The FD, FV and Capsule sections (and nested sections) permit setting PCD default values. All PCDs must be declared in a DEC file in order to be used. It is recommended that the PCDs set in the FDF file be for Addresses, Sizes, and/or other "fixed" information needed to define or create the flash image. Use of PCDs is permitted in the FDF file. The Dynamic and DynamicEx PCDs can be accessed or modified during execution, as result, they cannot be set within the FDF file.