FreeCalypso > hg > fc-tourmaline

annotate README @ 268:f2e52cab0a73

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abb_inth.c: check all interrupt causes, not just one The original code used if - else if - else if etc constructs, thus the first detected interrupt was the only one handled. However, Iota ITSTATREG is a clear-on-read register, thus if we only handle the first detected interrupt and skip checking the others, then the other interrupts will be lost, if more than one interrupt happened to occur in one ABB interrupt handling cycle - a form of rare race condition. Change the code to check all interrupts that were read in this cycle.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 13 Jun 2021 18:17:53 +0000
parents a62e5bf88434
children
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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.