====== Tips ======

  * [[https://stackoverflow.com/questions/51002891/overwriting-yocto-classes-through-meta-layer|Overwriting Yocto Classes through meta-layer]]

===== override .conf =====

No override or appends mechanism. But some workaround possible:
  - override variables in ''local.conf''
  - create new conf file and inherit old one with ''require''
  - create new conf file with the same name to mask old file (take care of layer priority)


===== MACHINEOVERRIDES =====

When creatung new machine.conf based on existing one [[https://docs.yoctoproject.org/ref-manual/variables.html?highlight=machineoverrides#term-MACHINEOVERRIDES|MACHINEOVERRIDES]] can be used:



[[https://github.com/Freescale/meta-freescale/blob/master/classes/machine-overrides-extender.bbclass|machine-overrides-extender.bbclass]]

===== logging =====

<code bash>
inherit logging

bb.debug("HELLO = %s" % HELLO)
</code>