[alsa-devel] asoc: no valid backend routes for PCM: SDP4430 Media

[Liam Girdwood]

On 07/06/11 01:13, hong zhang wrote:
> List,
> 
> After capturing data from DMIC on OMAP4 blaze board with kernel 2.6.38 and save wav data to 38.wav.
> 
> But aplay complains "no valid backend routes". See following,
> 
> $aplay -f dat 38.wav 
> [  157.167724] asoc: no valid backend routes for PCM: SDP4430 Media
> aplay: main:654: audio open error: Invalid argument
> 

This means you have not configured an audio route for playback (i.e. the audio is not routed anywhere from pcm hw:0,0). Use alsamixer and configure the kcontrols to define the audio path. The kcontrol mappings to audio paths are detailed here for OMAP4 :-

http://omappedia.org/wiki/Audio_Drive_Arch

Liam