red (pin 1, VBus) must be left open
white (pin 2, D-): TX
green (pin 3, D+): RX
black (pin 5): GND

# CONFIG_MSM_SERIAL_DEBUGGER is not set
console=ttyMSM0,115200n8
/dev/ttyMSM0

android-serialport-api
RXTX (and my patch neccessary at least for USB serial adaptors connected in USB host mode)