> I am have written a driver for my sound card
> 
> 1. If I palce the driver in SDCard and launch the IO-Audio with -d option to 
> specify driver path it does not use this driver instead it uses default driver
>  present in other folder.
> 2. If I place the driver in tmp folder & launch the IO-Audio with -d option to
>  specify driver path it uses this driver.
> 
> I would like to know why option 1 does not work ...


One more query is,
I am writing a driver that actually doesnot need DMA. Is it mandatory to have DMA in our drivers only then IO-Audio will
 work ?