FreeCalypso > hg > fc-magnetite
view doc/FCDEV3B-751774 @ 685:3fb7384e820d
tpudrv12.h: FCDEV3B goes back to being itself
A while back we had the idea of a FreeCalypso modem family whereby our
current fcdev3b target would some day morph into fcmodem, with multiple
FC modem family products, potentially either triband or quadband, being
firmware-compatible with each other and with our original FCDEV3B. But
in light of the discovery of Tango modules that earlier idea is now being
withdrawn: instead the already existing Tango hw is being adopted into
our FreeCalypso family.
Tango cannot be firmware-compatible with triband OM/FCDEV3B targets
because the original quadband RFFE on Tango modules is wired in TI's
original Leonardo arrangement. Because this Leonardo/Tango way is now
becoming the official FreeCalypso way of driving quadband RFFEs thanks
to the adoption of Tango into our FC family, our earlier idea of
extending FIC's triband RFFE control signals with TSPACT5 no longer makes
much sense - we will probably never produce any new hardware with that
once-proposed arrangement. Therefore, that triband-or-quadband FCFAM
provision is being removed from the code base, and FCDEV3B goes back to
being treated the same way as CONFIG_TARGET_GTAMODEM for RFFE control
purposes.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 24 Sep 2020 21:03:08 +0000 |
| parents | 9f19cc5e46e8 |
| children |
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We have one experimental FCDEV3B V2 board on which our regular Calypso chip ([P]D751992AGHH) has been replaced with D751774AGHH, an earlier F-number featuring DSP ROM version 3416 rather than the final version 3606 which we normally work with. Both chip versions are Calypso C035 variants (ARM7 running at 52 MHz, DSP running at 104 MHz), and both include AMR support - but there must have been some issue with DSP version 34 (and maybe version 35 used in Calypso+) that compelled TI to produce the newer and final version 36 which we are most familiar with. Our Layer1 code is based on TI's TCS211-20070608 semi-src release (which we have reconstructed back to full source), and it officially supports only DSP 36. However, our FC Magnetite firmware can also be built for DSP 34 targets (see the Calypso-version-override article), in which case we use a monolithic DSP patch (no L1_DYN_DSP_DWNLD) extracted from the TSM30 source. The patch version is 4130. The configure.sh target name for this special modified board is fcdev3b-dsp34 instead of just fcdev3b, and the two firmware builds are not interchangeable: the regular fcdev3b build goes into regular FCDEV3B boards, the special fcdev3b-dsp34 build goes into the special FCDEV3B-751774 board. However, when running its respective build this DSP 34 board appears to function just as well as our regular DSP 36 targets: standalone RF tests work, DSP-based audio services (beeps and Melody E1) work, connecting to a live GSM network worked, a few test voice calls worked, all of them connected in AMR mode, voice passed successfully in both directions. Going forward, we shall continue using D751992AGHH chips with DSP ROM version 3606 as our regular platform, but it is nice to know that the earlier DSP 34 apparently works too.