A software update service with self-protection capabilities

Integration of system components is a crucial challenge in the design of embedded real-time systems, as complex non-functional interdependencies may exist. We propose a software update service with self-protection capabilities against unverified system updates - thus solving the integration problem in-system. As modern embedded systems may evolve through software updates, component replacement or even self-optimization, possible system configurations are hard to predict. Thus the designer of system updates does not know the exact system configuration. This turns the proof of system feasibility into a critical challenge. This paper presents the architecture of a framework and associated protocols enabling updates in embedded systems while ensuring safe operation w.r.t. non-functional properties. The proposed process employs contract based principles at the interfaces towards applications to perform an in-system verification. Practical feasibility of our approach is demonstrated by an implementation of the update process, which is analzed w.r.t. the memory consumption overhead and execution time.