Searching the internet I found how to make Alsa nodes:
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mkdir /dev/snd mknod -m 666 /dev/snd/controlC0 c 116 0 mknod -m 666 /dev/snd/hwC0D0 c 116 4 mknod -m 666 /dev/snd/hwC0D1 c 116 5 mknod -m 666 /dev/snd/hwC0D2 c 116 6 mknod -m 666 /dev/snd/hwC0D3 c 116 7 mknod -m 666 /dev/snd/midiC0D0 c 116 8 mknod -m 666 /dev/snd/midiC0D1 c 116 9 mknod -m 666 /dev/snd/midiC0D2 c 116 10 mknod -m 666 /dev/snd/midiC0D3 c 116 11 mknod -m 666 /dev/snd/midiC0D4 c 116 12 mknod -m 666 /dev/snd/midiC0D5 c 116 13 mknod -m 666 /dev/snd/midiC0D6 c 116 14 mknod -m 666 /dev/snd/midiC0D7 c 116 15 mknod -m 666 /dev/snd/pcmC0D0c c 116 24 mknod -m 666 /dev/snd/pcmC0D0p c 116 16 mknod -m 666 /dev/snd/pcmC0D1c c 116 25 mknod -m 666 /dev/snd/pcmC0D1p c 116 17 mknod -m 666 /dev/snd/pcmC0D2c c 116 26 mknod -m 666 /dev/snd/pcmC0D2p c 116 18
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mknod -m 660 /dev/mixer c 14 0; chgrp audio /dev/mixer mknod -m 660 /dev/mixer1 c 14 16; chgrp audio /dev/mixer1 mknod -m 660 /dev/dsp c 14 3; chgrp audio /dev/dsp mknod -m 660 /dev/dsp1 c 14 19; chgrp audio /dev/dsp1
I tried two diffent el-cheapo usb cards, a Speed-link SL-8850, and a unbranded 'skype-phone'.
I suppose ZyXEL didn't port the modules they don't use, and that the source is not fully Marvell compatible. The vanilla kernel seems to support Marvell now, so maybe I can just compile one of it's modules in the ZyXEL environment.
Questions: Is it possible that a 'vanilla module' will work in my system? (compiled with ZyXEL's kernel headers and toolchain), and if yes, which module would be the problem? Facing my investigation I suppose the problem rises when mpd closes the device (/dev/dsp or /dev/snd/pcmX?), but I don't see the link between the modules and the nodes.
Is there a way to find out why and in which module the kernel crashes?
Extra information: uname -a gives Linux NSA220 126.96.36.199 #1 Fri Nov 9 18:46:49 CST 2007 armv5tejl GNU/Linux
When using oss the cpu load is 8% for mpd, when using alsa it's 50%. I suppose the difference is causes by a virtual mixer which is not optimized for a FPU less system?