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+Arduino Uno and Mega 2560 Firmwares for the ATmega8U2
+
+This directory contains the firmwares used on the ATmega8U2 on the Arduino
+Uno and Arduino Mega 2560.  The arduino-usbdfu directory contains the DFU
+bootloader on the 8U2; the arduino-usbserial directory contains the actual
+usb to serial firmware.  Both should be compiled against LUFA 100807.  The
+two .hex files in this directory combine the dfu and serial firmwares into
+a single file to burn onto the 8U2.  
+
+To burn (Uno):
+avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:UNO-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m
+
+To burn (Mega 2560):
+avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:MEGA-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m
+
+
+Note on USB Vendor IDs (VID) and Product IDs (PID): The arduino-usbdfu
+project uses Atmel's VID and MCU-specific PIDs to maintain compatibility
+with their FLIP software.  The source code to the arduino-usbserial
+project includes Atmel's VID and a PID donated by them to LUFA.  This
+PID is used in LUFA's USBtoSerial project, which forms the basis for
+arduino-usbserial.  According to the LUFA documentation, this VID/PID
+combination is:
+
+ "For use in testing of LUFA powered devices during development only,
+ by non-commercial entities. All devices must accept collisions on this
+ VID/PID range (from other in-development LUFA devices) to be resolved
+ by using a unique release number in the Device Descriptor. No devices
+ using this VID/PID combination may be released to the general public."
+
+The production version of the arduino-usbserial firmware uses the
+Arduino VID.  This is only for use with official Arduino hardware and
+should not be used on other products.
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