined (__AVR_ATmega128__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1280__) || defined (__AVR_ATmega1284__)
+			if (address & 0xFFFF0000) putch(pgm_read_byte_far(address));
+			else putch(pgm_read_byte_near(address));
+#else
+			putch(pgm_read_byte_near(address));
+#endif
+			address++;
+		}
+	}
+}
+
+/* stk500v1 protocol ---------------------------------- */
+/* Added: returns 0 if no uart programmer, 1 if programmer detected*/
+
+uint8_t stk500v1() {
+	uint16_t w  = 0;
+	uint8_t ch = 0;
+	uint8_t firstok = 0;
+    
+    /* Used to know if a programmer was detected, to allow stk500v1 to return something useful on exit. */
+    uint8_t uart_programmer_detected = 0;
+
+	/* open serial port */
+	setup_uart();
+
+	/* forever loop */
+	for(;;) {
+
+		/* get character from UART */
+		ch = getch();
+
+		// handle errors and quit cmd...
+		if (ch == '0') firstok = 1;
+		if (ch == 0xFF) return;
+		if (firstok == 0 || ch == 'Q') break;
+
+		/* commands interpreter: check for cmd that need reply */
+		if (
+#ifndef MINIMALISTIC
+		    ch == '1' ||
+		    ch == 'R' ||
+		    ch == '@' ||
+
+#endif
+		    ch == 'A' ||
+		    ch == 'U' ||
+		    ch == 'V' ||
+		    ch == 'B' ||
+		    ch == 'E' ||
+		    ch == 'u' ||
+		    ch == 'd' ||
+		    ch == 't' ||
+		    ch == '0' ||
+		    ch == 'P')
+		{
+			/* command was found, determine length... */
+			uint16_t len = 0;
+
+			if (ch == 't' || ch == 'd') {
+				/* parse len */
+				/* length is big endian and is in bytes */
+				length.byte[1] = getch();
+				length.byte[0] = getch();
+
+				flags.eeprom = (getch() == 'E');
+				len = (ch == 'd') ? length.word : 0;
+			} else {
+				/* constant len */
+#ifndef MINIMALISTIC
+				if (ch == 'B') len = 20;
+				if (ch == 'E') len = 5;
+#endif
+				if (ch == 'V') len = 4;
+				if (ch == 'U') len = 2;
+				if (ch == 'A') len = 1;
+			}
+
+			// now consume the right amount of bytes
+			for (w=0; w < len; w++) pagebuffer[w] = getch();
+
+			// search Sync Token
+			while (getch() != ' ');
+
+			// send start of response
+			putch(0x14);
+
+
+			// handle response
+#ifndef MINIMALISTIC
+			if (ch == '1') handle_programmerID();
+#endif
+			if (ch == 'A') handle_programmerVER();
+			if (ch == 'U') handle_addr();
+			if (ch == 'V') handle_spi();
+			if (ch == 'u') handle_sig();
+			if (ch == 'd') handle_write();
+			if (ch == 't') handle_read();
+
+			// send end of response
+			putch(0x10);
+            
+            /* Now it's certain that a programmer was detected and used */ 
+            uart_programmer_detected = 1;
+		}
+
+	} /* forever loop */
+
+	/* make avrdude happy when issuing quit command */
+	putch(0x14);
+	putch(0x10);
+    
+    return uart_programmer_detected;
+}
diff --git a/stk500v1.h b/stk500v1.h
new file mode 100644
index 0000000..d1d3e72
--- /dev/null
+++ b/stk500v1.h
@@ -0,0 +1,36 @@
+/**********************************************************/
+/* stk500v1.h                                             */
+/* Copyright (c) 2010 by thomas seiler                    */ 
+/* Implementation of the AVR STK500v1 protocol            */
+/* Inspired by the original Arduino Bootloader code,      */
+/* But heavily rewritten for smaller code size            */
+/*                                                        */
+/* -------------------------------------------------------*/
+/*                                                        */
+/* This program is free software; you can redistribute it */
+/* and/or modify it under the terms of the GNU General    */
+/* Public License as published by the Free Software       */
+/* Foundation; either version 2 of the License, or        */
+/* (at your option) any later version.                    */
+/*                                                        */
+/* This program is distributed in the hope that it will   */
+/* be useful, but WITHOUT ANY WARRANTY; without even the  */
+/* implied warranty of MERCHANTABILITY or FITNESS FOR A   */
+/* PARTICULAR PURPOSE.  See the GNU General Public        */
+/* License for more details.                              */
+/*                                                        */
+/* You should have received a copy of the GNU General     */
+/* Public License along with this program; if not, write  */
+/* to the Free Software Foundation, Inc.,                 */
+/* 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
+/*                                                        */
+/* Licence can be viewed at                               */
+/* http://www.fsf.org/licenses/gpl.txt                    */
+/**********************************************************/
+
+#ifndef _stk500v1_h_
+#define _stk500v1_h_
+
+uint8_t stk500v1();
+
+#endif /* _stk500v1_h_ */