Preheat oven to 425°. Cook noodles according to package directions; drain., In a large bowl, combine squash, oil and 1/2 teaspoon salt; toss to coat. Transfer to a 15x10x1-in. baking pan coated with cooking spray. Bake 10-15 minutes or until tender; remove from oven. Reduce heat to 375°., Place flour and remaining salt in a large saucepan; gradually whisk in milk. Bring to a boil, stirring constantly. Cook and stir 1-2 minutes or until thickened. Stir in garlic and rosemary., Spread 1 cup sauce into a 13x9-in. baking dish coated with cooking spray. Layer with three noodles, 1/3 cup cheese, a third of the squash and 1 cup sauce. Repeat layers twice. Sprinkle with remaining cheese., Cover and bake 40 minutes. Uncover; bake 10 minutes or until bubbly and top is lightly browned. Let stand 10 minutes before serving.