options in toplevel "config.omk" file before final "make" invocation.
The choices 'y'/'n' can be specified to enable or disable build
of specified hardware/board support, it would be next line in "config.omk"
-file for [[tscan1]] card for example
+file for [[tscan1|boards/tscan1]] card for example
CONFIG_OC_LINCAN_CARD_tscan1=y