Overclock the S905Y2?

Zero Series
4

Well we could try decompiling and recompiling the dtb. In my testing it looked like it would work.

sudo apt update; sudo apt install -y device-tree-compiler
mv meson-g12a-radxa-zero.dtb meson-g12a-radxa-zero.dtb.orig
dtc -I dtb -O dts meson-g12a-radxa-zero.dtb.orig -o meson-g12a-radxa-zero.dts

Edit the dts using your preferred text editor and scroll down to the opp-table.

Make it look exactly like this: (we are only adding the opp-2000000000 bit)

		opp-1800000000 {
			opp-hz = <0x00 0x6b49d200>;
			opp-microvolt = <0xef808>;
		};

		opp-2004000000 {
			opp-hz = /bits/ 64 <2004000000>;
			opp-microvolt = <1022000>;
			turbo-mode;
		};
	};

Compile:
dtc -I dts -O dtb meson-g12a-radxa-zero.dts -o meson-g12a-radxa-zero.dtb

After reboot check:
ls /sys/devices/system/cpu/cpufreq/boost

if available:
echo "1" | sudo tee /sys/devices/system/cpu/cpufreq/boost

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