使用存储库模式与Entity Framework一起使用的自动映像？

Been busy creating a new app, basically i have my dataccess, service layer and presentation layer... All works great but i am using the entity classes that are returned by EF. Problem here is i pass these onto the presentation layer so i need to add the entity framework reference /dataccess to the presentation layer - NOT GOOD:Been busy creating a new app, basically i have