DCMI Host Interface: Specification
The document includes a specification of the Intel-based DCMI host interface (DCMI-HI). The specification defines the DCMI-HI as a logical interface that enables the PC BIOS and host software agents to transfer DCMI requests and responses with a management controller over a host embedded controller interface. The DCMI-HI also can be used by BIOS prior to transferring control to the operating system.
Read the full DCMI Host Interface Specification.