Comment Re:BeagleBone Fully Documented; Broadcom Proprieta (Score 5, Informative) 246
While TI documents most of the am3359 SOC it does not provide any documentation for the Imagination Technologies PowerVR GPU core which is proprietary.
To the OP, as far as I know there are no non-proprietary GPUs (more or less beefy) on any ARM SOC so good luck on finding one without binary blobs.