The Platform Initialization Specification (PI Specification) is a specification published by the Unified EFI Forum that describes the internal interfaces between different parts of computer platform firmware[1]. This allows for more interoperability between firmware components from different sources. This specification is normally, but not by requirement, used in conjunction with the UEFI specification.
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UEFI Platform Initialization Specification version 1.2, published May, 2009. Errata B published July, 2010.
As of version 1.2, the PI specification contains five volumes: