Bobby The Builder authored Jan 13, 2023 and Newbyte committed Jan 14, 2023

   Protect script when ram_freq is not set
   Safely load PSCI DTO to enable CPUidle driver: psci_idle
      The PSCI DTO shall only be applied if TF-A & Crust
      support CPU idle states [0]. Otherwise the CPU usage
      will be at 100%. This will not be visible in top,
      lead to overheating and battery drain.
      Worst case scenario would lead to a fried chip if
      the CPU thermal_zone does not work or is not enabled
      in DTS.

[0] #1901 (comment 1238456920)