The LinkIt 7697 board has some USB D+/- GPIO pins. What are these good for? Can they do USB Host? Given 7688 has USB Host, I hoped that the 7697 can do that, too.
Sorry, but found no word about these in the docs
There are no USB Host support for MT7697. The ISB_D+ and USB_D- pins are simply connected to the on-board micro-USB port, which connects to the CP2102N USB-to-UART converter. They are not pins from MT7697.