docs(README): add 64-bit RISC-V QEMU instructions

[mkroening]

Related: hermit-os/hermit-rs-template#65

[marcomaas1990]

I'm getting errors with the virtio devices when compiling the hermit-rs-template for the risc-v hermit target.

[mkroening]

I'm getting errors with the virtio devices when compiling the hermit-rs-template for the risc-v hermit target.

Yeah, virtio support on RISC-V is not quite there yet. I have opened hermit-os/kernel#1217 to track that.

Are you happy with these instructions for running without virtio, though?

[marcomaas1990]

I will check the running in qemu part later, but what should I change for successfuly compiling when cargo build --target riscv64gc-unknown-hermit isn't working properly? I'm not quite sure.

[mkroening]

I will check the running in qemu part later, but what should I change for successfuly compiling when cargo build --target riscv64gc-unknown-hermit isn't working properly? I'm not quite sure.

Disabling all default features of the hermit dependency should work.

[marcomaas1990]

I'm getting errors with the virtio devices when compiling the hermit-rs-template for the risc-v hermit target.

Yeah, virtio support on RISC-V is not quite there yet. I have opened hermit-os/kernel#1217 to track that.

Are you happy with these instructions for running without virtio, though?

Yeah, they are working now.