Motorola Droid 4/PowerVR
This page attempts to document useful links or other info to get powervr to work on droid4 with mainline kernel.
TI releases: http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/gfxsdk/ ; perhaps also this: http://git.ti.com/graphics/omap5-sgx-ddk-um-linux
Pandaboard (ES) might be a suitable test platform since it is very similar to the droid4, and there are/were Ubuntu releases for it:
Way to use TI drivers with modern X modesetting driver + glamor? https://github.com/TexasInstruments/dri3wsegl ;