How shall unused GPIO pins on the A111 be used?

Unused GPIOs (GPIO0-GPIO4) should be grounded. They can be hard grounded, no need to ground them via resistors. These pins are grounded via resistors in the XC111 to allow maximum flexibility.

It should be noted that since version 1.0 of the A111 datasheet, GPIO0-GPIO4 have been changed to GND pins.