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Updated How uConsole CM4 OS image made (markdown)
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Based on 4d990ec702d0b6383f6e43bbeb3e3274 http://dl.clockworkpi.com/DevTerm_CM4_v0.1a_64bit.img.bz2
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# How uConsole CM4 OS Image Is Made
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Since the uConsole and devterm are using the same main board
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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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Just need to update a new kernel for the uConsole LCD screen
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---
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original create os image from scratch is here:
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## **Base OS Image**
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https://github.com/clockworkpi/DevTerm/wiki/Create-DevTerm-CM4-OS-image-from-scratch
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The base OS image used is the DevTerm CM4 image:
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## Kernel
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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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https://github.com/clockworkpi/uConsole/tree/master/Code/patch/cm4/20230630
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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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Create a deb file of uconsole_kernel_cm4-rpi based on kernel compiled output files
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---
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Another important thing to note is the correct configuration file, "config.txt".
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## **Kernel Update**
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```
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disable_overscan=1
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dtparam=audio=on
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[pi4]
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max_framebuffers=2
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To update the kernel for the uConsole CM4:
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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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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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dtparam=spi=on
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gpio=10=ip,np
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```
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especially the line **dtoverlay=devterm-panel-uc**
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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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## Chroot
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Chroot into DevTerm_CM4_v0.1a_64bit.img
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by
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```
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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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3. Ensure the correct configuration in the `config.txt` file. Below is an example configuration:
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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 mv etc/ld.so.preload etc/ld_so_preload
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sudo chroot .
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```
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```text
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disable_overscan=1
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dtparam=audio=on
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## In chroot
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[pi4]
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max_framebuffers=2
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```
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sudo apt update
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#update kernel
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sudo apt install -y uconsole-kernel-cm4-rpi
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#install additional games/emulators
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sudo apt install -y devterm-tic80-cpi uconsole-love2d retroarch dosbox devterm-cavestory-cpi-cm4 uconsole-liko12 uconsole-lowresnx uconsole-dosbox-staging pppoe uconsole-4g-util-cm4
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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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#for 4G extension
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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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dtparam=spi=on
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gpio=10=ip,np
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```
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# uconsole does not have thermal printer
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sudo apt remove devterm-thermal-printer devterm-thermal-printer-cm4 # uconsole does not have thermal printer
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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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#pre configs
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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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#remove old configs for screen rotation,since new uconsole cm4 kernel did screen rotation
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## **Chroot Environment**
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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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edit /etc/lightdm/lightdm.conf
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comment out or delete line :
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"greeter-setup-script=/etc/lightdm/setup.sh"
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To modify the image in a chroot environment:
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exit #quit chroot
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```
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1. Mount the image:
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## Clean chroot
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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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do it everytime when you are done with chroot enviroment
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2. Set up the chroot environment:
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```
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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
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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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All the uConsole image can be found at : https://github.com/clockworkpi/uConsole/tree/master/images
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That's it , happy hacking
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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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