Hi Anton,

On Wed, May 03, 2017 at 10:11:30PM +0300, Anton Gorbachev wrote:

If I understood everything correct, osmocombb project consist of all the code for GSM stack L1-L3 functionality but Calypdo DSP code is not Opensource and layer1.bin ask non-opensource DSP module to do execute L1 tasks from ghis list:

Correct. The DSP implements the PHY layer, which is proprietary.

However, as the DSP is ROM code running on a different processor, with different address space, RAM and instruction set, there is no issue in terms of GPL licensing. The GPL-licensed OsmocomBB code simply instructs the other processor to do what's needed.

Of cource we can patch DSP and ask it to do whatever we want, like send raw bursts to the host, but now osmocombb uses mostly DSP firmware written by Texas Instruments, not its own opdnsource.

Correct. We never claimed that the PHY layer (DSP code) was FOSS.

There was once an university project about creating a software PHY compatible with OsmocomBB, but unfortunately (like way too often in academic research) the results were not contributed back as FOSS: http://www.benkeser.com/osmophy.pdf

There are some ideas floating around of doing a new run of this using OsmoTRX as basis, but I don't know if there is any actual progress yet. Vadim should be able to say more about it.