drivers/sercomm README ====================== If CONFIG_SERCOMM_CONSOLE is defined in the NuttX configuration file, NuttX will attempt to use sercomm (HDLC protocol) to communicate with the host system. Sercomm is the transport used by osmocom-bb that runs on top of serial. See http://bb.osmocom.org/trac/wiki/nuttx-bb/run for detailed the usage of nuttx with sercomm. The drivers/sercomm build that you have the osmocom-bb project directory at same level as the nuttx project: |- nuttx |- apps `- osmocom-bb If you attempt to build this driver without osmocom-bb, you will get compilation errors because ofheader files that are needed from the osmocom-bb directory.