The compiler will automatically use all the available RAM banks on the
device you are programming. It is only if you wish to alter the default memory
allocation that you need take any action. Special bank() qualifiers
(see Bank Type Qualifier) and an option (see Addrqual Option) to indicate how these qualifiers are interpreted are
used to manually allocate variables.
Note that there is no guarantee that all the memory on a device can be utilized as data and code is packed in sections, or psects.