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# How uConsole CM4 OS Image Is Made
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This guide explains how to create an OS image for the uConsole CM4 module. Since the uConsole and DevTerm share the same mainboard, the process involves adapting the DevTerm CM4 OS image with updates specific to the uConsole, such as a new kernel for its LCD screen.
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This guide explains how to create an OS image for the uConsole CM4 module.
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---
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## **Base OS Image**
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# uConsole_CM4_v2.0_64bit.img.7z
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Since v2.0, cm4 os image is made by [pi-gen](https://github.com/cuu/pi-gen/tree/uconsole_arm64)
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The base OS image used is the DevTerm CM4 image:
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just clone [pi-gen](https://github.com/cuu/pi-gen/tree/uconsole_arm64) repo, branch uconsole_arm64
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- Download the base image:
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[DevTerm_CM4_v0.1a_64bit.img.bz2](http://dl.clockworkpi.com/DevTerm_CM4_v0.1a_64bit.img.bz2)
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md5sum: 4d990ec702d0b6383f6e43bbeb3e3274
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run `sudo ./build.sh` in ubuntu linux PC
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For detailed instructions on creating the base image from scratch, refer to:
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[Create DevTerm CM4 OS Image from Scratch](https://github.com/clockworkpi/DevTerm/wiki/Create-DevTerm-CM4-OS-image-from-scratch).
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---
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- kernel source: https://github.com/cuu/ClockworkPi-linux/commit/9a1e3adc9d1431889f62e633ae791bfc9a6cf535
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here is kernel compiling commands:
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```
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export KERNEL=kernel8
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export ARCH=arm64
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export CROSS_COMPILE=aarch64-linux-gnu-
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## **Kernel Update**
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make bcm2711_defconfig
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To update the kernel for the uConsole CM4:
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make -j4
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1. Use the kernel files located here:
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[uConsole Kernel for CM4](https://github.com/clockworkpi/uConsole/tree/master/Code/patch/cm4/20230630)
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mkdir -p ../modules
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rm -rf ../modules/*
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2. Create a `.deb` package for the kernel:
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`uconsole_kernel_cm4-rpi` is built from the compiled output files.
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INSTALL_MOD_PATH=../modules make modules_install
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3. Ensure the correct configuration in the `config.txt` file. Below is an example configuration:
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mkdir -p ../firmware
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rm -rf ../firmware/*
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mkdir -p ../firmware/overlays
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```text
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disable_overscan=1
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dtparam=audio=on
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cp arch/arm64/boot/Image ../firmware/$KERNEL.img
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cp arch/arm64/boot/dts/broadcom/*.dtb ../firmware
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cp arch/arm64/boot/dts/overlays/*.dtb* ../firmware/overlays/
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cp arch/arm64/boot/dts/overlays/README ../firmware/overlays/
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[pi4]
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max_framebuffers=2
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KERNEL_VER=$(make kernelrelease)
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cp arch/arm64/boot/Image.gz ../vmlinuz-${KERNEL_VER}
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[all]
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ignore_lcd=1
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dtoverlay=dwc2,dr_mode=host
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dtoverlay=vc4-kms-v3d-pi4,cma-384
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dtoverlay=devterm-pmu
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dtoverlay=devterm-panel-uc
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dtoverlay=devterm-misc
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dtoverlay=audremap,pins_12_13
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cp System.map ../System.map-${KERNEL_VER}
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cp .config ../config-${KERNEL_VER}
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dtparam=spi=on
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gpio=10=ip,np
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mkdir -p ../linux-headers-${KERNEL_VER}
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make headers_install INSTALL_HDR_PATH=../linux-headers-${KERNEL_VER}
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```
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**Key line:**
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`dtoverlay=devterm-panel-uc` (This sets the panel configuration specific to the uConsole.)
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- In pi-gen , we added some modifcations:
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1. Pull up gpio9 at boot,so that screen will turn on right away when Power on
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2. Set default lcd backlight to 3
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3. Set default desktop to be large screen
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4. No wallpaper, only black color
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5. Fn+<> to adjust lcd backlight
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---
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## **Chroot Environment**
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To modify the image in a chroot environment:
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1. Mount the image:
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```bash
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sudo mkdir -p /mnt/p1
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sudo losetup --show -f -P DevTerm_CM4_v0.1a_64bit.img # Assume loop0
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sudo mount /dev/loop0p2 /mnt/p1
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sudo mount /dev/loop0p1 /mnt/p1/boot
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```
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2. Set up the chroot environment:
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```bash
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cd /mnt/p1
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sudo mount --bind /dev dev/
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sudo mount --bind /sys sys/
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sudo mount --bind /proc proc/
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sudo mount --bind /dev/pts dev/pts
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sudo chroot .
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```
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3. Inside the chroot environment:
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- Update the system and kernel:
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```bash
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sudo apt update
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sudo apt install -y uconsole-kernel-cm4-rpi
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```
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- Install additional software (games, emulators, and utilities):
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```bash
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sudo apt install -y devterm-tic80-cpi uconsole-love2d retroarch dosbox \
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devterm-cavestory-cpi-cm4 uconsole-liko12 uconsole-lowresnx \
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uconsole-dosbox-staging pppoe uconsole-4g-util-cm4
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```
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- Configure the 4G extension module (optional):
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```bash
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sudo bash -c 'cat << EOF > /etc/modprobe.d/blacklist-qmi.conf
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blacklist qmi_wwan
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blacklist cdc_wdm
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EOF'
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```
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- Remove unnecessary software (e.g., thermal printer utilities, as uConsole does not include a thermal printer):
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```bash
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sudo apt remove devterm-thermal-printer devterm-thermal-printer-cm4
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```
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- Perform pre-configurations:
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```bash
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cd /usr/local/bin/
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git clone -b uconsole-cm4 https://github.com/cuu/skel.git
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cp -rf skel/etc/xdg/autostart/first-touch.desktop /etc/xdg/autostart/
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cp -rf skel/usr/local/bin/chgpas.sh /usr/local/bin/
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```
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- Clean up old screen rotation settings (the new kernel already handles screen rotation):
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```bash
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nano /boot/cmdline.txt # Remove "fbcon=rotate:1"
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rm -rf /etc/X11/Xsession.d/90custom_xrandr
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rm -rf /etc/lightdm/setup.sh
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nano /etc/lightdm/lightdm.conf # Comment out or delete the line:
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# greeter-setup-script=/etc/lightdm/setup.sh
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```
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4. Exit the chroot environment:
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```bash
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exit
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```
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---
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## **Clean Chroot Environment**
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After finishing work in the chroot environment, clean up:
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```bash
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cd -
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sudo umount /mnt/p1/dev/pts
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sudo umount /mnt/p1/dev
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sudo umount /mnt/p1/proc
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sudo umount /mnt/p1/sys
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# Clear bash history
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sudo rm -rf /mnt/p1/root/.bash_history
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sudo umount /mnt/p1/boot
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sudo umount /mnt/p1
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sudo losetup -D /dev/loop0
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```
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---
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## **Final Notes**
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- All official uConsole OS images can be found here:
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[uConsole Images Repository](https://github.com/clockworkpi/uConsole/tree/master/images)
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- Happy hacking!
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