Cut biscuits into small even pieces (about 9 per biscuit) and place in a bowl.
Sprinkle sugar, flour, cinnamon, and salt over the dough bites. Mix well.
On the grill, using a disposable foil pan or grill proof pan, combine blueberries, strawberries, blackberries, raspberries, sugar, and cornstarch. Stir well and let cook until fruit starts to release its juices.
Cover fruit with the cinnamon sugar-coated biscuit dough in as even a layer as possible.
Cover pan tightly with foil and close the grill. Keeping the temperature at 350˚F (175˚C) grill for 20 minutes.
Take the foil off pan and close grill again for 10 more minutes, or until dough is cooked through and golden brown. (Times and temperatures may vary based on grill).
Remove from the grill & serve with a scoop of ice cream.