Preheat the oven to 375 F. Butter a baking dish.
In a large bowl add apples, berries, brown sugar, cinnamon, salt and toss to blend. Pour apple-berry mixture into the prepared dish.
In a medium-sized bowl combine flour, salt, brown sugar and cinnamon. With pastry blender or two knives, cut in the butter until it's crumbly. Stir in the oats.
Sprinkle the oat mixture over the apples and bake 40 to 45 minutes or until apples are tender and topping is crisp and golden.