1. find ground (like that on the USB port)
2. look for traces coming from the SoC via just one resistor (10K?) and linked to ground: these are most likely unused GPIOs
3. put your multimeter between gnd and the resister (try both sides)
4. try this until you get a reading (change):
(this is for GPIO0)
echo 0 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio0/direction
echo 0 > /sys/devices/virtual/gpio/gpio0/value
echo 1 > /sys/devices/virtual/gpio/gpio0/value
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