March 30, 20242 yr I have Armbian up and running on a Rock Pi S with a PoE HAT. To enable the audio jack on the PoE HAT I had to run the following commands as mentioned on the official Rock Pi S PoE Hat wiki. # echo 15 > /sys/class/gpio/export # echo out > /sys/class/gpio/gpio15/direction # echo 1 > /sys/class/gpio/gpio15/value Once enabled, the audio works as needed. However, every time the device is rebooted I have to SSH in and run these commands again to re-enable audio out which is obviously not ideal. How can I persist these changes between reboots?
April 1, 20242 yr Author Solution I was able to solve this by using systemd-tmpfiles to modify these values on boot. Specifically I created a file `/etc/tmpfiles.d/enable-audio-jack.conf` with the following contents. w /sys/class/gpio/export - - - - 15 w /sys/class/gpio/gpio15/direction - - - - out w /sys/class/gpio/gpio15/value - - - - 1
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