IN Brief:
- AMI MegaRAC OneTree is now available on Nuvoton’s quad core Cortex-A35 Arbel NPCM8XX BMC family.
- The platform supports Redfish, IPMI 2.0, MCTP, PLDM and SPDM for interoperable server management.
- Nuvoton establishes its security chain from immutable Boot ROM through secure boot and runtime operation.
Nuvoton Technology and AMI have made MegaRAC OneTree firmware available on the Arbel NPCM8XX baseboard management controller family, combining a commercially supported OpenBMC distribution with Nuvoton’s quad core Arm Cortex-A35 management silicon.
The implementation is available for evaluation on Nuvoton’s Arbel board, with both companies supporting migration to production server platforms. The architecture targets AI infrastructure, cloud systems and enterprise servers where the management controller remains available independently of the main host processors and operating system.
A baseboard management controller handles power control, hardware health, firmware operations, sensor data and remote maintenance even when the host operating system is unavailable. As server platforms add accelerators, storage devices, network interfaces, cooling hardware and more complex power systems, that separate management plane has to coordinate a growing number of components from different suppliers.
MegaRAC OneTree on Arbel supports Redfish, IPMI 2.0, Management Component Transport Protocol, Platform Level Data Model and Security Protocol and Data Model. Those standards cover different parts of the management stack, from system administration and telemetry to communication between embedded controllers and authenticated exchange of device information.
Redfish provides a REST based interface for system management, while IPMI remains common in installed server estates. MCTP carries management messages between components, PLDM defines structured commands and data models above that transport, and SPDM provides mechanisms for device authentication, measurement and secure session establishment.
Common protocols reduce the amount of vendor specific integration required when a BMC has to supervise several independently managed devices. An accelerator card, NVMe drive, network adapter, power shelf or cooling controller can expose management information through defined interfaces rather than requiring a separate proprietary path for each subsystem.
Arbel begins its security chain in immutable Boot ROM and extends verification through secure boot into runtime operation, while the NPCM8XX family includes OCP S.A.F.E. certification and cryptographic capabilities validated to FIPS 140-3 requirements.
The security boundary is unusually important because a BMC operates beneath the host operating system and retains privileges over firmware, power and hardware state. Compromise at that level can affect functions that conventional endpoint software cannot supervise, so the integrity of the boot chain and management firmware has to be established before the host workload begins.
AMI provides the maintained software layer through MegaRAC OneTree, giving server manufacturers a supported OpenBMC route rather than requiring each platform team to maintain its own board specific branch from the upstream project. Nuvoton lists long term maintenance, security updates and commercial support as part of the combined platform.
The associated development kit combines the Nuvoton Arbel evaluation board with AMI’s Series 997 sensor board, a host system and cooling hardware. The sensor board reproduces functions found in data centre equipment, including current and voltage monitoring, temperature sensing, fan control and storage management interfaces.
NVMe, SAS and SATA connections, I²C devices and backplane management functions allow firmware developers to exercise realistic sensor and management paths instead of validating the BMC in isolation. That is particularly useful during platform bring up, where errors often appear at the boundary between firmware assumptions and the behaviour of the attached hardware.
AI servers increase the number of such boundaries because higher accelerator density brings more telemetry, power control and thermal management endpoints into the same chassis. Liquid cooling can add pumps, coolant sensors and control loops to a management environment that already covers fans, processors, storage and board temperatures.
MegaRAC OneTree for Arbel NPCM8XX is available for evaluation and development, with production support offered by both companies. The combination gives server designers a maintained OpenBMC software path on top of Nuvoton’s security architecture, reducing the amount of platform specific integration required before management functions can move from an evaluation board into deployed hardware.
