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Intel® Platform Innovation Framework, EFI Compatibility SupportOverviewThis 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 SpecificationScopeThis 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 designRationaleThere is always a transitional period between the introduction of a new technology and the technology that it replaces. The addition of compatibility support code to EFI bridges this transitional period. The compatibility support code allows booting a traditional OS or booting an EFI OS off a device that requires a traditional OpROM. Read the full Intel® Platform Innovation Framework, EFI Compatibility Support.