Attach a console directly to the serial port on the CMM.
Power-cycle or reset the CMM.
The CMM's green OK LED blinks slowly as uBoot executes. The uBoot output is sent directly to the serial port.
Monitor uBoot output from your serially-attached console.
When uBoot successfully completes, the OK LED changes to steady green to let you know that the CMM has successfully started.
If the OK LED continues to blink slowly (without changing to steady green), there has been a uBoot diagnostic failure. See About Diagnostic Failures.