header file for register definition of AM335x

If you are asking about Linux, there is no single header that defines all AM335X registers.

Yes, i am asking Linux. Does TI have header files include UART and GPIO?? 

The UART registers can be found inside <linux_dir>/arch/arm/plat-omap/include/plat/serial.h.

Take a look at other .h files in the same folder, especially the am33xx.h file.

Best regards,
Miroslav

Thank you so much : )

Hi:

            i didn't see serial.h in the path you mentioned, i only saw something like "cpu.h", "i2c.h"...etc.

The information I posted is valid for kernel 3.2 from SDK v6. I assume you are using SDK v7 with kernel 3.12. Take a look at this file: linux-3.12.10-ti2013.12.01/arch/arm/mach-omap2/include/mach/serial.h

Best regards,
Miroslav

Yes, I found it as you said, does TI have any documents explain how to use the system call in the serial.c??

Thank you: )