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92 lines
2.8 KiB
Markdown
92 lines
2.8 KiB
Markdown
---
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layout: post
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summary: "Up to 1.8 GHz without throttling"
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title: "Overclocking StarFive VisionFive 2"
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---
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# TL;DR
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Apply a [patch](/posts_media/2023-10-21-overclocking-starfive-vf2/overclock_vf2.patch) to JH7110_VisionFive2_upstream branch of [starfive-tech/linux](https://github.com/starfive-tech/linux). `make -j4; make modules_install; make install; make dtbs_install`. Edit /boot/uEnv.txt `fdtfile` with a proper devicetree path. Profit!
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# Introduction
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StarFive VisionFive 2 is a second generation of RISC-V boards from StarFive, which is based on StarFive JH7110 SoC with 4 of SiFive's U74 cores.
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The SiFive U74 max frequency in StarFive JH7110 is 1.5 GHz by default, but it can perform much better, because even under load the temperature never exceeds 60ºC, so overclocking is worth it. The JH110 can be overclocked to 1.8 GHz, which will be done in this article.
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Warning: You are responsible for the safety of your board.
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# Prerequisites
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- Tree of [starfive-tech/linux](https://github.com/starfive-tech/linux)
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- [Patch](/posts_media/2023-10-21-overclocking-starfive-vf2/overclock_vf2.patch)
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- Some kind of cooling (just a fan, or with a heat sink)
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# Steps
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## Apply a patch
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```shell
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cd linux
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git checkout JH7110_VisionFive2_upstream
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git apply /path/to/patch/overclock_vf2.patch
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```
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## Compile the kernel
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```shell
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make starfive_visionfive2_defconfig
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make -j4
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```
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## Install new kernel
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Run as root
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```shell
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make modules_install
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make install
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make dtbs_install
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```
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## Configure bootloader
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Your bootloader should be configured to use `starfive/jh7110-starfive-visionfive-2-v1.3b.dtb` devicetree file.
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If you are using default Debian option then your `/boot/uEnv.txt` file should look like this
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```ini
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fdt_high=0xffffffffffffffff
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initrd_high=0xffffffffffffffff
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kernel_addr_r=0x44000000
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kernel_comp_addr_r=0x90000000
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kernel_comp_size=0x10000000
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fdt_addr_r=0x48000000
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ramdisk_addr_r=0x48100000
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boot_targets=distro mmc0 dhcp
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# Fix wrong fdtfile name
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fdtfile=KERNEL_VERSION/starfive/jh7110-starfive-visionfive-2-v1.3b.dtb
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# Fix missing bootcmd
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bootcmd=run load_distro_uenv;run bootcmd_distro
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```
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## Reboot and have fun
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After you successfully overclocked your VF2, you can ask yourself a question - "can it do better?". [No, it can't](http://forum.rvspace.org/t/how-do-you-overclock-the-vf2/2920/5).
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# Tests
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All tests were performed out at an ambient temperature of 21ºC.
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## Stress
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25-minute `stress -c 8` run. [Raw data (without heatsink) (timestamp, temp * 1000)](/posts_media/2023-10-21-overclocking-starfive-vf2/vf2_stress_data), [raw data (with heatsink)](/posts_media/2023-10-21-overclocking-starfive-vf2/vf2_stress_data_heatsink).
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# Known issues
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## Long boot from NVMe
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My VisionFive 2 after overclocking now loads up to 7 minutes instead of 30 seconds. (Needs further research)
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