Installing a NetBSD 11 Desktop Environment on Raspberry Pi 4

NetBSD 11 can be successfully deployed as a desktop operating system on a Raspberry Pi 4, provided users perform manual configuration of the boot firmware and wireless drivers. This setup offers an alternative for users seeking an open-source operating system that avoids modern 'AI slop' while maintaining a functional graphical interface.

Booting and Firmware Configuration

To initiate the boot process, users must flash the NetBSD arm64 image to an SD card and manually inject the Raspberry Pi UEFI firmware. This involves mounting the SD card's first partition and copying the firmware files to the `/mnt/netbsd-boot` directory so the UEFI BIOS can recognize the NetBSD partitions.

Once the system boots, it automatically begins resizing the root filesystem. Users can then log in as root to set a password and create a standard user account with wheel privileges.

“NetBSD is the only open-source operating system in development that I know of, that doesn't include AI slop.”

— NetBSD 11 desktop on a Raspberry Pi 4

Networking and Driver Fixes

The Raspberry Pi 4's wireless adapter may not autoconfigure initially because the kernel cannot find the necessary NVRAM files. To fix this, a symbolic link must be created in the `/libdata/firmware/if_bwfm` directory to point the system to the correct model-specific text file.

After the link is established and the system is rebooted, the `bwfm0` device appears in `ifconfig`. Users can then configure the WiFi by editing `rc.conf` to enable the interface and updating `wpa_supplicant.conf` with their specific SSID and password.

Desktop Environment and Software

While NetBSD includes a basic ctwm window manager, the NsCDE (Not so Common Desktop Environment) is recommended for a more modern experience. This environment is based on fvwm and requires installing several dependencies, including `fvwm3`, `python3`, and `qt5`, before being built from source.

The guide demonstrates that once NsCDE is configured, users can install essential tools like `pcmanfm` for file management and `dillo` for web browsing. These are managed via `pkgin`, which allows for the installation of prebuilt binary packages to simplify the setup process.

Hardware Constraints and Limitations

The feasibility of this setup depends heavily on the specific Raspberry Pi model used. While the Raspberry Pi 4 provides sufficient resources for a desktop environment, older hardware like the Raspberry Pi 1 may struggle with memory and swap limitations during the installation of complex software packages.

Users should also note that while the system is functional, it remains an 'obscure' configuration that requires manual intervention for many standard features, such as volume control and file management, which must be explicitly mapped to specific applications in the configuration files.