How to input/output sound/audio using MontaVista Linux on ML403

hi all,
 
I am a fresh guy here, this is my first time sending mails, thanks to all in advance.
 
I got MontaVista Linux run on Xilinx ML403(Powerpc 405, Virtex-4).
after that,
I am going to input/output sound upon MontaVista Linux, but I found that default kernel seems no support for audio.
can anyboy tell me something about how to build a kernel which could be run on ML403 with audio support.
 
thanks so much
HUANG Xu 
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