The Server Base System Architecture (SBSA) is a hardware system architecture for servers based on 64-bit ARM processors.
It attempts to standardize PE features and key aspects of system architecture. It specified features which firmware, OS and hypervisors can rely on, to enable a suitably-built single OS image to run on all hardware compliant with this specification.
The architecture compliance suite to check if a system is compliant to the SBSA specification is available as open source software. It can be downloaded from https://github.com/ARM-software/sbsa-acs.
References
Server Base System Architecture Wikipedia(Text) CC BY-SA