Server and Infrastructure

Arm SystemReady SR (formerly ServerReady)

Arm has recently launched the Arm SystemReady Program which builds on and extends the Arm ServerReady Program to a broader set of devices in the embedded-server and high-performance IoT ecosystems. Arm SystemReady incorporates different market segments that target different sets of operating systems and hypervisors with different hardware and firmware requirements.

The term band is used to identify these differences with a short-hand notation for each band – SystemReady SR (formerly Arm ServerReady), SystemReady LS (LinuxBoot ServerReady), SystemReady ES (Embedded ServerReady) and SystemReady IR (IoT Ready).

The launch of these new bands means the name Arm ServerReady will be superseded by the name SystemReady SR for future certifications. This name change does not invalidate existing Arm ServerReady 1.0 certifications, however all partners and devices being certified for SystemReady SR version 2.0 will be part of this new program.

Arm SystemReady SR (formerly Arm ServerReady) provides a solution for servers that Just Works, allowing partners to deploy Arm servers with confidence. The program is based on industry standards and the Server Base System Architecture (SBSA) and Server Base Boot Requirement (SBBR) supplements, alongside the Arm Server Architectural Compliance Suite (ACS). Arm SystemReady SR ensures that Arm-based servers work out of the box, offering seamless interoperability with standard operating systems, hypervisors, and software.

Partners can run the ACS test suite that enables them to check that their systems are SystemReady SR. Compliant systems that adhere to the SystemReady Terms and Conditions will be issued with a compliance certificate.

Not all servers must support standard operating systems, for example some cloud service providers only support their own Linux operating systems. However, a server that is compliant with SystemReady SR (formerly Arm ServerReady), Just Works with the standard operating systems and hypervisors.

Find out more about the Arm SystemReady Program.

Arm Advisory Committee

The Arm ecosystem collaborates on the creation of standards for server through the Arm Advisory Committee. This group contains companies across the server ecosystem including OS, cloud, BIOS, independent software, and IP vendors as well as OEMs and ODMs. The committee communicates in various ways including mail, regular meetings and biannual gatherings.


Server Base System Architecture

Arm architecture covers a wide range of products, across many market segments, from embedded control, to mobile, to servers. Base System Architectures (BSA) provide hardware requirements for a given type of product or market segment. The requirements are intended to ensure standard software, or operating systems, will operate correctly on machines compliant with the BSA.

The Server Base System Architecture (SBSA) is the BSA for servers. The specification is developed in conjunction with partners across the industry:

  • OS vendors.
  • Hypervisor, Silicon and BIOS vendors.
  • IHVs, OEMs and ODMs.

The latest version of the SBSA specification includes:

  • Addition of SBSA Level-6 functionality.
  • Armv8.5 Processing Element Architecture (PE) requirements.
  • Enhanced PCIe device enumeration requirements.
  • Presenting on-chip peripherals as PCIe endpoint devices

Discover SBSA


Server Base Boot Requirements

Operating systems running on standard server hardware require standard firmware interfaces to be present in order to boot and function correctly. The Server Base Board Boot Requirements (SBBR) document describes these firmware requirements.

The SBBR covers UEFI, ACPI and SMBIOS industry standards as well as standards specific to Arm, such as PSCI.

Together with SBSA, the SBBR provides a standard based approach to building Arm servers and their firmware. The specification is developed in conjunctions with partners across the industry:

  • OS vendors.
  • Hypervisor, Silicon and BIOS vendors.
  • IHVs, OEMs and ODMs.

The latest version of the SBBR specification includes:

  • EFI System Resource Table (ESRT) clarification.
  • Portable Executable (PE) and Common Object File Format (CoFF) image guidance.
  • Advanced Configuration and Power Interface (ACPI) Processor Properties Topology Table (PPTT) is made mandatory.

Discover SBBR   


Server Base Security Guide

The Server Base Security Guide (SBSG) specification provides requirements and guidance that support maintenance of the integrity of the platform layer of an SBSA-SBBR based server, and support securely attesting to the platform’s state of integrity.

The scope of the guidance in this document is focused on protecting key assets in the platform, such as mutable firmware components, critical memory, and secure memory.

Download SBSG


The Server Base Manageability Requirements

The Server Base Manageability Requirements (SBMR) Specification establishes a common foundation for server management. This is achieved through standardizing common capabilities while allowing differentiation – valuable to the end-user – to be built on top. The requirements leverage the existing industry standard specifications for system management, such as Redfish, Platform Level Data Model (PLDM) and Management Component Transport Protocol (MCTP).

Download SBMR

Compliance test suite diagram.

Architectural Compliance Suites

Arm provides test suites for SBSA/SBBR covering:

  • SBSA hardware requirements (CPU, interrupts, IOMMU, PCIe,…) properties
  • SBBR defined FW requirements (UEFI, ACPI and SMBIOS tests)

The test suites are hosted in GitHub and are open source (Apachev2):

Explore Arm Enterprise ACS   Explore Arm SBSA ACS


Native AArch64 Binary Format UEFI Drivers

Starting from v1.1, SBBR requires the native AArch64 binary format to be used for UEFI Drivers. Find out more:

UEFI drivers