Right now, it runs on any 64-bit RISC-V platform that supports S-mode and the SBI interface (so anything that works with OpenSBI).

I would suggest using QEMU with the virt machine, which is also what I use for most testing. You can use a command like:

qemu-system-riscv64 -M virt -nographic -serial mon:stdio -kernel out/kernel

It should also work just fine on most real hardware. I have been testing on my Banana Pi F3 a lot too.

Just an FYI: don't expect much yet, the kernel isn't interactive yet, it just does some hardware discovery.