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Intel® Platform Innovation Framework for EFI—CSM Spec, Rev. 97

Intel® Platform Innovation Framework for EFI: CSM Spec

Overview

This specification describes the high-level design of the Compatibility Support Module (CSM) code that is required for an implementation of the Intel® Platform Innovation Framework for EFI (hereafter referred to as the "Framework"). The CSM provides compatibility support between the Framework and traditional, legacy BIOS code and allows booting a traditional OS or booting an EFI OS off a device that requires a traditional option ROM (OpROM). This specification does the following:
• Describes the basic components of the CSM
• Defines how to use traditional BIOS option ROMs (OpROMs) to boot an EFI operating system (OS)
• Defines how to boot a traditional OS
• Provides code definitions for compatibility-related services, protocols, functions, and type definitions that are architecturally required by the Intel® Platform Innovation Framework for EFI Architecture Specification

Scope

This document describes the high-level design of the Compatibility Support Module (CSM) code developed for the Intel® Platform Innovation Framework for EFI (hereafter referred to as "the Framework"). This document will define how to do the following:
• Use traditional BIOS option ROMs (OpROMs) to boot an EFI Operating System (OS)
• How to boot a traditional OS This document’s primary focus is how to bind EFI and compatibility support code together. It does not define internal details of the CSM design

Read the full Intel® Platform Innovation Framework for EFI CSM Specification.