[OpenPower-Firmware] Limit the CPU frequency

[Artem Senichev]

Hi guys,

We have some hardware problem with 12-cores P8 CPU running at high
load with maximum frequency.
A workaround is to limit the frequency from the OS (for example, using
`cpupower frequency-set`).

Fixing this issue can take a lot of time, so I want to use the
workaround as a temporary solution, but I want to set the upper limit
in the firmware layer to prevent it from being changed by the OS
kernel.

Is it possible to limit the maximum CPU's frequency from hostboot or skiboot?

--
Artem Senichev
Software Engineer, YADRO.