Hi, Nuttx is BSD licensed while osmocom-bb's src/target/firmware is GPLv2(or later). Mixing GPlv2 and BSD code is legally possible. As I understand it the whole work becomes GPLv2 when the code is mixed, the BSD part however can be used independently of the GPL part if you strip out the GPL part and the BSD copyright headers have to remain intact. The problem is that upstream(nuttx) will unlikely accept GPL code as-is for inclusion in nuttx. However there is a misc directory for software made under different licenses such as applications or drivers(there is one GPL driver for the rtl8187x wifi chipsets). To use the driver the user is expected to run a script that install the driver in nuttx normal source code directory. The list of files touched by the patches mades on top of nuttx and their licenses is listed here: http://bb.osmocom.org/trac/wiki/nuttx-bb/code-audit Basically the GPL parts are composed by : * the irq * the timer * the clock * the uart some of the related files have the following authors(can be combined together): * Harald Welte * Stefan Richter * Ingo Albrecht I guess Stefan Richter and Ingo Albrecht will be hard to reach. So I wonder what's the best thing to do. Denis.