Turris Omnia CPU downclock

Hi!
Is it possible to downclock CPU of Turris Omnia?

As I understand correctly, CPU frequency can’t be automatically scaled because of

[    0.401748] mvebu-pmsu: CPU hotplug support is currently broken on Armada 38x: disabling
[    0.401754] mvebu-pmsu: CPU idle is currently broken on Armada 38x: disabling

and I can’t use /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor.

But is it possible to just downscale CPU from 1.6GHz to 800MHz? By kernel boot parameters, for example.

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