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

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

$ uname -a Linux ubuntu 2.6.38.4+ #58 SMP PREEMPT Fri Jun 3 09:44:19 PDT 2011 armv7l GNU/Linux

Does ALSA add new functionality of backend?

Thanks.

---henry