Raspberry Pi is dependent on non-free firmware blobs, see
https://www.fsf.org/campaigns/priority-projects/reverse-engineering
Its graphic card is part of it.
Also, if he's hoping to get something 100% free, he should use something else
than the raspberry pi, since it needs non-free software for booting. See :
https://www.fsf.org/resources/hw/single-board-computers
If he do not care for the blobs, he can use it.
Anyhow, I recommend using something else, like the ThinCan or the Beagleboard
(which also needs non-free blobs, for the GPU)
