o add gnususb as reference bootloader

o refactor boot loader  cpde
o

tools/gnusb/bootloader/firmware/Makefile

@@ -0,0 +1,90 @@
+# Snesram
+# 2009-05-06 davdi@optixx.org
+#
+#
+# based on
+# Project snesram_bootloader
+# 2007-01-07 me@anyma.ch
+#
+# based on
+# Makefile for AVRUSBBoot
+# Modified by: Thomas Fischl
+# Modified: 2006-06-25
+
+# Original file by: 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 $
+
+BOOTLOADER_ADDRESS = 3800
+
+LDFLAGS += -Wl,--section-start=.text=$(BOOTLOADER_ADDRESS)
+
+UISP = uisp -dprog=stk500 -dserial=`echo /dev/tty.[Uu][Ss]*` -dpart=atmega16
+
+# The two lines above are for "uisp" and the AVR910 serial programmer connected
+# to a Keyspan USB to serial converter to a Mac running Mac OS X.
+# Choose your favorite programmer and interface.
+
+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 snesram_bootloader.o
+# Note that we link usbdrv.o first! This is required for correct alignment of
+# driver-internal global variables!
+
+
+# symbolic targets:
+all:	snesram_bootloader.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 $@
+
+flash:	all
+	$(UISP) --erase --upload --verify if=snesram_bootloader.hex
+#	$(UISP) --erase --upload  if=snesram_bootloader.hex
+
+fuse:
+	$(UISP) --wr_fuse_h=0xc8
+	$(UISP) --wr_fuse_l=0xef
+	
+avrdude: 
+	avrdude -c avr910 -p atmega8 -U flash:w:snesram_bootloader.hex
+
+
+clean:
+	rm -f snesram_bootloader.hex snesram_bootloader.lst snesram_bootloader.obj snesram_bootloader.cof snesram_bootloader.list snesram_bootloader.map snesram_bootloader.eep.hex snesram_bootloader.bin *.o usbdrv/*.o snesram_bootloader.s usbdrv/oddebug.s usbdrv/usbdrv.s
+
+# file targets:
+snesram_bootloader.bin:	$(OBJECTS)
+	$(COMPILE) -o snesram_bootloader.bin $(OBJECTS) $(LDFLAGS)
+
+snesram_bootloader.hex:	snesram_bootloader.bin
+	rm -f snesram_bootloader.hex snesram_bootloader.eep.hex
+	avr-objcopy -j .text -j .data -O ihex snesram_bootloader.bin snesram_bootloader.hex
+	./checksize snesram_bootloader.bin
+# do the checksize script as our last action to allow successful compilation
+# on Windows with WinAVR where the Unix commands will fail.
+
+disasm:	snesram_bootloader.bin
+	avr-objdump -d snesram_bootloader.bin
+
+cpp:
+	$(COMPILE) -E snesram_bootloader.c
+	
+download:
+	$(UISP) --download