It’s been a while, but there’s a new release of Ironclad, the formally verified, hard real-time capable kernel written in SPARK and Ada. Aside from the usual bugfixes, this release moves Ironclad from multiboot to Limine, adds x86_64 ACPI support for poweroff and reboot, improvements to PTY support, the VFS layer, and much more.
The easiest way to try out Ironclad is to download Gloire, a distribution that uses Ironclad and the GNU tools. It can be installed in both a virtual machine and on real hardware.
Wow, a kernel written in Ada.
Brings back memories of something to do with Z machines and B state proovers. Sounds like the distro to use for your nuclear power station.