linux on AT91RM9200DK evaluation board from Atmel

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i am new to embedded linux.

currently working with linux on AT91RM9200DK evaluation board from
I am facing some problem in using available device driver like that of
RTC,serial port,Pio


My question is:
How can i know about the  functions  offered by a particular driver?
For example, consider serial port, here I have following drivers
routine available:


many other routines are also there in char directory.
I am unable to undersatnd which routine has to be called first?

at91_serial.c  OR  char/serial.c   ???

I tried to google about the problem but could not find much. Can
someone suggest me a

suitable link,thread or books where i can find some info about these

thanx in advance

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