News taken from GBAdev.org:

Frederic has released a demo of his LOFT system:This is a little prey-predator system. The originality is that it is programmed in a language called LOFT which allows for concurrent programming (with a variant of threads, called FairThreads). The objective of LOFT is to ease the programming of behavioral aspects in embedded systems such as the gba.

A Web page describes the context:
http://www.inria.fr/mimosa/rp/LOFT

The LOFT compiler can be obtained from there (GNU license).

http://www.gbadev.org/