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stratix-pi-emireduction

Documention on what I did to reduce AMI on stratux with a PI4

Set the PI4 on a fixed frequency to ensure stable performance

See also : https://www.raspberrypi.com/documentation/computers/config_txt.html#never_over_voltage Discussions : https://forums.raspberrypi.com/viewtopic.php?f=29&t=6201&start=250

Enabled and set in /boot/config.txt

# Reduce EMI
arm_freq=600
arm_freq_min=600
gpu_freq=325
gpu_freq_min=325
over_voltage=-4
over_voltage_min=-4
over_voltage_sdram=-4
over_voltage_sdram_c=-4
over_voltage_sdram_i=-4
over_voltage_sdram_p=-4
# hdmi_blanking=1 might be implemented in pi4 at some stage, we are just trying 2 not sure if that works...
hdmi_blanking=2

# Other not needed.
disable_splash=1

Add in /etc/rc.local before the exit 0 call (The above min/max frequency should also disable CPU scaling

for governor in $(ls /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor)
do
    echo "Powersave" > $governor
done

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