Devterm CM3 rpi os image

Orginal image download URL

https://downloads.raspberrypi.org/raspios_full_armhf/images/raspios_full_armhf-2021-05-28/2021-05-07-raspios-buster-armhf-full.zip

Modification request list

• screen rotation for xrandr,fbcon,lightdm
• Remove the wallpaper and change the solid color #202020
• Install all rpi-related debs in the apt source

Packages in devterm apt source

1. devterm-audio-patch (check whether the 3.5 audio interface is plugged in, pull up a certain GPIO)
2. devterm-fan-temp-daemon-rpi (detect the temperature of rpi, raise the io drive fan, written in python)
3. devterm-kernel-rpi (modified kernel, 4.x series)
4. devterm-keyboard-firmware (Devterm keyboard firmware flashing tool, Advanced users only!)
5. devterm-thermal-printer (thermal printer program and systemd scripts)
6. devterm-thermal-printer-cups (CUPS filter for the thermal printer, and add the thermal printer to cups, so devterm printer can be seen in chromium)

Add clockworkpi to apt source list

see https://github.com/clockworkpi/apt/tree/main/debian

wget -O - https://raw.githubusercontent.com/clockworkpi/apt/main/debian/KEY.gpg | sudo apt-key add -

echo "deb https://raw.githubusercontent.com/clockworkpi/apt/main/debian/ stable main" | sudo tee -a /etc/apt/sources.list.d/clockworkpi.list

Config xrandr

sudo bash -c 'cat << EOF > etc/X11/Xsession.d/100custom_xrandr
xrandr --output DSI-1 --rotate right
EOF'

Config lightdm

in /etc/lightdm/lightdm.conf

greeter-setup-script=/etc/lightdm/setup.sh

setup.sh

#!/bin/bash
xrandr --output DSI-1 --rotate right
exit 0

sudo chmod +x etc/lightdm/setup.sh

Modify /etc/dphys-swapfile

CONF_SWAPSIZE=512

Change the default wallpaper

The following files changed

• /etc/xdg/pcmanfm/LXDE-pi/desktop-items-0.conf
• /etc/xdg/pcmanfm/LXDE-pi/desktop-items-1.conf
• /etc/lightdm/pi-greeter.conf
• /home/pi/.config/pcmanfm/LXDE-pi/desktop-items-0.conf

Delete wallpaper address temple.jpg
Modify the desktop_bg color to #202020

config.txt

Add dtparam=audio=on to solve the problem of no sound card under HDMI

/etc/hostname to clockworkpi

/boot/cmdline.txt ,add fbcon=rotate:1, remove quiet

Image download url

https://forum.clockworkpi.com/t/devterm-os-cm3-image-files/7151/1