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annotate README @ 212:7f3266e247d6

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audio mode load: gracefully handle mode files of wrong AEC version Irrespective of which AEC policy we adopt for FC Selenite (keep L1_NEW_AEC disabled like in Magnetite or enable it like in Tourmaline), we MUST gracefully handle the case of wrong AEC version on audio mode load: disable AEC instead of loading garbage. Therefore, we apply the same change to src/cs/services/audio/audio_mode_load.c as we made in Tourmaline and Magnetite last year.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 31 Oct 2022 00:31:30 +0000
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children
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1 FreeCalypso Selenite is an experimental side branch off the mainline FC
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2 Magnetite firmware. The principal changes from Magnetite are:
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3
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4 * Only modem functionality is supported. FC Magnetite includes TI's C-Sample
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5 and D-Sample demo/prototype UI code and work in progress toward our own
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6 FreeCalypso Libre Dumbphone; this code is not included and this functionality
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7 is explicitly unsupported in Selenite.
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8
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9 * Only the hybrid modem configuration is supported, using the new G23M PS and
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10 ACI code from TCS3.2/LoCosto, not any of the legacy configurations that used
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11 the blob-laden version from TCS211-20070608.
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12
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13 * Only the "new" Calypso+RF chipset is supported, i.e., Calypso C035, DSP ROM
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14 version 36, Rita RF - no support for historical Calypso silicon versions or
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15 older RF chips.
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17 * The old version of Nucleus used in TI's TCS211 program (binary sans source)
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18 has been replaced with FreeNucleus by XVilka. OSL (GPF to Nucleus glue layer)
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19 is the source-reconstructed version.
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21 * The tree layout and the build system are structured in such a way that it is
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22 possible to build either with TI's original TMS470 compiler or with gcc.
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24 The purpose of this Selenite fw experiment is to see what will happen if we
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25 take our full-featured hybrid modem fw as featured in Magnetite and compile it
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26 with gcc instead of TI's original TMS470 compiler, which also implies swapping
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27 in the new version of Nucleus and an entirely different implementation of all
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28 assembly components and linker script magic. The current status is as follows:
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30 * When built with the original TMS470 compiler, the present Selenite fw appears
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31 to perform no worse than Magnetite hybrid.
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33 * It is now possible to compile the full-featured fw with gcc without disabling
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34 GPRS (no more crash on boot), but actually using GPRS doesn't work: pppd
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35 establishes the point-to-point connection to the network's GGSN and gets an
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36 IP address, but then trying to ping through this established connection causes
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37 the fw to crash.
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39 * Voice, SMS and CSD appear to work in the gcc-built version, but this firmware
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40 is not as stable as Magnetite hybrid: I saw some occasional glitches which I
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41 did not investigate further.
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43 Compared to FC Citrine (our previous attempt at gcc-built fw), the present
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44 FC Selenite firmware built with gcc already offers the following:
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46 * CSD support;
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48 * Audio services: playing beeps and melodies through the DSP;
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50 * Newer code: FC Selenite branched off Magnetite in 2018-07 and is being
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51 periodically synced with new Magnetite developments, whereas FC Citrine
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52 has been unmaintained since 2016-10.
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54 Because FC Selenite gcc already does everything that FC Citrine could do and
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55 more, and is no less free, FC Citrine is now officially fully retired.
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57 As the next step, someone needs to do the work of tracking down and debugging
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58 all of the issues seen in the gcc-built version, and make it work as well as
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59 the original TMS470-built configuration. However, I (Mother Mychaela) am not
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60 currently willing to work in that direction until and unless we recover some
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61 original authentic versions of os_???.c and osx.c modules - the reconstructions
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62 from 2014 which are used in the present FC Selenite experimental source tree
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63 (same as Citrine) aren't good enough.