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annotate README @ 149:bd1301884216

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l1_small.c: BIG_SMALL_SLEEP support like in Magnetite
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 06 Feb 2019 23:21:43 +0000
parents ee67197fd2e5
children 9b49f18d3221
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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 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 then 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 (our previous attempt at gcc-built fw), the present
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40 FC Selenite firmware built with gcc already offers 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 and is being
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47 periodically synced with new Magnetite developments, whereas FC Citrine
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48 has been unmaintained since 2016-10.
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50 Because FC Selenite gcc already does everything that FC Citrine could do and
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51 more, and is no less free, FC Citrine is now officially fully retired.
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53 As the next step, someone needs to do the work of tracking down and debugging
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54 all of the issues seen in the gcc-built version, and make it work as well as
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55 the original TMS470-built configuration. However, I (Mother Mychaela) am not
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56 currently allocating my time toward that work because I see other directions
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57 within the greater FreeCalypso family of projects as being more important.
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58 Specifically, I see the following as much higher priorities compared to
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59 gcc-built firmware:
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61 * Getting our FCDEV3B V2 boards made to prove my proposed fix for the sleep
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62 mode bug, and if they work as expected, we'll need to make more FreeCalypso
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63 modem hw in various form factors and put that hw into the hands of end users.
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64 Software or firmware without hardware to run it on is useless no matter how
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65 good or how free/libre it is, hence it makes no sense to me to worry whether
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66 our fw is built with gcc or with TI's TMS470 compiler until the hardware
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67 that's needed to run it is made in greater volume and placed into the hands
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68 of people who would appreciate it.
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70 * Getting the digital voice channel over MCSI working, which is a prerequisite
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71 before we can repackage our FreeCalypso modem into a module form factor which
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72 could then be marketed to communities like Neo900 and Librem 5 as a drop-in
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73 replacement for the 100% closed and proprietary modem modules they use
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74 currently.
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75
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76 * Building our long-planned FreeCalypso Libre Dumbphone hardware, so we can
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77 have a complete phone without needing someone else like Neo900 or Librem 5 or
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78 ZeroPhone to provide an application processor front-end to our modem.
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80 Anyone else who feels that whipping the gcc-built fw version into shape should
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81 be a higher priority has two options: either do the work themselves (the code
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82 is free for everyone), or pay Falconia Partners LLC to elevate the priority of
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83 this gcc-built fw work.