I am trying to get i2s audio data out of the Low Speed Expansion Connector and would very much appreciate some guidance. I am using the dragonboard410c_sdcard_install_debian-66 and have also tried build 69 with the same results. Page 15 of the hardware manual suggests that I should get a signal on pins 16, 18 and 20 but I cannot get this to work. Generally the audio is working but I am guessing there is a little more I need to do than flipping from HDMI to HiFi Quality in the pulse audio configuration tab!
Any help would be greatly valued; I am new to Linux so it could well be that I have overlooked some obvious thing. I am thinking pinmux, devicetree… but shouldn’t this “just work” out of the box?