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doc/Pirelli-Howto: update for the current situation
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Sat, 23 Apr 2016 06:19:09 +0000
parents 7d3f0910aeb2
children
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8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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1 About the Pirelli DP-L10 target
8b52011dc66a doc/Pirelli-Howto: update for the current situation
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parents: 998
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2 ===============================
8b52011dc66a doc/Pirelli-Howto: update for the current situation
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parents: 998
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3
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parents: 998
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4 The Pirelli target is currently seen as a dead end for future FreeCalypso
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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5 development. The hardware is very attractive from an end user's perspective
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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6 (nice LCD, hands-free loudspeaker, USB port that combines charging with serial
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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7 data access by way of a built-in CP2102), thus we had high hopes for a long
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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8 time of being able to turn these Pirellis into libre phones by putting our own
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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9 aftermarket firmware on them. However, the following serious problems make
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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10 this prospect less and less likely:
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parents: 998
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11
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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12 * The inexplicable behaviour around deep sleep will probably be a show-stopper
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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13 to any attempts at on-board UI integration. Experiments revealed that even
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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14 when running TCS211 fw with deep sleep that works on other targets, deep sleep
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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15 must be disabled on the Pirelli, otherwise the phone spontaneously reboots.
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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16 Obviously Pirelli's own fw does something to avoid this problem, as it uses
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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17 deep sleep just fine, but we don't have any source for their fw, hence it
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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18 doesn't help. However, if one disables deep sleep at compile time (in
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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19 cst_pei.c), then something else breaks - the DSP fails in non-understood ways
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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20 when trying to find a GSM network to connect to. So it's a "damned if you do,
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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21 damned if you don't" situation with deep sleep on the Pirelli target. The
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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22 only approach that works is to build the fw with deep sleep enabled at compile
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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23 time, but then disable it with AT%SLEEP=2 before issuing AT+COPS=0. This
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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24 method is tolerable for manual AT command operation, but I have very little
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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25 confidence in being able to make it work with phone UI integration.
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26
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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27 * We never attempted to play at all with Pirelli's Winbond W56940 MIDI player
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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28 and loudspeaker driver chip. Even if one is willing to sacrifice the hands-
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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29 free loudspeaker function (which is one of the main attractions of the Pirelli
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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30 over Mot C139), the loudspeaker is still needed in order to play ringtones -
8b52011dc66a doc/Pirelli-Howto: update for the current situation
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parents: 998
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31 a phone that can't ring won't be very useful. Whether we want to play MIDI
8b52011dc66a doc/Pirelli-Howto: update for the current situation
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parents: 998
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32 ringtones through the W56940 itself or put that chip into the same analog
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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33 pass-through mode in which Pirelli's own fw must put it for loudspeaker calls
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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34 and play Melody E1/E2 ringtones through the Calypso DSP, either way some
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35 programming of the W56940 will almost certainly be required. When I tried to
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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36 trace out the PCB connections to this chip, a red flag was raised: its reset
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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37 line appears to be driven by what seems to be a GPIO off the SPCA552E camera
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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38 chip. There are no docs for the latter, hence it is not clear if we'll be
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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39 able to control the reset line to the W56940, and without it we may be out of
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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40 luck as far as emitting a ringtone from the loudspeaker.
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41
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42 * There is a lot of complex and unwanted (from our perspective) hardware in the
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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43 Pirelli DP-L10 dealing with its non-GSM functions (WLAN and camera); this
8b52011dc66a doc/Pirelli-Howto: update for the current situation
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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44 hardware is completely undocumented and there are no schematics for the phone.
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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45 Trying to build a libre phone atop of an undocumented and poorly understood
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents: 998
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46 hardware platform which just happens to include one familiar component (the
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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47 Calypso GSM chipset) would be building a house on quicksand.
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48
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49 All of the above notwithstanding, a lot of work has already been put in toward
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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50 support for the Pirelli target in FreeCalypso, and the AT-command-controlled
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51 voice+SMS pseudo-modem functionality of our current gcc-built GSM firmware
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
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52 works no worse on the Pirelli than it does on Mot C1xx. Therefore, we shall
8b52011dc66a doc/Pirelli-Howto: update for the current situation
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53 proceed with the howto:
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54
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55 How to play with FreeCalypso GSM firmware on a Pirelli DP-L10
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56 =============================================================
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57
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58 One very useful special feature of the Pirelli DP-L10 is its very large RAM:
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59 8 MiB. Having such large RAM allows us to run our experimental fw on this
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60 target entirely from RAM, without touching the flash. When you compile a
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Space Falcon <falcon@ivan.Harhan.ORG>
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61 FreeCalypso gsm-fw image for the Pirelli target, by default a ramImage will be
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62 built instead of a flashImage. It is possible to build a flashable image of
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63 the fw in the same configuration and program it into flash with fc-loadtool,
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64 but doing so is not recommended: our current fw has no battery management code,
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65 so the charging hardware circuit will never be enabled and the battery will
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66 discharge even with a USB power source connected; keeping Pirelli's original
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Space Falcon <falcon@ivan.Harhan.ORG>
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67 fw in flash will allow the phone to charge its battery and otherwise function
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68 normally when you are not in the middle of a FreeCalypso firmware experiment.
