CS5530 Embedded System

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Can anybody suggest what I can try next?

I've built a snd_cs5530 module for an embedded system running a 
minimal 2.6.21.5 linux kernel.

I've run snddevices to create a /dev/snd subdirectory.

When I run aplay -l before loading the module I get 'no soundcard 
found' which is obviously correct.

However, after doing modprobe (which gives encouraging noises about 
finding my sound chip), aplay -l says 'Invalid CTL hw:0' and xmixer 
also talks about an Invalid CTL.

I've also tried to OSS emulation layer, sending stuff to /dev/dsp, but 
this just disappears silently.

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