RPMC Support Using eSPI OOB (eRPMC)

Architecture Specification

ID Date Version Classification
739180 06/01/2025 Public
Document Table of Contents
Document Table of Contents
Legal Revision History References Introduction eRPMC Implementation
Legal
Revision History
References
Introduction
eRPMC Implementation
eRPMC Implementation eRPMC - RPMC Commands as OOB over eSPI (Tunneled SMBus Messages – MCTP) Maximum Payload Size (MPS) SMB/MCTP Parameters RPMC Commands Reserved Command-type Monotonic Counters
eRPMC - RPMC Commands as OOB over eSPI (Tunneled SMBus Messages – MCTP)
eRPMC - RPMC Commands as OOB over eSPI (Tunneled SMBus Messages – MCTP) Format Used for RPMC OOB Commands
Format Used for RPMC OOB Commands
Maximum Payload Size (MPS)
SMB/MCTP Parameters
RPMC Commands
RPMC Commands Write Root Key Register Update HMAC Key Register Increment Monotonic Counter Request Monotonic Counter Read RPMC Parameters
Write Root Key Register
Update HMAC Key Register
Increment Monotonic Counter
Request Monotonic Counter
Read RPMC Parameters
Reserved Command-type
Monotonic Counters

References

  1. Intel Serial Flash Hardening Product External Architecture Specification (EAS) Revision 0.7. (Link)
  2. Intel Enhanced Serial Peripheral Interface (eSPI) Interface Base Specification (for Client and Server Platforms) January 2016 Revision 1.0. (Link)
  3. Intel Enhanced Serial Peripheral Interface (eSPI) Compatibility Specification For 2017, 2018, 2019, 2020 Client, Desktop and Server Platforms February 2019 Revision 0.7
  4. DMTF Management Component Transport Protocol (MCTP) Base Specification, DSP0236, Version: 1.3.1 (Link)
  5. DMTF Management Component Transport Protocol (MCTP) SMBus/I2C Transport Binding Specification, DSP0237, Version: 1.1.0 4 (Link)
  6. eRPMC enablement guide (search for “eRPMC enablement guide” at Link)
Introduction