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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents 5ab737ac3ad7
children
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1 The goal of the gcc-built Calypso GSM firmware project contained in the gsm-fw
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2 directory of this source tree is to replace the Windows-built firmwares which
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3 have been produced in other subprojects under the FreeCalypso umbrella - see
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4 leo2moko and tcs211-c139. Our leo2moko project has produced a production
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5 quality modem fw image for the Openmoko GTA02, while a C139 reflashed with
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6 tcs211-c139 is the first dumbphone in history that can still function as an
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7 untethered phone after having had its fw replaced with an indie one that bears
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8 no relation to the manufacturer's original - but those TCS211-based
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9 Windows-built projects have severe limitations. Much of the firmware code base
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10 in those versions is in the form of unmodifiable binary object libraries, and
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11 the Windows-based configuration and build system is incompatible with the
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12 long-term needs of FreeCalypso development.
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13
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14 The present FreeCalypso GSM fw project seeks to rectify the situation by
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15 replacing the blob-laden, Windows-built firmware with a version that is built
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16 from full source (no binary blobs) with gcc, with an entirely different
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17 configuration mechanism that actually suits our needs. Because one of the key
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18 goals of this project is to build the firmware from *full source*, the binary
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19 object versions of L1 (GSM Layer 1) and G23M (layers 2&3 of the protocol stack)
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20 featured in our reference TCS211 fw could not be reused. Instead this project
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21 uses versions of L1 and G23M (and some other pieces) that have been lifted from
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22 the firmware for TI's other chipset (LoCosto) and backported to Calypso.
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23
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24 The current state of the project is that we have made remarkable progress, but
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25 what we have right now is still not a satisfactory replacement for TCS211.
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26 Specifically:
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28 * Only the bare minimal modem functionality for the voice+SMS subset has been
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29 integrated so far. "Modem" means our fw can only be controlled via AT
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30 commands; no UI code (as in LCD+keypad) has been integrated at all. But it
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31 is not a true modem either as none of the data functions have been integrated
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32 yet: no CSD, no fax, no GPRS. Thus it is an AT-command-controlled voice+SMS
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33 pseudo-modem.
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34
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35 * The firmware can be built for the following targets:
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37 Mot C11x/12x
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38 Mot C139/140
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39 Mot C155/156
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40 Openmoko GTA01/02
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41 Pirelli DP-L10
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42
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43 All configurations are built from the same source tree. The firmware
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44 functions identically on all supported targets. Because there is no UI code
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45 integrated yet, the LCD stays dark and the buttons do nothing on those target
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46 devices that have such hardware.
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47
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48 * Most of our supported target devices have only one practically accessible
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49 serial port (UART). Our firmware presents TI's RVTMUX interface on this
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50 UART; the operator is expected to interface to it by running our rvinterf
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51 tools on the host PC/laptop. One of the utilities in the rvinterf suite is
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52 fc-shell; this tool is used to send AT commands to the running firmware,
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53 which is the only way to control its operation.
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54
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55 * With a valid SIM card inserted and a valid IMEISV configured, a GSM device
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56 running our firmware can successfully connect to live commercial GSM networks,
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57 make and receive voice calls, and send and receive SMS.
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58
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59 * Voice calls work correctly only when the original FR codec is used; EFR and
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60 AMR are broken. Our current workaround is that we advertise to the network
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61 that we only support the original FR codec; if we tell the network that we
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62 support EFR and/or AMR and the network selects one of these codecs, the
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63 result will be either a total DSP failure (the Calypso DSP blows up with
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64 errors, the call fails, and the phone is messed up until reboot) or a
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65 seemingly successful call with broken audio: nothing but noise is heard in
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66 the earpiece speaker.
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67
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68 We reason that the problem must be somewhere in L1, which has been backported
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69 from LoCosto to Calypso in a rather Frankensteinian manner.
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70
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71 * When voice calls do work successfully (when the FR codec is used), the call
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72 downlink audio is routed to the phone's earpiece speaker and the phone's
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73 microphone serves as the source for the uplink audio, i.e., even though the
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74 LCD and keypad are dead with our firmware, the earpiece and mic continue to
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75 function as in a conventional phone.
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76
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77 There is also a highly experimental and minimally tested alternative mode
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78 of operation in which the traffic channel carrying FR codec bits (260 bits
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79 every 20 ms) is rerouted away from the internal vocoder to the external host,
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80 such that you can receive the downlink voice bits digitally instead of
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81 listening to them in the earpiece speaker, and you can substitute your own
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82 uplink bits instead of the microphone-fed internal vocoder output. See the
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83 TCH-special-feature write-up for more information.
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84
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85 * Deep sleep is broken and needs to be disabled with AT%SLEEP=2; the breakage
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86 is likewise assumed to be somewhere in L1.
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87
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88 The plan for further development is as follows:
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89
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90 * Our current problems with deep sleep and with the more advanced voice codecs
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91 are indicative of breakage in L1. Furthermore, these are merely visible
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92 symptoms, and there may be other, more subtle breakage which we haven't
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93 noticed yet. Because one of the key goals of this project is to produce a
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94 full-source, gcc-built firmware version that is no worse than TCS211, we need
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95 an L1 that functions no worse than in TCS211.
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96
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97 In order to obtain this TCS211-matching L1, we are taking a little detour
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98 from the present gcc-built gsm-fw line of development and temporarily going
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99 back into the Windows build environment of TCS211 in order to reconstruct a
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100 recompilable TCS211 L1 source in its native environment. You can follow the
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101 progress of that project in the tcs211-l1-reconst Hg repository on Bitbucket.
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102 When we get the TCS211 version of L1 fully reconstructed in its native
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103 environment, we are going to make a wholesale replacement of L1 in our
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104 gcc-built gsm-fw: completely remove the current version and replace it with
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105 the reconstructed TCS211 one. This step should fix the deep sleep and
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106 advanced voice codec breakage, and give us a more solid foundation that will
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107 be no worse than our TCS211 golden reference.
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108
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109 * Once we have an L1 which we feel happy with, we will need to fix a few minor
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110 issues and implement two major missing features for the AT-command-controlled
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111 voice+SMS pseudo-modem configuration: battery charging (the ability to charge
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112 the battery while our pseudo-modem fw is running) and a keepalive mechanism
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113 that detects when the external host (connected via the serial port) has been
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114 disconnected and powers off the phone-turned-pseudo-modem in this case. Once
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115 these two features are implemented, we will have a robust voice+SMS pseudo-
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116 modem solution with external AT command control.
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117
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118 * Once we reach the robust AT-command-controlled voice+SMS pseudo-modem
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119 milestone, we will have several different directions in which we can develop
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120 the project further. It is too early and premature right now to plan that
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121 far ahead, though.
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122
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123 Target-specific usage instructions
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124 ==================================
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125
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126 If you would like to play with our work-in-progress firmware and check it out
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127 for yourself, see the following target-specific instructions:
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128
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129 Mot C1xx (Compal) FC-on-Compal
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130 Openmoko GTA01/02 Freerunner-Howto
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131 Pirelli DP-L10 Pirelli-Howto