Banana Pro is a card-sized low-power single board ARM-based computer (SoC) which can run Android, Linux distros and other systems. In this article, we will see how to change the default CPU overclocking settings for the Banana Pro board. As a result, it will be possible to get a fine-tuned CPU clock and reduced chip temperature. Let's see how.
So I decided to perform fine tuning of the CPU clock and change the governor. Here are the steps if you are interested in doing the same.
For better CPU clock scaling it is better to set the governor "on-demand", which provides smoother clock control depending on the CPU load. Run the following script (as suggested by the official linux-sunxi project for the AllWinner A20 chip):
#!/bin/sh echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor echo 336000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq echo 1008000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq echo 40 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold echo 200000 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
Now check if you are satisfied with the current settings. If you are happy with your board's current performance, you need to set these settings to be applied at every boot.
If you are using a distro with systemd, create a new unit and put it here:
Enter the following inside the governor.service file:
[Unit] Description=CPU governor DefaultDependencies=no [Service] Type=simple ExecStart=/opt/governor [Install] WantedBy=multi-user.target
I am assuming that you saved the governor.service shell script mentioned above as the /opt/governor file and made it executable with the chmod +x /opt/governor command.
f you are using a distro without systemd, add a new line to the /etc/rc.local file:
That's it. Now you should get very flexible CPU clock scaling. Also, this trick reduced the chip's temperature from 49 degrees to 41 which is good.
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