after I compiled alsa-lib and alsa-utils, I use aplay on real hard board and it 
shows:
  aplay
ALSA lib external/alsa-lib/src/confmisc.c:670:(snd_func_card_driver) cannot 
find card '0'
ALSA lib external/alsa-lib/src/conf.c:3500:(_snd_config_evaluate) function 
snd_func_card_driver returned error: No such devie
ALSA lib external/alsa-lib/src/confmisc.c:391:(snd_func_concat) error 
evaluating strings
ALSA lib external/alsa-lib/src/conf.c:3500:(_snd_config_evaluate) function 
snd_func_concat returned error: No such device
ALSA lib external/alsa-lib/src/confmisc.c:1070:(snd_func_refer) error 
evaluating name
ALSA lib external/alsa-lib/src/conf.c:3500:(_snd_config_evaluate) function 
snd_func_refer returned error: No such device
ALSA lib external/alsa-lib/src/conf.c:3968:(snd_config_expand) Evaluate error: 
No such device
ALSA lib external/alsa-lib/src/pcm/pcm.c:2143:(snd_pcm_open_noupdate) Unknown 
PCM default
aplay: main:555: audio open error: No such device


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