FreeCalypso > hg > fc-tourmaline

annotate README @ 272:edd8482a6576

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buzzer driver: set ARMIO_LOAD_TIM to 0 on Pirelli target The Pirelli phone has its vibrator connected to Calypso BU output (no buzzer), and we need to set ARMIO_LOAD_TIM to 0 (instead of a tone frequency divisor for the buzzer) for correct operation of the vibrator.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 13 Jun 2021 18:43:36 +0000
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1 FreeCalypso Tourmaline firmware project
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2 =======================================
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3
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4 In chronological terms, FC Tourmaline is our fourth firmware offering after
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5 Citrine, Magnetite and Selenite. FC Tourmaline supports the following two
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6 fundamental modes of operation:
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7
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8 * AT-command-controlled modem operation (no UI) is currently unchanged from
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9 Magnetite hybrid; standard modem operation is supported on Tango/Caramel2,
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10 FCDEV3B and Openmoko hardware targets.
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11
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12 * The new work being done in Tourmaline is phone handset functionality - the
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13 goal is to produce firmware that can operate a suitable hardware unit as an
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14 untethered end user phone. Only two hardware targets are supported in this
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15 FC Tourmaline handset UI development venture: FC Luna development platform
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16 and Motorola C139.
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17
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18 See the following articles under doc for further details:
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19
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20 C139-notes -- running smallbw version of the UI on Mot C139
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21 Luna-notes -- running both UI versions on FC Luna
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22 Modem-operation -- using the modem configuration
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23
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24 Technical details
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25 =================
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26
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27 Just like FC Selenite, Tourmaline is derived from the hybrid config of
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28 Magnetite. Also in common with Selenite, Tourmaline uses the new source
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29 version of Nucleus. However, unlike Selenite, Tourmaline retains sole use of
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30 the original TMS470 compiler (runs under Wine), retains the original blob
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31 versions of OSL and OSX glue components of GPF in the default config (see
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32 doc/Blob-status), and includes both modem and handset functional configs.
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33
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34 Purpose and goal
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35 ================
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36
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37 As of late 2020, FreeCalypso has achieved everything that needs to be done on
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38 the modem side: our Magnetite hybrid or Tourmaline stdmodem firmware running on
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39 our Tango modem module embodies complete fulfillment of our long-standing desire
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40 for a standard GSM+GPRS modem module with fully published circuit schematics and
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41 firmware source code. No more significant work beyond maintenance is deemed to
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42 be needed on the modem side.
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43
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44 OTOH, the other need for a FreeCalypso handset that can replace proprietary
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45 phones like Mot C1xx or Pirelli DP-L10 running their original proprietary fw
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46 still remains as unmet as it was when we started back in 2013. Thus the new
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47 FreeCalypso work direction is to finally produce this FC handset, initially in
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48 the form of FC firmware running on Mot C139 (and on FC Luna to keep up the
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49 bigcolor config) and allowing the possibility of new FreeCalypso handset hw.
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50
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51 Seen from the perspective of handset rather than modem functionality, the
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52 direction taken in Citrine and Selenite (going for 100% blob-free compilation
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53 with gcc) is the wrong way to go. That direction would make sense if one cared
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54 only about modem functionality rather than handset, but we are currently in the
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55 opposite situation. In the case of handset functionality, going for a compiler
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56 change to gcc in our current state when so many other parts are broken and in
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57 need of fixing would be pure insanity, and we are not going there. Let us
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58 first produce a working FreeCalypso handset (with fw compiled with TMS470 under
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59 Wine, keeping the tiny remaining blobs) that can replace Mot/Pirelli's original
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60 proprietary firmwares for daily use, and *then* think about moving to 100%
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61 blob-free gcc - in this order.