Compatibility Support Module - lersek/edk2 GitHub Wiki

The Compatibility Support Module (CSM) provides services that allow a UEFI based firmware to support a legacy PC boot process.

The 16-bit CSM component programming interface is described in this file:

• https://github.com/tianocore/edk2/raw/master/IntelFrameworkPkg/Include/Protocol/LegacyBios.h

The CSM specification document is available here:

• http://www.intel.com/technology/framework/spec.htm - download the CSM Specification V.098