If you don't mind waiting a week for it to boot.
) used Semu, a light RISCV32 emulator, and cross-compiled it with llvm-mos, allowing the code to run on the C64's MOS Technologies 6502 processor. It needs to be pointed out that this was done via an emulator and not on real hardware, though it's only a matter of time before that happens.
Using the VICE Commodore emulator, Kortmann enabled"warp mode" which showed the first boot messages within a few minutes, though that will take much longer on a real machine. The screenshot below took a few hours with Warp mode, which means a real C64 will take a week or more to fully boot Linux. The original Commodore 64 came with just 64KB of memory and running a lightweight OS is simply not possible without the use of a RAM Expansion Unit. Kortmann doesn't specify which REU he used, but C64 REUs were available with up to 512KB, or a whopping 0.5MB of memory. The C64's MOS Technology processor running at around 1MHz isn't what you'd call a speed demon either.
Kortmann believes there's a lot of room for improvement, saying a 10x speedup could be possible. Still, given the limitations of the C64 hardware, even with a 10x speedup, don't expect to go running much in the way of software once you do finish the boot sequence. This is the kind of thing that serves little purpose beyond proving it can be done. That doesn't make it any less cool, though..
Is Linux on a C64 practical? Not in the slightest. But it sure is an impressive feat and one that fans of one of the greatest computers of all time will appreciate.
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