What is the best way to do factory procedure?

Hi All,

Basically, on linux, we use different run levels to identify what need to be done on factory procedure, and we would like to

  1. Boot up as soon as possible without any daemon.
  2. We need to insert all drivers to verify all hardware working.
  3. Store verify result to one partition.

Since openwrt did not have run level, does anyone know a better way which already existed on openwrt framework? Any suggestion is good. Thanks.