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Raspberry Pi OS
This is the default OS that is provided by the Raspberry Pi foundation and comes preinstalled on the micro SD card that the Hackberry ships with.
Device Specific Installations
Raspberry Pi Zero 2W
Amend the config.txt with the following line:
dtoverlay=vc4-kms-dpi-hyperpixel4sq
If you mount the micro SD card on a computer, it will be located on the bootfs partition under /firmware/config.txt.
If you want to edit the file on a running Raspberry Pi (either through SSH or by attaching an external display via HDMI), it will be located under /boot/firmware/config.txt.
Screen blanking should be disabled by default, but it is never a bad idea to manually disable it by running sudo raspi-config and navigating to Display Options > Screen Blanking.
Hackberry CM5
The following image is a clean install of Raspberry Pi OS. It comes with a configured config.txt to enable the display. Furthermore, it comes with Pi-Apps and Alacritty preinstalled. It also includes the battery voltage script.
rpios-base-compressed.img.xz
rpios-base.checksum.txt