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+# Intro
+DevTerm A06 os image based on Armbian with current kernel branch, XFCE desktop   
+and it is better to run a Ubuntu 21.04 in a VirtualBox with a good bandwidth network to do all the jobs   
+If the condition of the network is not so well, 
+the Armbian build process will fail on some packages downloading  or mirrors connecting  
+
+The entire operation requires a certain experience in linux  
+be careful  
+
+# Build armbian image for A06
+```
+cd ~
+git clone https://github.com/armbian/build.git
+git clone https://github.com/clockworkpi/DevTerm.git
+
+cd build
+git apply ~/DevTerm/Code/patch/armbian_build_a06/patch/armbian.patch
+cp ~/DevTerm/Code/patch/armbian_build_a06/patch/kernel*.patch userpatches/kernel/rockchip64-current/
+cp ~/DevTerm/Code/patch/armbian_build_a06/patch/uboot*.patch userpatches/u-boot/u-boot-rockchip64-mainline/
+
+#Then exec ./compile.sh under armbian build
+cd ~/build && ./compile.sh 
+```
+
+# Chroot image
+```
+sudo losetup -P /dev/loop0  Armbian_21.08.0-trunk_Clockworkpi-a06_focal_current_5.10.55_xfce_desktop.img
+sudo mount /dev/loop0p1 /mnt/p1
+
+cd /mnt/p1
+sudo mount --bind /dev dev/
+sudo mount --bind /sys sys/
+sudo mount --bind /proc proc/
+sudo mount --bind /dev/pts dev/pts
+sudo mv etc/ld.so.preload etc/ld_so_preload
+sudo chroot .
+```
+
+## Inside Chroot
+```
+sudo apt install wget -y
+
+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
+
+sudo apt update
+sudo apt install devterm-fan-daemon-cpi-a06 devterm-thermal-printer devterm-thermal-printer-cups devterm-wiringpi-cpi
+```
+
+### /boot/ArmbianEnv.txt
+```
+bootlogo=false
+extraargs=fbcon=rotate:1
+...
+```
+
+### autologin
+```
+sudo bash -c 'cat <<EOF > /etc/lightdm/lightdm.conf.d/12-autologin.conf
+
+[Seat:*]
+autologin-user=cpi
+autologin-user-timeout=0
+EOF'
+```
+
+### config lightdm
+```
+sudo bash -c 'cat << EOF > /etc/lightdm/lightdm.conf.d/13-rotate-dsi.conf
+[Seat:*]
+greeter-setup-script=/etc/lightdm/setup.sh
+EOF'
+
+sudo bash -c 'cat <<EOF >/etc/lightdm/setup.sh
+#!/bin/bash
+xrandr --output DSI-1 --rotate right
+exit 0
+EOF'
+
+sudo chmod +x /etc/lightdm/setup.sh
+```
+
+### config xrandr 
+```
+sudo bash -c 'cat << EOF > /etc/X11/Xsession.d/100custom_xrandr
+xrandr --output DSI-1 --rotate right
+EOF'
+```
+
+### additional software
+```
+sudo apt remove celluloid mpv 
+sudo apt install -y arandr chromium-browser vlc cpupower-gui
+```
+### /etc/default/apport 
+`enable=0`
+
+# Quit Chroot
+```
+exit
+sudo mv etc/ld_so_preload etc/ld.so.preload
+
+sudo umount /mnt/p1/dev/pts
+sudo umount /mnt/p1/dev
+sudo umount /mnt/p1/proc
+sudo umount /mnt/p1/sys
+##clear bash 
+sudo rm -rf root/.bash_history
+sudo rm usr/bin/qemu-arm-static
+
+cd -
+sudo umount /mnt/p1
+```
+
+# Flash the image to SD card
+* Linux  
+`sudo dd if=Armbian_21.08.0-trunk_Clockworkpi-a06_focal_current_5.10.55_xfce_desktop.img  of=/dev/sdX bs=8M status=progress`