Joakim Gebart eff9338e2a boards/mulle: Add fallback for PORT
Fixes a problem with make buildtest if TARGET=mulle and no USB serial device connected:

    $ make buildtest
    Warning: no PORT set!
    Building for Warning: .. failed
    .../riot/Makefile.include:110: *** The specified board Warning: does not exist..  Stop.
    .../riot/Makefile.include:110: *** The specified board Warning: does not exist..  Stop.
    Building for no (no linking) .. failed
    .../riot/Makefile.include:110: *** The specified board no does not exist..  Stop.
    .../riot/Makefile.include:110: *** The specified board no does not exist..  Stop.
    Building for PORT .. failed
    .../riot/Makefile.include:110: *** The specified board PORT does not exist..  Stop.
    .../riot/Makefile.include:110: *** The specified board PORT does not exist..  Stop.
    Building for set! .. failed
    .../riot/Makefile.include:110: *** The specified board set! does not exist..  Stop.
    .../riot/Makefile.include:110: *** The specified board set! does not exist..  Stop.
    Building for airfy-beacon (no linking) .. ^C
2015-07-10 16:55:54 +02:00
..
2015-05-20 06:19:51 +02:00