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README: update for the outcome of the gcc experiment
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 21 Jul 2018 07:26:47 +0000
parents 1e575681e595
children af6b7fcf7823
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5280c5f4c5cd README: update for the outcome of the gcc experiment
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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 * 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 a such 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 * The gcc-built version with GPRS enabled is broken - crashes on boot. The bug
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30 has not been tracked down yet.
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32 * With GPRS disabled (GPRS=0 on the ./configure-gcc.sh line), Selenite gcc
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33 boots without crashing and appears to work: I was able to connect to a GSM
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34 network and make both voice and CSD calls. However, this gcc-built fw is not
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35 as stable as Magnetite hybrid: I saw some occasional glitches which I did not
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36 investigate further.
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38 Compared to FC Citrine, the gcc-built version of FC Selenite with GPRS disabled
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39 offers the following:
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40
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41 * CSD support;
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42
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43 * Audio services: playing beeps and melodies through the DSP;
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45 * Newer code: FC Selenite branched off Magnetite in 2018-07,
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46 whereas FC Citrine has been unmaintained since 2016-10.
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47
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48 At the present time the Mother has no plans to do any further work on this
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49 experimental gcc-built fw, unless someone comes forth with a strong commercial
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50 interest backed by substantial funding.