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Xmega cdc bootloader support #4

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@jamuraa jamuraa commented Jul 22, 2013

I needed a USB CDC avr109 compatible bootloader, so I modified the CDC one in LUFA so that it works with at least the Xplain A3BU.

The normal function-type evaluation does not work on XMega,
gcc-avr compiles it into a "load and execute far pointer" combination.

jmp 0 is what Atmel uses in it's bootloader assembly, and should be equivalent
to the function pointer.
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