Hardening Firmware Against Edge Cases

Overview

Improving long-term system stability by identifying and eliminating rare firmware failure conditions.

Technologies

Embedded software | Firmware | Validation | System reliability

Define the Problem

A deployed embedded system occasionally locked up after extended periods of operation, despite passing normal functional testing.

Diagnose the Root Cause

Long-duration testing and system logging identified a rare timing condition linked to silicon-level behaviour that only occurred under specific operating circumstances.

Key engineering challenges included:

• Extremely low occurrence rate

• Long-term testing requirements

• Difficult fault reproduction

• System-level interactions

Deliver the Solution

We redesigned the firmware architecture and scheduling approach to eliminate the triggering conditions.

Key Outcomes

• Eliminated long-term lockups

• Improved field reliability

• Increased system stability

• Reduced support risk