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Intel® Platform Innovation Framework for UEFI—CSM Spec, Rev. 98OverviewThis 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 SpecificationRead the full Intel® Platform Innovation Framework for UEFI—CSM Spec, Rev. 98.