Orange PI

common:

• https://www.reddit.com/r/OrangePI/comments/4e9cgx/notes_for_ubuntu_orange_pi_pc_and_orange_pi_one/
• https://forum.armbian.com/index.php/topic/1420-opengl-on-mali-gpu-bananapi-orangepi-pc-etc/

video mali:

• https://archlinuxarm.org/forum/viewtopic.php?f=33&t=5979
• http://www.orangepi.org/orangepibbsen/forum.php?mod=viewthread&tid=53
• http://linux-sunxi.org/Mali_binary_driver

audio:

• https://forum.armbian.com/index.php/topic/1960-guide-configuring-orange-pi-pc-for-analog-line-out-jack-audio-output-and-simultaneous-hdmi-output-with-software-mixing/

speaker-test -D hw:0 -c2