I'm using Fedora Linux and I cannot find a compiler that lists the XMega A4U as a supported device.
I have not yet got a device (I expect to get one soon, hope to be able to use it).
I have installed avr-gcc-4.6.2 (from Fedora repositories). gcc-4.5.1 from Atmel download site (avr toolchain, usable with the Xmega 32A4). Now trying also GCC 4.7.0 pre-release.
EHMMM.... I think avr-libc-1.8.0 also lacks support for these devices (or possibly it did not compile because the compiler do not support them?).
Could I compile for A4 and use the binary on A4U (not using new hardware features?). Any foreseeable updates? (it looks like they are missing the GCC-4.7.0 release schedule).
From my point of view, Atmel ARE shooting themselves in the foot (and I'm not the first person to say it).
*TIA, -- Itai Nahshon