Angstrom Linux is a lovely distro for ARM
so simple to set up....using the web page interface to build your distribution and the apps
you require.
It supports a multitude of platforms of hardware....lots
It suports about 60 boards (platforms)...
for example, many
Wondermedia SoC chips (wm8085) work by using the "mini2400" machine.
http://www.angstrom-distribution.org/The Pi Soc will possibly work. Although Pi already has about 20 operating systems working for it
Vince.