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Old 08-31-2011, 05:36 AM   #1
bigeagle
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Registered: Jun 2011
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Linux often failed to find soundcard during boot


Hy everybody!

I work with an embedded Linux, kernel 2.6.18.
The problem is that the sound card of the system is often not found.
The boot msg:
Code:
Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC).
ASoC version 0.13.1
MUX: initialized MCBSP
AIC3X Audio Codec 0.1
ALSA device list:
  No soundcards found.
Sometime is works good and I got:
Code:
Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC).
ASoC version 0.13.1
MUX: initialized MCBSP
AIC3X Audio Codec 0.1
asoc: aic3x <-> davinci-i2s mapping ok
ALSA device list:
  #0: DaVinci EVM (aic3x)
I set the boot log-level to 8 but got no further outputs.
Is their a possibility to "solve" this problem after the boot? To probe the aic3x driver and create the audio devices with a script or program?

Thanks a lot,
BigEagle
 
Old 09-01-2011, 04:38 AM   #2
business_kid
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can you modprobe the module before starting alsa?
 
Old 09-01-2011, 04:46 AM   #3
bigeagle
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The driver is not build as module. It's build in the kernel. Do you think it could help to build the driver as module?
 
Old 09-01-2011, 07:05 AM   #4
business_kid
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I would.

Then at least you could see what's going on. There are too many detection problems otherwise. I'll bet when it's not picked up, /dev/snd is emptier.
 
Old 09-29-2011, 03:11 AM   #5
bigeagle
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I recompiled my kernel with the codec as module. While booting alsa starts without finding a sound card. After that I load the driver via modprobe. It works. But there are no sound entries in /dev. I thought that udev will automatically make them after modprobe the driver.

What do I have to do to get the /dev entries? Manually create them?

Thanks,
bigeagle
 
Old 09-29-2011, 02:13 PM   #6
business_kid
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If you modprobe the module, and no sound devices appear, that's a problem. You should get some talk from it. Try

modprobe <your sound module>
dmesg |tail
 
  


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