FreeCalypso > hg > fc-magnetite

annotate README @ 662:8cd8fd15a095

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SIM speed enhancement re-enabled and made configurable TI's original code supported SIM speed enhancement, but Openmoko had it disabled, and OM's disabling of speed enhancement somehow caused certain SIM cards to start working which didn't work before (OM's bug #666). Because our FC community is much smaller in year 2020 than OM's community was in their day, we are not able to find one of those #666-affected SIMs, thus the real issue they had encountered remains elusive. Thus our solution is to re-enable SIM speed enhancement and simply wait for if and when someone runs into a #666-affected SIM once again. We provide a SIM_allow_speed_enhancement global variable that allows SIM speed enhancement to be enabled or disabled per session, and an /etc/SIM_spenh file in FFS that allows it to enabled or disabled on a non-volatile basis. SIM speed enhancement is now enabled by default.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 24 May 2020 05:02:28 +0000
parents c32c887ced3a
children
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1 FreeCalypso Magnetite firmware project
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2 ======================================
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3
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4 As of A.D. 2018, FC Magnetite is the primary official Calypso firmware source
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5 tree for the FreeCalypso family of projects. This maintained and evolving
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6 source can be built in many different configurations for several different
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7 hardware targets, and is currently used in the following ways:
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8
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9 * The official production firmwares for our fully supported GSM+GPRS modem
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10 products (FCDEV3B and the modem part of Openmoko devices) are built from
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11 this source tree. See doc/Modem-configs for this mode of usage.
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12
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13 * The work in progress toward a future complete FreeCalypso phone handset
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14 (also known as a Libre Dumbphone) is being done in this source tree.
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15 See doc/Handset-goal for more info about this project direction.
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16
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17 * One can play with FreeCalypso and get a taste for it using certain hardware
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18 that used to be readily available and which most people in the phone hacking
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19 scene already have: Motorola C1xx and Pirelli DP-L10. Firmware images of the
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20 "hacking toy" sort can be built for these devices from the present source
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21 tree, and one can exercise most of the functions and capabilities of
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22 FreeCalypso (with the notable exception of CSD and GPRS) on this historical
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23 but available-to-most-people hardware. See doc/C1xx-Howto, doc/Pirelli-Howto
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24 and doc/Voice-pseudo-modem for more information.
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26 * If anyone besides the Mother has an original TI-made D-Sample hardware kit
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27 for Calypso software development, we are doing the best we can to support
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28 running our FreeCalypso firmware on this original TI hardware - see
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29 doc/D-Sample for more information.
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30
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31 Functionality
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32 =============
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33
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34 TI's GSM mobile station firmware architecture supports two ways in which the
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35 GSM device may be controlled: via AT commands from an external host and/or via
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36 a local UI on devices with LCD & keypad hardware. (I said "and/or" because the
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37 two mechanisms can coexist.) The code we got from TI (TCS211 and TCS3.2) is
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38 very solid and mature in the modem configuration (control via AT commands only,
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39 no UI, no battery management, no traditional handset on/off control), but the
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40 additional code layers that are needed for handset products but not for modems
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41 came in a very rough "proof of concept" condition, nowhere close to a usable
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42 product.
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43
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44 In FC Magnetite we further maintain and support the solid code base we got for
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45 the modem functionality, and we are also working to improve the support for
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46 handset products and bring it into a practically usable state. At the present
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47 time the handset firmware work is on hold, paused until we design and build the
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48 first prototype version of our own FreeCalypso handset hardware. The reason
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49 for this hold is that we are not able to use TI's original development board
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50 (see doc/D-Sample for the issues), hence we need to build our own hardware that
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51 will serve in its place. Until then we focus on maintaining and supporting the
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52 good working modem functionality.
