I want to enable full UART on BBB including Rx, Tx, RTS, CTS, DTR, DSR, RI and DCD to do full modem handshaking. I came to know that BBB has no support for DSR, DTR, RI and DCD. So, I have to use GPIO’s for these. So can anyone suggest me how to go about writing a hacked kernel object that could help me enable full UART.