A disappearing Service Processor (2025)
Summary
Oxide Computer documents a debugging saga for a disappearing Service Processor in the Cosmo sled, detailing the investigative steps across hardware, firmware, and memory architecture. The post explains how MPU configurations, FMC bus timing, and cache attributes led to intermittent network disappearance, and how a base address realignment resolved the issue. It highlights the importance of transparent vendor documentation and careful hardware-software interaction debugging in complex embedded systems.