Copyright (c) 2011-2020, Arm Limited. All rights reserved.

[1] Power Control System Architecture - DEN0050C (Please contact Arm directly to obtain a copy of this document)

[2] System Control and Management Interface - DEN0056A

[3] Power Policy Unit - DEN0051C (Please contact Arm directly to obtain a copy of this document)

[4] System Guidance

There is a strong trend in the industry to provide microcontrollers in systems to abstract various power, or other system management tasks, away from Application Processors (APs). The Power Control System Architecture (PCSA) [1] describes how systems can be built following this approach.

The PCSA defines the concept of the System Control Processor (SCP), a dedicated processor that is used to abstract power and system management tasks away from application processors.

Similar to the SCP, the Manageability Control Processor (MCP) follows the same approach with the goal of providing a management entry-point to the System on Chip (SoC) where manageability is required, such as on a SoC targeting servers.

SCP-firmware provides a software reference implementation for the System Control Processor (SCP) and Manageability Control Processor (MCP) components found in several Arm Compute Sub-Systems.

• Initialization of the system to enable application core boot
• Runtime services:
  • Power domain management
  • System power management
  • Performance domain management (Dynamic voltage and frequency scaling)
  • Clock management
  • Sensor management
• System Control and Management Interface (SCMI, platform-side)
• Support for the GNU Arm Embedded and Arm Compiler 6 toolchains
• Support for platforms with several control processors

Various builds of the release have been tested on the following ARM Fixed Virtual Platforms (FVPs):

• System Guidance for Mobile platform SGM-775 (Version 11.3 Build 42)
• System Guidance for Infrastruture SGI-575 (Version 11.3 Build 42)
• Neoverse N1 reference design (Version 11.6 Build 45)
• System Guidance for Mobile platform SGM-776 (Version 11.6 Build 45)
• Juno reference design (Please contact Arm directly to obtain the Juno FVP)
• RD-N1-Edge Dual-Chip reference design (Please contact Arm directly to obtain the RdN1EdgeX2 FVP)
• RD-Daniel Config-M reference design (Please contact Arm directly to obtain the RdDaniel-CfgM FVP)

The software is provided under a BSD-3-Clause license.

See user_guide.md for instructions on how to get, install, build and use SCP-firmware on supported Arm platforms.

Arm welcomes any feedback on SCP-firmware. Please contact the maintainers (see maintainers.md).

To request support please contact Arm by email at [email protected]. Arm licensees may also contact Arm via their partner managers.