Motorola Droid 4/PowerVR
This page attempts to document useful links or other info to get powervr to work on Droid 4 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.
According to Release Notes, the last SDK to support SGX540 is 4.04.00.04 (SGX core revision 1.2.0, gfx_dbg_es7.x / gfx_rel_es7.x folders).
Pandaboard (ES) might be a suitable test platform since it is very similar to the Droid 4, and there are/were Ubuntu releases for it:
https://wiki.ubuntu.com/ARM/OmapDesktopInstall https://wiki.ubuntu.com/ARM/OMAP https://launchpad.net/~tiomap-dev/+archive/ubuntu/omap-trunk - TI OMAP-related packages, including PowerVR drivers
Ubuntu kernel module mirror:
Way to use TI drivers with modern X modesetting driver + glamor? https://github.com/TexasInstruments/dri3wsegl ;
There also exists leaked Android SGX540 DDK source code for OMAP4 device by LG, which is not linked here, but is easy to find and could be used as last resort.