Preheat oven to 375 degrees F.
In an oven-safe 12-inch skillet, mix together berries, 2 tablespoons maple sugar, zest, juice, and cornstarch.
In a bowl, mix together flour, cornmeal, salt, and remaining 2 tablespoons sugar. Using your hands, add butter and mash with dry ingredients until no dry spots remain and mixture holds together if squeezed. Add corn and mix to distribute evenly. Press topping between fingers and place pieces over skillet with berries.
Bake until golden brown and bubbling, approximately 45 minutes. Allow to cool at least 15 minutes before serving.