o add gnususb as reference bootloader

o refactor boot loader  cpde
o

tools/gnusb/firmware/Makefile

@@ -0,0 +1,68 @@
+# Name: Makefile
+# Project: gnusb
+# Author: Michael Egger me@anyma.ch
+#
+# Based on Makefile for Powerswitch
+# Author: Christian Starkjohann
+# Creation Date: 2004-12-29
+# Tabsize: 4
+# Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
+# License: Proprietary, free under certain conditions. See Documentation.
+# This Revision: $Id: Makefile 147 2006-03-01 17:33:03Z cs $
+# Target MCU: Atmel Atmega16-16
+
+#change DEVICE o the name of your gnusb (as defined in usbconfig.h)
+DEVICE = gnusb
+
+COMPILE = avr-gcc -Wall -Os -Iusbdrv -I. -mmcu=atmega16 #-DDEBUG_LEVEL=2
+# NEVER compile the final product with debugging! Any debug output will
+# distort timing so that the specs can't be met.
+
+OBJECTS = usbdrv/usbdrv.o usbdrv/usbdrvasm.o usbdrv/oddebug.o gnusb.o main.o
+# Note that we link usbdrv.o first! This is required for correct alignment of
+# driver-internal global variables!
+
+
+# symbolic targets:
+all:	main.hex
+
+.c.o:
+	$(COMPILE) -c $< -o $@
+
+.S.o:
+	$(COMPILE) -x assembler-with-cpp -c $< -o $@
+# "-x assembler-with-cpp" should not be necessary since this is the default
+# file type for the .S (with capital S) extension. However, upper case
+# characters are not always preserved on Windows. To ensure WinAVR
+# compatibility define the file type manually.
+
+.c.s:
+	$(COMPILE) -S $< -o $@
+
+clean:
+	rm -f main.hex main.lst main.obj main.cof main.list main.map main.eep.hex main.bin *.o usbdrv/*.o gnusb.o main.s usbdrv/oddebug.s usbdrv/usbdrv.s
+
+# file targets:
+main.bin:	$(OBJECTS)
+	$(COMPILE) -o main.bin $(OBJECTS)
+
+main.hex:	main.bin
+	rm -f main.hex main.eep.hex
+	avr-objcopy -j .text -j .data -O ihex main.bin main.hex
+
+
+disasm:	main.bin
+	avr-objdump -d main.bin
+
+cpp:
+	$(COMPILE) -E main.c
+
+## ---------------------------------------------------
+## wrapper for gnusboot bootloader functions
+boot:  	all
+	../../binaries/./gnusboot -enter -device $(DEVICE)
+	../../binaries/./gnusboot -upload main.hex
+
+run: 
+	../../binaries/./gnusboot -clear_flag
+	../../binaries/./gnusboot -leave