Hi,
I just got my Galileo Gen 2.
1. Connect USB to serial cable RX - green to TX, TX - red to RX and Blue to GND at the UART1 , 6 pin FTDI next to 10/100 Ethernet
(P/N USB-SERIAL-CABLE-E-F)
2. Use PUTTY to the COM port identified by Win7. in my case COM28, Putty, baud rate 115200. logs in nicely to Yocto.