GEN module

Hi,

I am developing software on ConnectME.
Regarding serial configuration,
I configure serial attribution using tcsetattr().
I read tcsetattr() source code.
When hardware flow control(handshake) is enabled,
Is it necessary to configure PORT configuration register by user application?
I think that tcsetattr() does not configure PORT configuration register.
I would like to use PORTA1 and A5 as input GPIO when hardware flow control is disabled.
User application has to configure PORT configuration register according to Serial channel register configuration?