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