docs: def install_board_with_programmer(mcu,
                                    programmer,
                                    f_cpu=16000000,
                                    core='arduino',
                                    replace_existing=False,
                                    ):
      """install board with programmer."""
      bunch = AutoBunch()
      board_id = '{mcu}_{f_cpu}_{programmer}'.format(f_cpu=f_cpu,
                                               mcu=mcu,
                                               programmer=programmer,
                                               )
      bunch.name = '{mcu}@{f} Prog:{programmer}'.format(f=strfreq(f_cpu),
                                                        mcu=mcu,
                                                        programmer=programmer,
                                                        )
  
      bunch.upload.using = programmer
  
      bunch.build.mcu = mcu
      bunch.build.f_cpu = str(f_cpu) + 'L'
      bunch.build.core = core
  
      install_board(board_id, bunch, replace_existing=replace_existing)