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Harald Welte laforge at gnumonks.orgHi 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.
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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