Disable 4 main cores and run on 5th low power core


I’ve been trying to turn off all the main cores and only try working on the 5th low power core.

I followed the short description here:

echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
echo LP > /sys/kernel/cluster/active

But I get:

What am I doing wrong here? What’s the work around?

EDIT: Perhaps the commands need to be added to some startup script?

Which one of the echo commands gives you the device busy error?

Last one:

echo LP > /sys/kernel/cluster/active

shameless bump ;-)

It turns out that the Wiki was missing some info. So I’ve updated the Wiki to show how to check which cluster & cores & frequencies you are currently running at, and how to switch purely to the 5th shadow core:

Thanks Shervin, will give it another go in little while and update you on the results.