The specifications of the interfaces that hold the platform together and that derivatives build against: on-chip bus and subsystem interfaces, hardware to software interfaces, and the external interfaces reference boards expose.
Specification Work product in the Platform and derivative products lifecycle
Reuse works only when interfaces stay stable across releases and derivatives. These specifications fix what IP, software and boards can rely on, and their compatibility policy tells everyone which changes break existing derivatives and which do not.
The full lifecycle detail, with its charts, flows, tables and every section, is for registered members. Registration is free and takes a minute. You come back to this page afterwards.