FreeCalypso > hg > fc-magnetite
view doc/FCDEV3B-751774 @ 639:026c98f757a6
tpudrv12.h & targets/gtm900.h: our current support is for MGC2GSMT version only
As it turns out, there exist two different Huawei-made hw platforms both
bearing the marketing name GTM900-B: one is MG01GSMT, the other is MGC2GSMT.
The two are NOT fw-compatible: aside from flash chip differences which
should be handled by autodetection, the two hw platforms are already known
to have different RFFEs with different control signals, and there may be
other differences not yet known. Our current gtm900 build target is for
MGC2GSMT only; we do not yet have a specimen of MG01GSMT on hand, hence
no support for that version will be possible until and unless someone
provides one.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 30 Jan 2020 18:19:01 +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.