Technical Paper
Memory Partitioning in Functional Safety Compliant AUTOSAR Projects
2021-09-22
2021-26-0014
In automotive systems that include one or more electrical and/or electronic (E/E) systems, it’s imperative that utmost care is given to the functional behavior at all times so as to reduce the probability of their malfunctioning. As there is a probability that the deviation can result in harm, adherence to ISO-26262 is mandatory. One such important safety requirement is Freedom From Interference (FFI). FFI for memory (mainly volatile memory- RAM) is under focus here. The intention is to prevent corruption/unintended modification of safety critical data (ASIL- A,B,C or D) by QM components. In automotive domain, the increasing complexity of modern vehicles and especially their E/E systems has made strides towards AUTOSAR projects, making them prevalent. This paper presents a method to partition RAM in such AUTOSAR projects, by activating the Memory Protection Unit (MPU) using the AUTOSAR configuration tool. Thus, the partitioned software can help to achieve FFI.
