pandaboard audio system

[gaober]

hi!
i want to implenment the audio system for pandaboard.there are some questions.
i find directory /os/src/drivers/audio_out/linux,do i need it?
shold i implenment the audio system by using dde method?or should i write audio driver in addition?Maybe the twl6040 driver?
do you have some suggestions,please?
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