Environment Preparation
- Install Ubuntu 22.04.2 LTS.
- Install dependencies:
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sudo apt install binfmt-support qemu-user-static gcc-10-aarch64-linux-gnu kernel-package fakeroot simg2img img2simg mkbootimg bison flex gcc-aarch64-linux-gnu pkg-config libncurses-dev libssl-dev unzip git
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Download Source
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git clone https://github.com/OpenStick/linux.git --depth=1
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Kernel Build
CPU frequency table tuning
Edit:
linux/drivers/clk/qcom/a53-pll.c
Adjust/extend frequency entries carefully, balancing performance, power, and thermals.
Edit DTS OPP table as needed:
linux/arch/arm64/boot/dts/qcom/msm8916.dtsi
Build steps
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cd linux
export CROSS_COMPILE=aarch64-linux-gnu-
export ARCH=arm64
make msm8916_defconfig
make menuconfig
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USB serial support (for Klipper-like USB devices)
Enable relevant USB CDC ACM / USB Serial options in menuconfig.
Build packages
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make -j`nproc` bindeb-pkg
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Expected outputs:
- kernel
.deb files (linux-image, linux-headers)
Image.gz- target DTB (
msm8916-handsome-openstick-*.dtb)
Prepare RootFS Image
Get base Debian image
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mkdir ~/rootfs
cd ~/rootfs
wget https://github.com/OpenStick/OpenStick/releases/download/v1/debian.zip && unzip debian.zip
mv ./debian/rootfs.img ~/rootfs
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simg2img rootfs.img root.img
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Mount and chroot
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sudo mount root.img /mnt
sudo mount --bind /proc /mnt/proc
sudo mount --bind /dev /mnt/dev
sudo mount --bind /dev/pts /mnt/dev/pts
sudo mount --bind /sys /mnt/sys
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Copy kernel deb files into /mnt, then:
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sudo chroot /mnt
dpkg -l | grep -E "linux-headers|linux-image" |awk '{print $2}'|xargs dpkg -P
dpkg -i *.deb
rm linux-*.deb
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Enable rc.local with systemd
Create /etc/systemd/system/rc-local.service and /etc/rc.local, then:
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systemctl daemon-reload && systemctl enable rc-local
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Locale and apt source cleanup
- Install and configure locales:
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sudo apt install locales
sudo dpkg-reconfigure locales
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- Remove invalid old source list entries if needed.
Unmount
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sudo umount /mnt/proc
sudo umount /mnt/dev/pts
sudo umount /mnt/dev
sudo umount /mnt/sys
sudo umount /mnt
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Convert back to sparse image
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img2simg root.img rootfs.img
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Build Boot Image
Required files:
Image.gz- Target DTB (for your hardware variant)
initrd.img-* from rootfs /boot
Example (ufi001c):
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cat Image.gz msm8916-handsome-openstick-ufi001c.dtb > ufi001c-kernel-dtb
mv initrd.img-* initrd.img
mkbootimg --base 0x80000000 --kernel_offset 0x00080000 --ramdisk_offset 0x02000000 --tags_offset 0x01e00000 --pagesize 2048 --second_offset 0x00f00000 --ramdisk initrd.img --cmdline "earlycon root=PARTUUID=a7ab80e8-e9d1-e8cd-f157-93f69b1d141e console=ttyMSM0,115200 no_framebuffer=true rw" --kernel ufi001c-kernel-dtb -o ufi001c-boot.img
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Replace boot.img and rootfs.img in the flashing package with your generated files.