NixOS configuration for the ODROID HC4 microcomputer
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Craige McWhirter 5a05513425
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Hardkernel NixOS for ODROID HC4

This is an unofficial installation configuration of NixOS 21.05 for the Hardkernel ODROID HC4 microcomputer.

To build an image that can be flashed to an SD card, run:

$ nix-build

However, you might want to add your own SSH keys to the odroidhc4 configuration before doing so.

To flash the created image run

$ nix-shell -p etcher
# If you have polkit enabled
$ etcher
# If you don't have polkit
$ sudo etcher --no-sandbox

Select the SD card image from result/sd-image/nixos-sd-image-21.05pre-git-aarch64-linux.img and the SD card device and flash the image onto the device.

Boot the device

Insert the flashed SD card into your HC4 device and let it boot.

Control your device over SSH

Log in to your booted device over SSH and run an initial nixos-rebuild switch to get the non-cross compiled versions of all packages. This will also update the u-boot bootloader to load the recently built version of NixOS.

NixOS generations and limitations of the current configuration

The bootloader is set up using the boot.ini script to enable ease of use with the pre-flashed Petitboot that is installed in the HC4 SPI flash memory. I have yet to find out how to allow this Petitboot setup to support multiple generations of NixOS so that you can choose a previous version of the operating system when booting the device. However, by running the /nix/var/nix/profiles/system-GENERATION-link/bin/switch-to-configuration switch command you can revert to a previous generation if you are able to boot the device on the most recent one.