3D Acceleration

Mali
There are two projects for open source Mali drivers.

The lima driver is for the Mali Utgard GPUs, specifically the Mali 400 (2008) and the Mali 450 (2012)

The panfrost drivers is for the Mali Midgard and Bifrost GPUs, except T604 and G71.

Mali T720 and older are limited to OpenGL 2.1 and OpenGL ES 2.0.

Mali T628 uses only 4 of 6 cores.

Tegra
The opensource reverse-engineered driver for Tegra GPUs is Grate (anagram of "tegra"). It seems to work with Tegra 2, 3 and 4 GPUs

The newer Tegra K1 and X1 use an 3D core that can be used with Nouveau instead with a seperate tegra display driver to handle the I/O

VideoCore
There are two projects for open source VideoCore drivers.

The vc4 driver is for Broadcom VideoCore IV GPUs.

The v3d driver is for Broadcom VideoCore V and VideoCore VI GPUs.

PowerVR
There is no FOSS driver for the PowerVR SGX5 series GPUs found on OMAP3 and OMAP4 TI SoCs.

However, the driver and blobs from TI do work work on the mainline kernel when built with the open parts of the TI drivers, and a patched Mesa is used. This work cannot be integrated into pmaports, but is maintained in a separate, pmos-compatible repository, https://gitlab.com/pvrports

A project aiming to reverse engineer these GPUs has been started, https://codeberg.org/Garnet/sgx540-reversing and is in its early stages yet.