WIP: Getting Verilator working on Mac

[ppannuto]

Pull Request Overview

Was trying to play around with verilator and OT some today, but ran into several x-platform issues :(. It's a pretty high priority for me to try to keep Tock as cross-platform-friendly as possible, and I think I'm pretty close to getting this working, but I need to step away for a bit.

Testing Strategy

Many many failed builds.

TODO or Help Wanted

I believe the only thing missing at this stage is a version of the riscv32 toolchain that can build the rest of the firmware (OT demands a riscv32-[...] toolchain, while homebrew's prebuilt images only ship a riscv64-[...] toolchain, and the riscv toolchain apparently doesn't build on Mac.

I think if I had a prebuilt test_rom_sim_verilator.scr.39.vmem and otp_img_sim_verilator.vmem, everything would be working.

Documentation Updated

• Updated the relevant files in /docs, or no updates are required.

Formatting

• Ran make prepush.

[ppannuto]

Okay, so I get further now, but it bails out with this:

sw/device/silicon_creator/rom_ext/meson.build:153:6: ERROR: Program '/Volumes/code/external/opentitan/build-out/sw/host/rom_ext_image_tools/signer/rom_ext_signer' not found or not executable

The build-out/sw/host/rom_ext_image_tools/signer/ directory is empty, but it seems like this is a meson error somehow, as it looks like it's trying to run a build artifact before it's built it? @alistair23 do you have any insight into where I should look next to debug this?

meson-log.txt

[alistair23]

Hmmmm.... That's a strange error. I don't see anything like that when I build OT. The best bet is probably to raise an issue with github.com/lowrisc/opentitan for adding OS X support

You might be able to instead just use pre-built binaries though and not even worry about building the ROM signer