# Server Base System Architecture > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Server_Base_System_Architecture > Markdown URL: https://mediated.wiki/source/Server_Base_System_Architecture.md > Source: https://en.wikipedia.org/wiki/Server_Base_System_Architecture > Source revision: 1304464469 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) The '''Server Base System Architecture''' ('''SBSA''') is a hardware system architecture for [server](/source/server_(computing))s based on 64-bit [ARM](/source/ARM_architecture) processors.{{cite news |author=Peter Bright |date=30 January 2014 |title=ARM finally defines a platform as it sets its sights on the server room |publisher=[Ars Technica](/source/Ars_Technica) |url=https://arstechnica.com/information-technology/2014/01/arm-finally-defines-a-platform-as-it-sets-its-sights-on-the-server-room/ }}{{cite news |author=Johan De Gelas |date=29 January 2014 |title=ARM and Partners Deliver First ARM Server Platform Standard |publisher=[AnandTech](/source/AnandTech) |url=http://www.anandtech.com/show/7721/arm-and-partners-deliver-first-arm-server-platform-standard |archive-url=https://web.archive.org/web/20140131074619/http://anandtech.com/show/7721/arm-and-partners-deliver-first-arm-server-platform-standard |url-status=dead |archive-date=January 31, 2014 }}{{cite press release |title=ARM Ecosystem Collaborates to Deliver Initial Server Platform Standard |date=29 January 2014 |publisher=[ARM Holdings](/source/ARM_Holdings) |url=http://www.arm.com/about/newsroom/arm-ecosystem-collaborates-to-deliver-initial-server-platform-standard.php }}{{cite news |author=Jonathan Corbet |date=5 February 2014 |title=ARM, SBSA, UEFI, and ACPI |publisher=[LWN.net](/source/LWN.net) |url=https://lwn.net/Articles/584123/ }} == Rationale == Historically, ARM-based products have often been tailored for specific applications and power profiles. Variation between ARM-based hardware platforms has been an impediment requiring operating system adjustments for each product. The SBSA seeks to strengthen the ARM ecosystem by specifying a minimal set of standardized features so that an [OS](/source/Operating_system) built for this standard platform should function correctly without modification on all hardware products compliant with the specification. == Features == * CPU features * Memory management * Peripheral access * Interrupts * Watchdog (errant system detection) Existing specifications for USB, PCIe, ACPI, TPM, and other standards are incorporated to solidify the specification. === Server Base Boot Requirements === [Firmware](/source/Firmware) issues are addressed separately in the Server Base Boot Requirements (SBBR) specification.{{Cite web|title=Server and Infrastructure|url=https://developer.arm.com/architectures/platform-design/server-systems|last=Ltd|first=Arm|website=ARM Developer|language=en|access-date=2020-05-13}} == Platform validation == The Architecture Compliance Suite (ACS) checks whether an environment is compliant with the SBSA specification, and is provided under an Apache 2 open source license. It is available at https://github.com/ARM-software/sbsa-acs. == Compliance levels == The specification defines levels of compliance, with level 0 being the most basic, and successive levels building on prior levels. In the words of the spec, "Unless explicitly stated, all specification items belonging to level N apply to levels greater than N." === Level 0, 1, and 2 === Levels 0, 1, and 2 have been deprecated and folded into level 3. === Level 3 === Level 3 contains base-level specifications for: * PE (Processing Element--a core) features * Memory map * Interrupt controller * PPI (peripheral interrupt) assignments * MMU behavior * Clock and timer subsystem * Wake up semantics * Power state semantics * Watchdogs * Peripheral subsystems === Level 4 === Extends level 3, e.g. with support for RAS fault recovery extensions of ARMv8.2 spec. === Level 5 === Extends level 4, e.g. with support for stage 2 translation control from hypervisor as specified in ARMv8.4. === Level 6 === Extends level 5, e.g. with support for [speculative execution](/source/speculative_execution) safety features. === Level 7 === Extends level 6, e.g. with support for Arm Memory System Resource Partitioning and Monitoring (MPAM) and Performance Monitoring Unit (PMU) features. == Versions == === Initial public version === Initial public version of the SBSA was announced on January 29, 2014. === SBSA Version 3.0 === SBSA Version 3.0 was released on February 1, 2016. === SBSA Version 5.0 === SBSA Version 5.0 was released on May 30, 2018. === SBSA Version 6.0 === SBSA Version 6.0 was released on September 16, 2019. === SBSA Version 6.1 === SBSA Version 6.1 was released on September 15, 2020. === SBSA Version 7.0 === SBSA Version 7.0 was released on January 31, 2021. === SBSA Version 7.1 === SBSA Version 7.1 was released on October 6, 2022. == See also == * [UEFI](/source/Unified_Extensible_Firmware_Interface) * [ACPI](/source/Advanced_Configuration_and_Power_Interface) == References == {{reflist}} {{compu-stub}} Category:ARM architecture Category:Computer hardware standards --- Adapted from the Wikipedia article [Server Base System Architecture](https://en.wikipedia.org/wiki/Server_Base_System_Architecture) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Server_Base_System_Architecture?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.