Quick notes on testing audio on the i.MX 8QuadMax MEK board with 4.19.35-1.1.0 BSP. Hardware: - Connect the MCIMX8QM-CPU to the MCIMX8-8X-BB. - Connect the IMX-AUD-IO to the Audio Slot 1 on the MCIMX8-8X-BB. - Short 2 and 3 on J47 on the MCIMX8-8X-BB - Connect an external powered speaker to RCA connectors Audio OUT FR and/or Audio OUT FL on the IMX-AUD-IO - Optionally, connect a headphone on J15 on the MCIMX8QM-CPU Test: Power on the board. aplay -l shows the audio interface available. root@imx8qmmek:~# aplay -l **** List of PLAYBACK Hardware Devices **** card 0: cs42888audio [cs42888-audio], device 0: HiFi cs42888-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: cs42888audio [cs42888-audio], device 1: HiFi-ASRC-FE (*) [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: wm8960audio [wm8960-audio], device 0: HiFi wm8960-hifi-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: imxaudmix [imx-audmix], device 0: HiFi-AUDMIX-FE (*) [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: imxaudmix [imx-audmix], device 1: HiFi-AUDMIX-FE (*) [] Subdevices: 1/1 Subdevice #0: subdevice #0 Play file on powered speaker via cs42888: root@imx8qmmek:~# aplay -Dhw:0,0 test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo Play file on headphone via wm8960: root@imx8qmmek:~# aplay -Dhw:1,0 test.wav
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