Overclock the S905Y2?

#1

Hi,

Is it possible and safe to overclock the S905Y2? How?..

Thanks! :slightly_smiling_face:

#2

I do so and haven’t had any problems. I patch the following when building a kernel.

--- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi	2021-12-02 05:44:16.837136220 -0500
+++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi	2021-12-04 05:40:01.518834737 -0500
@@ -111,6 +111,12 @@
 			opp-hz = /bits/ 64 <1800000000>;
 			opp-microvolt = <981000>;
 		};
+
+		opp-2004000000 {
+			opp-hz = /bits/ 64 <2004000000>;
+			opp-microvolt = <1022000>;
+			turbo-mode;
+		};
 	};
 };

I would guess, maybe an overlay could be created that would achieve the same goal or one could just edit the dtb file on the board. Anyway, once applied echo "1" > /sys/devices/system/cpu/cpufreq/boost and it will boost the cores: 1992000 1992000 1992000 1992000

#3

Hi,

Thanks c0rnelius.

I don’t compile the kernel.

So no easier way to do it?

Thanx!

#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

1 Like
Overlay for W1 on the Zero?
#5

This overlay should also work.

/dts-v1/;
/plugin/;

/ {
	compatible = "radxa,zero", "amlogic,g12a";

	fragment@0 {
		target-path = "/opp-table";
		__overlay__ {
			opp-2004000000 {
				opp-hz = /bits/ 64 <2004000000>;
				opp-microvolt = <1022000>;
				turbo-mode;
			};
		};
	};
};
Enable GPIO in Manjaro
#6

I managed to compile overlay like this and it works alright. But /sys/devices/system/cpu/cpufreq/boost always resets on boot. How do i activate boost permanently (not in a way to stop cpu from lowering clocks on idle, just so i don’t have to activate it every reset)

#7

remove turbo-mode; from the overlay or create a script and service.

paste the following into a terminal:

sudo tee /usr/bin/tweaks <<EOF
#!/bin/bash

if [ -f /sys/devices/system/cpu/cpufreq/boost ]; then
	echo "1" > /sys/devices/system/cpu/cpufreq/boost;
fi
EOF
sudo chmod +x /usr/bin/tweaks
sudo tee /etc/systemd/system/tweaks.service <<EOF
[Unit]
Description=Radxa Zero System Tweaks
ConditionFileIsExecutable=/usr/bin/tweaks
After=sysinit.target local-fs.target network.target bluetooth.target

[Service]
Type=forking
ExecStart=/usr/bin/tweaks
TimeoutSec=0
RemainAfterExit=yes
StandardOutput=journal+console
StandardError=journal+console

[Install]
WantedBy=multi-user.target
EOF
sudo systemctl enable tweaks
sudo systemctl start tweaks
Random wifi speed drops