Earlier quoted context omitted.
It may be counterintuitive at first, but why wouldn't be possible? It's one of the perks of "offline" hardware without subscriptions or DRM. You build a piece of hardware (cartridge) that attaches to another one (console) and it works. As long as the console works, there shouldn't be a problem.
> It may be counterintuitive at first, but why wouldn't be possible? For the same reason it wasn't possible at the time for a third-party to make N64 cartridges themselves to avoid Nintendo's fees. But I assume these lockout chips are replicated or circumvented by now.
Nintendo's boot code is under copyright and thus cannot be used. So the boot code distributed with Libdragon is signed by finding a hash collision with a brute force tool running on the GPU[1]. Fun stuff!
[1] https://github.com/DragonMinded/libdragon/tree/trunk/boot#bu...