bootloader_config = meson.current_source_dir() / 'bootloader.conf'

external_project = import('unstable-external_project')
bootloader_bin = meson.current_build_dir() / 'zephyr' / 'zephyr.bin'
bootloader_project = external_project.add_project('configure.sh',
  configure_options: [
    bootloader_firmware,
    meson.current_build_dir() / 'build',
    board,
    zephyr,
    ';'.join(zephyr_modules),
    bootloader_config,
    signing_key,
  ],
  verbose: true,
)