Build oreboot with Docker.
First, run
./prepare
This will prepare a Docker image with the Rust compiler from DockerHub.
Then, run
git clone https://github.com/oreboot/oreboot.git oreboot
in order to check out oreboot into the subdirectory oreboot.
Then you need to put file bzImage containing a Linux kernel (or LinuxBoot) into subdirectory oreboot, and then:
cd oreboot
cat rust-toolchain | egrep 'toolchain|channel|components' |sed -e 's;"llvm-tools-preview", ;;' >rust-toolchain.new && mv rust-toolchain.new rust-toolchain
MAINBOARD=src/mainboard/amd/romecrb PAYLOAD_A="${PWD}/bzImage" ../build
Note that build needs a device tree compiler (dtc) on the host since it's not in the Docker image.
Other interesting invocations would be:
RUSTFLAGS="--emit asm -C llvm-args=-x86-asm-syntax=intel" CARGO_NET_OFFLINE=true MAINBOARD=src/mainboard/amd/romecrb PAYLOAD_A=${PWD}/orebootkernel DTC=dtc ../build # This also leaves generated assembly code in the target dir (".s" files)