[Alsa-user] [help] alsa conf in LFS on special platform

[ming q. <bru...@gm...>]

Recently, I build lfs on Unicore32 platform( we develop our cpu and
everything on our soc, the platform is called Unicore32 ).
the system = tftpboot + nfs.
I have done several things as follows:
1. recompile the kernel with the alsa driver. ( linux 2.6.17 )(
alsa-1.0.11rc4)
2. cross compile alsa-lib-1.0.14
3. copy the asoundrc.txt in the alsa-lib package to ~/.asoundrc
4. mknod /dev/snd/pcmC0D0p c 116 16
    mknod /dev/snd/controlC0 c 116 0
    mknod /dev/snd/hwC0D0 c 116 4


and I write a very simple application,
when run it (as root),  some error appeal.

snd_pcm_open_noupdate()   pcm.c 2144 :  Unknown PCM HW:0,0

 I am  confused that if I have done the right things? I have done the above
4 steps . Have I miss some other steps ?

Thank you very much.


Maybe this problem is very stupid , But I am really confused about it .

Bruce Qian





some information :

/proc/asound/cadrs
 0 [CS4281         ]: CS4281 - Cirrus Logic CS4281
     Cirrus Logic CS4281 at 0x90840000, irq 6

/proc/asound/devices
  0: [ 0]   : control
  4: [ 0- 0]: hardware dependent
  8: [ 0- 0]: raw midi
 16: [ 0- 0]: digital audio playback
 24: [ 0- 0]: digital audio capture
 33:        : timer



/proc/asound/pcm
00-00: CS4281 : CS4281 : playback 1 : capture 1