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General IO Port A?

Dear ALL,

	I try to use the GPIO Port A, but i have got some problems,
	Can you all give me some directions?
	First, I can't find where the GPIO A is located in the board.
	It seems that the COM2 Female is using GPIO A (4,5,6,7), so 
	if i use the GPIO A, then i need to disable the COM2 Debug Port??
	And where is the 0-3 pins?

	When i try to set the direction of the GPIO A using register 
	R_PORT_PA_DIR, then bool failure.
	the program line : *R_PORT_PA_DIR = 0x00; //ALL PINS AS INPUT
	in the module_init.