Definition
The kernel log is the most detailed diagnostic source on an ASIC miner, recording what the firmware sees as it boots each hashboard and runs the device. Accessible from the miner's web interface or over SSH, it reports per-chain ASIC chip counts, board temperatures, voltage and frequency settings, EEPROM or PIC read results, and the hardware errors the controller encounters. For anyone diagnosing a fault, the kernel log is the first place to look because it states exactly what the machine detected rather than what it should have.
Reading chip counts
The single most useful line family reports how many ASICs each chain found. A message such as "Chain[0]: find 0 asic" means that chain detected no chips, while a healthy board reports the model's full expected count (for example 120 chips on certain models). A chain showing a partial count points to a specific dead or pseudo-soldered chip breaking the daisy chain, whereas zero chips often points to a cable, power, or EEPROM problem upstream of the silicon.
Using it for diagnosis
Because the log distinguishes cable faults from board faults, a common technique is to swap cables between chains and re-read the log: if the zero-chip symptom follows the board rather than the cable, the board is faulty. The log also surfaces voltage-domain and frequency anomalies that hint at where on the board to probe.
The kernel log drives the rest of the repair workflow. See Test Fixture for bench-testing the suspect board it identifies, and EEPROM (Hashboard) for the calibration data whose read errors appear in the log.
In Simple Terms
The kernel log is the most detailed diagnostic source on an ASIC miner, recording what the firmware sees as it boots each hashboard and runs…