0x1800000 — SMC: silent sensor

SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; this code was obtained in the lab by removing the integrated circuit of the proximity module; the path involved runs from the logic board connector to the proximity sensor, the ambient light sensor and the sensor controller. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.