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CSM, Compatibility Support Module

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Unified Extensible Firmware Interface. Extensible Firmware Interface's position in the software stack.

Unified Extensible Firmware Interface

Intel developed the original EFI (Extensible Firmware Interface) specification. Some of the EFI's practices and data formats mirror those from Microsoft Windows.[5][6] In 2005, UEFI deprecated EFI 1.10 (the final release of EFI). The Unified EFI Forum is the industry body that manages the UEFI specification. History[edit] Boot - What is CSM option. Hyperlink.