Optimus Black (P970) serial¶

The Optimus Black (P970) allows accessing an UART serial port through the USB connector. A MAX14526 MUIC is in charge of switching between the USB and UART lines. The UART line can be muxed either to the main processor's debug UART (UART3), to the modem's UART or to the modem's USB lines via a FSUSB63 DP3T switch.

Thus, a working configuration to access the serial port through the USB connector is to route the USB connector to the UART line with the MAX14526 MUIC and to route the UART line to the main processor's debug UART (UART3) with the FSUSB63 DP3T switch.