It would be better if you ask alsa mailing list these questions.

># alsa_amixer -c 0
># alsa_aplay -l
>shows my devices info correctly.

Check whether your device nodes are getting created or not.

It should be
/proc/asound/card0/pcm0P -Playback device
/proc/asound/card0/pcm0C -Capture device

If these device nodes are not getting created then you can't play
audio on your board.
First check this.

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