EC SOC Interface

EC Physical Interface

The interface by which the EC is physically wired to the SOC may vary depending on what interfaces are supported by the Silicon Vendor, EC manufacturer and OEM. It is recommended that a simple and low latency protocol is chosen such as eSPI, I3C, UART, memory.

EC Software Interface

There are several existing OS interfaces that exist today via ACPI and HID to manage thermal, battery, keyboard, touch etc. These existing structures need to keep working and any new interface must be created in such a way that it does not break existing interfaces. This document covers details on how to implement EC services in secure world and keep compatibility with non-secure EC OperationRegions. It is important to work towards a more robust solution that will handle routing, larger packets and security in a common way across OS’s and across SV architectures.