In large bowl, mix 2 cups of the flour, the sugar, salt, baking soda and yeast. Add warm buttermilk and warm water; beat with spoon until well blended. Stir in remaining 1 3/4 cups flour to form a stiff batter. Stir in berries. Spread in pan. Cover loosely, and let rise in warm place about 1 hour or until batter is doubled in size.