# PDR Implementation

While PLDM Platform Descriptor Records (PDRs) are mostly static information,
they can vary across platforms and systems. For this reason, platform specific
PDR information is encoded in platform specific JSON files. JSON files must be
named based on the PDR type number. For example a state effecter PDR JSON file
will be named 11.json. The JSON files may also include information to enable
additional processing (apart from PDR creation) for specific PDR types, for eg
mapping an effecter id to a D-Bus object.

The PLDM responder implementation finds and parses PDR JSON files to create the
PDR repository. Platform specific PDR modifications would likely just result in
JSON updates. New PDR type support would require JSON updates as well as PDR
generation code. The PDR generator is a map of PDR Type -> C++ lambda to create
PDR entries for that type based on the JSON, and to update the central PDR repo.