Atmel kindly gave me an Xplain Xmega board at one of their Xmega seminars. It’s a useful tool for ATXmega development, but it does have a couple of problems. I thought I’d mention the ones I’ve tripped over, in case anybody else sees the same problems.
Board Doesn’t Restart Properly
I’ve found that when the AVRISP2 programmer [...]

This is a surprisingly common question.  When using WinAVR, how do you get printf() working on an Atmel Xmega processor?  Hopefully this post will help explain how.
First of all, this documentation page has some good information regarding the different flavours of WinAVR printf:
http://www.nongnu.org/avr-libc/user-manual/group__avr__stdio.html
Note the existence of the printf_P() function, which makes it easy to work [...]