I compiled full-armbian image for nanopi air.   root@nanopiair:~# uname -a Linux nanopiair 4.19.25-sunxi #5.76 SMP Wed Feb 27 13:46:35 KST 2019 armv7l GNU/Linux   and by armbian-config, on armbianEnv.txt overlays=spdif-out   root@nanopiair:~# aplay -l **** List of PLAYBACK Hardware Devices **** card 0: SPDIF [On-board SPDIF], device 0: spdif-dit-hifi dit-hifi-0 []   Subdevices: 1/1   Subdevice #0: subdevice #0   root@nanopiair:~# speaker-