annotate doc/FCDEV3B-751774 @ 688:5806383e2788

doc/Compiling: update for luna1, luna2 and tangomdm
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 12 Oct 2020 19:17:23 +0000
parents 9f19cc5e46e8
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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.