New images with up-to-date Volumio backend:
Volumio-3.547-2023-10-03-nanopineo2-armbian
Volumio-3.547-2023-10-03-nanopiair-armbian
Volumio-3.547-2023-10-03-nanopineo-armbian
And new image for NanoPi Neo3 with support SPDIF, I2S without/with external master-clock:
Volumio-3.547-2023-10-03-nanopineo3-armbian
If you want try I2S with external master-clock signal, you can edit armbianEnv.txt and set user_overlays like this:
user_overlays=rockchip-spdif-out-enable rockchip-i2s-external-mclk
By default, external clocks frequencies set to 11,2896M and 12,288M, but you can change it in rockchip-i2s-external-mclk.dts and recompile DTS. Pin GPIO2_A2 used for switching clocks 11,2896M/12,288M, but also may be changed by DTS. Pin I2S_MCLK is master clock input and can’t be changed to other pin.