Support for these devices have been committed upstream in binutils and gcc. I have patches for binutils 2.19 and gcc 4.3.3. Support for these devices has NOT been added to avr-libc yet, mainly because there are no header files yet for these devices. It's on my todo list, but it is a low priority, mainly because these header files have to created by hand (AFAIK, there are no XML device files for these in AVR Studio which are needed for automatic generation of the header file).
If you, or anyone, are actively buying these devices and wish to use AVR GCC to write software for these devices, I can be persuaded to increase the priority level to get the header files done and support for avr-libc added.
Eric Weddington
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