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README: GPRS status update
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Jul 2018 21:24:06 +0000
parents 5280c5f4c5cd
children 6ed76fdb72d5
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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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13 * The old version of Nucleus used in TI's TCS211 program (binary sans source)
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14 has been replaced with FreeNucleus by XVilka. OSL (GPF to Nucleus glue layer)
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15 is the source-reconstructed version.
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17 * The tree layout and the build system are structured in such a way that it is
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18 possible to build either with TI's original TMS470 compiler or with gcc.
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20 The purpose of this Selenite fw experiment is to see what will happen if we
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21 take our full-featured hybrid modem fw as featured in Magnetite and compile it
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22 with gcc instead of TI's original TMS470 compiler, which also implies swapping
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23 in the new version of Nucleus and an entirely different implementation of all
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24 assembly components and linker script magic. The current status is as follows:
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26 * When built with the original TMS470 compiler, the present Selenite fw appears
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27 to perform no worse than Magnetite hybrid.
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29 * It is now possible to compile the full-featured fw with gcc without disabling
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30 GPRS (no more crash on boot), but actually using GPRS doesn't work: pppd
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31 establishes the point-to-point connection to the network's GGSN and gets an
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32 IP address, but the trying to ping through this established connection causes
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33 the fw to crash.
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35 * Voice, SMS and CSD appear to work in the gcc-built version, but this firmware
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36 is not as stable as Magnetite hybrid: I saw some occasional glitches which I
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37 did not investigate further.
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39 Compared to FC Citrine, the present FC Selenite firmware built with gcc offers
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40 the following:
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42 * CSD support;
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44 * Audio services: playing beeps and melodies through the DSP;
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46 * Newer code: FC Selenite branched off Magnetite in 2018-07,
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47 whereas FC Citrine has been unmaintained since 2016-10.
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49 At the present time the Mother has no plans to do any further work on this
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50 experimental gcc-built fw, unless someone comes forth with a strong commercial
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51 interest backed by substantial funding.