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CSM, Compatibility Support Module

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Unified Extensible Firmware Interface. Specification that defines a software interface between an operating system and platform firmware EFI's position in the software stack Intel developed the original Extensible Firmware Interface (EFI) specifications.

Unified Extensible Firmware Interface

Some of the EFI's practices and data formats mirror those of Microsoft Windows.[4][5] In 2005, UEFI deprecated EFI 1.10 (the final release of EFI). The Unified EFI Forum is the industry body that manages the UEFI specifications throughout. Boot - What is CSM option. Hyperlink.