February 29, 20242 yr At least for legacy kernels, it possible to use Radxa's overlay for the 25W PoE hat. This should allow you to use the PWM fan on the PoE hat. #!/bin/bash # Install linux headers apt-get install -y linux-headers-legacy-rk35xx # Download and compile the device tree overlay h=/usr/src/linux-headers-$(uname -r) wget https://raw.githubusercontent.com/radxa/overlays/f2679399887b678dec62cb50cb44c767a2bcb293/arch/arm64/boot/dts/rockchip/overlays/rock-5b-radxa-25w-poe.dts cpp -nostdinc -I $h/include -I $h/arch -undef -x assembler-with-cpp rock-5b-radxa-25w-poe.dts | dtc -I dts -O dtb -o rock-5b-radxa-25w-poe.dtbo # Install device tree overlay mkdir -p /boot/overlay-user mv rock-5b-radxa-25w-poe.dtbo /boot/overlay-user echo 'user_overlays=rock-5b-radxa-25w-poe' >>/boot/armbianEnv.txt
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