Taskfile.yaml

version: "3"

vars:
  HELLO_DIR: payloads/aarch64-hello
  HELLO_ELF: payloads/aarch64-hello/hello.elf
  CBFSTOOL: '{{.CBFSTOOL | default "cbfstool"}}'

tasks:
  build-images:
    desc: Build the QEMU disk images
    dir: images
    cmds:
      - make all

  build-hello-payload:
    desc: Build the aarch64 hello-world coreboot payload (uses a debian:bookworm container so no cross-gcc is required on the host)
    dir: "{{.HELLO_DIR}}"
    sources:
      - hello.S
      - hello.ld
    generates:
      - hello.elf
    cmds:
      - |
        docker run --rm -v "$PWD":/work -w /work debian:bookworm bash -c '
          set -e
          export DEBIAN_FRONTEND=noninteractive
          apt-get update -qq
          apt-get install -y -qq gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu
          aarch64-linux-gnu-gcc -nostdlib -ffreestanding -c hello.S -o hello.o
          aarch64-linux-gnu-ld -T hello.ld -nostdlib --no-warn-rwx-segments -o hello.elf hello.o
          chown {{.USER_ID | default "1000"}}:{{.GROUP_ID | default "1000"}} hello.o hello.elf
        '
      - file hello.elf

  inject-hello-payload:
    desc: Bake the hello payload into an existing aarch64 coreboot.rom. Pass ROM=/path/to/coreboot.rom; the rom is patched in place.
    deps: [build-hello-payload]
    requires:
      vars: [ROM]
    cmds:
      - "{{.CBFSTOOL}} {{.ROM}} remove -n fallback/payload 2>/dev/null || true"
      - "{{.CBFSTOOL}} {{.ROM}} add-payload -f {{.HELLO_ELF}} -n fallback/payload -c lzma"
      - "{{.CBFSTOOL}} {{.ROM}} print | grep fallback/payload"

  build-aarch64-rom:
    desc: End-to-end — build the payload, inject it into ROM. Pass ROM=/path/to/coreboot.rom.
    requires:
      vars: [ROM]
    cmds:
      - task: inject-hello-payload
        vars: { ROM: '{{.ROM}}' }