HI! IT IS ACTUALLY HARD SINCE.... okay now it is better :D As I was saying,
It is actually hard since there is no linux-libre kernel for ARM Device, this
need to be created, but no one will create one on an ARM machine that needs
non-free drivers of firmwares in order to work.
So, if you have time and skills, you can find a Ubuntu version working on
that machine and after that just try to compile a libre kernel for ARM (hard
work indeed !).
So to simplify that. If you don't know how to do it, and the device needs
non-free software to work, then you are out of luck (this is why I don't buy
a Raspberry Pi yet, even if I can do the work of porting Trisquel to it, it
won't serve much because even I won't use it xD).