Rockchip RK3399 boards

Graphics hardware acceleration (3D and VideoEngine)

Both only work with legacy (4.4.y) kernel using Buster userspace.
Check https://forum.armbian.com/topic/16516-rk3399-legacy-multimedia-framework/

3D acceleration in mainline is still in the works and is covered by Panfrost. There are still other issues like “unusual” screen resolutions like 1920x1200 are neither properly detected nor supported while classic FullHD 1920x1080 is fine.

USB-C

Partially works in legacy (4.4.y). Does not work with mainline due to lack of drivers.

Overclock overlay

The RK3399 can be overclocked at own risk. Use rockchip-rk3399-opp-2ghz.dtbo this.

Rockchip RK3328 / RK 3288

A similar multimedia framework is available if using legacy 4.4.y kernel on Buster userspace.
Check https://forum.armbian.com/topic/16517-rk3288rk3328-legacy-multimedia-framework/