I have build the Atmel 3.4.3 toolchain from here
On my RasPi , running raspbian not the "foundation kernel"
uname -a Linux raspi3 3.6-trunk-rpi #1 Debian 3.6.9-1~experimental.1+rpi7 armv6l GNU/Linux
The package is on Cliff's server (Thanx Cliff)
I have only compiled a single project , but it was succesfull.
Well a Kazillion warnings , seems like gcc 4.8.1 is more picky than my old 4.5.1.
Try it out if you like , and remember to get/read the .txt file also on the server.
Remember to remove the old 4.5.1 toolchain if you have that one installed.
Ohh btw: It took 18h50m to build the atmel-gcc , then came avrdude 6.1 , avarice 2.12 and avr-gdb 7.7 , but that was just 1h or so.