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