annotate 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 But in light of the discovery of Tango modules that earlier idea is now being withdrawn: instead the already existing Tango hw is being adopted into our FreeCalypso family.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
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1 We have one experimental FCDEV3B V2 board on which our regular Calypso chip
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2 ([P]D751992AGHH) has been replaced with D751774AGHH, an earlier F-number
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3 featuring DSP ROM version 3416 rather than the final version 3606 which we
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4 normally work with. Both chip versions are Calypso C035 variants (ARM7 running
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5 at 52 MHz, DSP running at 104 MHz), and both include AMR support - but there
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6 must have been some issue with DSP version 34 (and maybe version 35 used in
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7 Calypso+) that compelled TI to produce the newer and final version 36 which we
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8 are most familiar with.
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9
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10 Our Layer1 code is based on TI's TCS211-20070608 semi-src release (which we have
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11 reconstructed back to full source), and it officially supports only DSP 36.
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12 However, our FC Magnetite firmware can also be built for DSP 34 targets (see
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13 the Calypso-version-override article), in which case we use a monolithic DSP
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14 patch (no L1_DYN_DSP_DWNLD) extracted from the TSM30 source. The patch version
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15 is 4130.
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16
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17 The configure.sh target name for this special modified board is fcdev3b-dsp34
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18 instead of just fcdev3b, and the two firmware builds are not interchangeable:
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19 the regular fcdev3b build goes into regular FCDEV3B boards, the special
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20 fcdev3b-dsp34 build goes into the special FCDEV3B-751774 board. However, when
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21 running its respective build this DSP 34 board appears to function just as well
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22 as our regular DSP 36 targets: standalone RF tests work, DSP-based audio
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23 services (beeps and Melody E1) work, connecting to a live GSM network worked,
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24 a few test voice calls worked, all of them connected in AMR mode, voice passed
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25 successfully in both directions.
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26
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27 Going forward, we shall continue using D751992AGHH chips with DSP ROM version
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28 3606 as our regular platform, but it is nice to know that the earlier DSP 34
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29 apparently works too.