런타임 이벤트 및 상태 로깅을 통한 차량용 ECU의 리셋 원인 분석 방법

초록

Unpredictable resets occurring in automotive ECUs are an important problem that harms reliability and stability. However, because reset is accompanied by initialization, it is difficult to find clues for cause analysis after occurrence. Even with external storage devices, reset has a variety of causes, making it difficult to select which information will be needed for cause analysis. Existing debugging methods available for cause analysis either collect insufficient information for reset cause analysis or have limited scope of analysis. In this paper, we propose a reset cause analysis platform that collects information from the runtime of an ECU for vehicles, generates logs, thereby identifying the cause and screening the logs that need to be investigated first. The proposed platform limits the most fundamental level of causes to eight, and analyzes the logs to determine what kind of causes they are. We have confirmed that it operates with an overhead of 3% CPU, 1.6% volatile memory, and 1% non-volatile memory, and we present examples of reset cause analysis. The methodology for reset cause analysis proposed in this work can help with fast cause analysis in the development of an ECU for vehicles, reducing the development cost associated with reset.

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