SAFERTOS ported to Microchip’s RISC-V soft core

SAFERTOS ported to Microchip’s RISC-V soft core

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By Nick Flaherty

Wittenstein High Integrity Systems (WHIS) has ported its safety critical real-time operating system (RTOS) to the MiV_RV32 RISC-V soft CPU IP from Microchip and joined the Mi-V Ecosystem.

The MiV_RV32 RISC-V core is the latest in a succession of Microchip processors supported by WHIS in Bristol, UK, and joining the ecosystem programme gives developers quicker access to information on SAFERTOS says WHIS.

Real-time operating systems (RTOS) are critical components in embedded systems, particularly those requiring high safety and reliability levels. RTOSs allow for deterministic task scheduling, ensuring critical operations are executed promptly and predictably. 

SAFERTOS is designed to provide high safety and reliability for embedded systems, particularly those used in aerospace, automotive, medical and industrial automation. It includes features such as memory protection, task scheduling and interrupt handling, all of which are critical for ensuring the safety and integrity of the system.

SAFERTOS has been designed specifically for the safety sector, and deterministic priority-based scheduling is the primary safety requirement. Every effort has been made to ensure deterministic behaviour is maintained. To ensure this, SAFERTOS has been independently certified many times on numerous platforms to IEC61508-3 SIL3, the highest possible SIL level for a software-only component.

The Design Assurance Pack (DAP) that provides an easy route to achieving certification of SAFERTOS once integrated into a safety product. SAFERTOS and its DAP are available pre-certified by TÜV SÜD to ISO 26262-2,-6,-8 to Automotive Safety Integrity Level D (ASIL D). The ISO 26262 standard is an adaptation of the Functional Safety standard IEC 61508 for Automotive Electric/ Electronic Systems. ISO 26262 defines functional safety for automotive equipment applicable throughout the lifecycle of all automotive electronic and electrical safety-related systems to meet safety requirements.

When designing SAFERTOS, WHIS engineers have made assumptions about the required safety goals and ASIL level. These safety goals are described within the SAFERTOS Safety Manual along with the installation and integration instructions. Developers using SAFERTOS need to confirm that the safety goals defined by SAFERTOS meet the requirements of their projects.

The DAP includes the following key elements:

Safety Manual – This document guides the use of the SAFERTOS and how it can be used to support the development of safety-critical systems.

Verification and Validation (V&V) Report – This report provides evidence of the testing and verification of the SAFE RTOS, demonstrating that it meets the relevant safety and security standards.

Source Code – The DAP includes the source code for the SAFERTOS, allowing developers to review and analyze it as part of their development process.

Traceability Matrix – This document provides a traceability matrix that links the requirements of the safety-critical system to the features and functions of the SAFE RTOS.

Tool Qualification Kit – The DAP also includes a tool qualification kit that provides evidence that the tools used in the development of the SAFERTOS meet the required safety and security standards.

By using the DAP, developers can have greater confidence in the safety and reliability of their systems and can ensure that they meet the necessary regulatory requirements.;


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