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69
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70 If you are ready to play with our experimental GSM pseudo-modem fw on your
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71 Pirelli, the steps are as follows:
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72
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73 1. Build the firmware in the pirelli-gsm-rvtat configuration - see the
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74 Compiling document for more details.
896
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75
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76 2. Connect a USB cable from your GNU/Linux PC/laptop to the phone. If the
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Space Falcon <falcon@ivan.Harhan.ORG>
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77 phone was off but the battery is present, it will go through a charger-plug
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Space Falcon <falcon@ivan.Harhan.ORG>
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78 power-on event; if the flash contains Pirelli's original fw, it will boot in
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Space Falcon <falcon@ivan.Harhan.ORG>
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79 the charging mode. If the battery is not present, the Calypso won't power
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Space Falcon <falcon@ivan.Harhan.ORG>
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80 on (it needs VBAT and can't run on VCHG power instead), but the /dev/ttyUSBx
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81 device will still show up, as the CP2102 USB-serial chip inside the phone is
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Space Falcon <falcon@ivan.Harhan.ORG>
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82 powered strictly from the USB side.
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83
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84 3. Run a command like the following:
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85
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86 fc-xram -h pirelli /dev/ttyUSB0 finlink/ramImage.srec rvinterf
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87
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88 Adjust the paths to your /dev/ttyUSBx device and your ramImage.srec as
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Space Falcon <falcon@ivan.Harhan.ORG>
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89 appropriate, and add rvinterf logging or other options as desired.
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90 Specifying rvinterf on the fc-xram command line directs fc-xram to exec
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91 rvinterf and pass the serial channel to it immediately as soon as the code
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92 image has been loaded into target RAM and jumped to; this direct passing of
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93 the serial channel from fc-xram to rvinterf is appropriate because the
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Space Falcon <falcon@ivan.Harhan.ORG>
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94 loaded fw will immediately start emitting binary trace packets in TI's RVTMUX
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Space Falcon <falcon@ivan.Harhan.ORG>
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95 format.
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96
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97 4. Induce the phone to execute its Calypso boot path: if the battery was
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98 removed, insert it now; if Pirelli's regular fw is running, execute its
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Space Falcon <falcon@ivan.Harhan.ORG>
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99 power-off sequence.
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Space Falcon <falcon@ivan.Harhan.ORG>
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100
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101 Once the Calypso chip in the Pirelli phone executes its boot path with fc-xram
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Space Falcon <falcon@ivan.Harhan.ORG>
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102 running, the boot path will be diverted and our experimental firmware will be
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Space Falcon <falcon@ivan.Harhan.ORG>
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103 loaded into target device RAM and jumped to. Our fw will now run, and the
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Space Falcon <falcon@ivan.Harhan.ORG>
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104 rvinterf process on the host will maintain communication with it.
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105
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106 To exercise our firmware further, you will need to open another terminal window
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107 on your driving PC/laptop and run fc-shell. This program will connect to the
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108 already running rvinterf process via a local socket, and it will enable you to
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Space Falcon <falcon@ivan.Harhan.ORG>
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109 send various commands to the running fw on the target, the most important ones
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Space Falcon <falcon@ivan.Harhan.ORG>
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110 being standard AT commands. Send the following sequence of AT commands to
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Space Falcon <falcon@ivan.Harhan.ORG>
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111 bring up GSM functionality:
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112
1021
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113 AT%SLEEP=2 -- disable deep sleep (always required on the Pirelli)
896
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114 AT+CMEE=2 -- enable verbose error responses
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115 AT+CFUN=1 -- enable radio and SIM interfaces
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116 AT+COPS=0 -- register to the default GSM network
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117
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118 When you are done playing with our experimental fw, you can either yank the
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119 battery and kill the host side rvinterf and fc-shell processes, or you can
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120 issue a 'tgtreset' command at the fc-shell prompt. The latter will cause the
7c5b129573f6 doc/Pirelli-Howto written
Space Falcon <falcon@ivan.Harhan.ORG>
parents:
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121 target to reset and boot back into its regular firmware.