4 May
2017
4 May
'17
9:14 a.m.
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.
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
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