Combine the cereals and nuts in a large roasting pan; set aside. In a large saucepan, combine the brown sugar, butter, corn syrup, cinnamon and salt; bring to a boil over medium heat, stirring occasionally. Boil and stir for 3 minutes.
Pour over cereal mixture and stir to coat. Bake at 250° for 1 hour, stirring every 15 minutes. Spread onto waxed paper. When cool, break apart and store in an airtight container.