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54 Both TI's original modem fw (TCS211) and our recreation thereof in this
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55 Magnetite project support not only voice calls and SMS, but also CSD, fax and
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56 GPRS. This advanced functionality is fully supported on our own GSM MS
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57 development board (FCDEV3B), where both Calypso UARTs are presented directly to
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58 the developer, as well as on the embedded Calypso modem in Openmoko GTA01/02
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59 smartphones, where the AT command channel with CSD, fax and GPRS capabilities
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60 is connected to the phone's application processor.
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62 Build system
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63 ============
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64
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65 Even though FC Magnetite is essentially unchanged TCS211 code base and builds
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66 using TI's proprietary TMS470 compiler under Wine, the build system is entirely
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67 new. TI's TCS211 build system, called BuSyB, works by way of a Java tool
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68 generating a customized makefile for each desired build configuration, based on
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69 lots of magic contained in a big repository of XML files. There are a bunch of
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70 Perl scripts involved as well. The Java tool that does the heavy lifting exists
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71 only as compiled Java bytecode sans source, and the surrounding Perl scripts
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72 aren't very understandable either. And the whole thing thoroughly assumes a
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73 Windows environment (drive letters, backslashes, case-insensitive file system)
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74 throughout. As a result, when working with TCS211 fw with its original build
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75 system, we had to treat these BuSyB-generated makefiles almost as being blobs in
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76 themselves: regenerating a makefile from XML magic required major effort, there
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77 were some bugs in the makefile generation which we couldn't fix and thus we had
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78 to edit the makefiles manually after each regeneration - it was an utter mess,
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79 and absolutely not an acceptable way to build a forward-looking, community-
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80 serving project.
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81
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82 In FC Magnetite I have recreated the relevant parts of the TCS211 build system,
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83 using Bourne shell magic instead of Java and XML. Just like TI's BuSyB, ours
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84 is a makefile generation system: in order to compile the firmware in a
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85 particular desired configuration, you run a shell script to select the config
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86 you would like. This shell script will create a dedicated build directory tree
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87 to fully contain this build, and populate it with generated Makefiles and some
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88 other bits - then you go into the just-created build directory and run make
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89 there. The source and build trees are thus cleanly separated. See
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90 doc/Compiling for detailed instructions.
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91
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92 Another key difference from our previous TCS211-based firmware offerings is that
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93 even though we still have to run TI's compiler binaries under Wine, the Wine
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94 invokation has been moved from the top (root) of the build process to the
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95 bottom leaves. With our previous TCS211-based works you would run Wine at the
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96 top, and then the entire build process would proceed in the Windows environment,
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97 using Windows versions of make and other nonsense. Not so in FC Magnetite:
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98 in this firmware project all shell scripts, Makefiles, Perl scripts and other
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99 build system accessories run at the native Unix level, and Wine is only invoked
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100 at the lowest level by individual tool wrappers: for example, TI's compiler
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101 binary cl470.exe is encapsulated in a Unix shell script called cl470 that
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102 invokes Wine to run the Windows binary, presenting the illusion of a native
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103 Unix tool to all upper levels.
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104
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105 As yet another defenestration measure, all source files are checked into this
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106 tree with Unix line endings.
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107
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108 Two versions of the G23M protocol stack
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109 =======================================
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110
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111 A major component of all functional firmware configurations is the mass of code
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112 that implements layers 2 and 3 of the GSM+GPRS protocol stack, called G23M. In
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113 FC Magnetite we have the option of using one of two different versions of this
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114 key firmware component:
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115
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116 * The original G23M version from Openmoko: this version is believed to be very
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117 stable because it has been used (successfully to the best of our knowledge)
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118 by Openmoko, and it came from TI's TCS211 program that officially targeted
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119 the Calypso chipset - but it exists only as binary object libraries with no
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120 corresponding source. The lack of source means no ability to change the
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121 feature configuration (what is enabled and what is disabled), very difficult
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122 to debug if something does go wrong - all of the usual problems of software
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123 without source.
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124
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125 * A newer version from TI's TCS3/LoCosto program. This version came to us in
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126 the form of full C source, and because this fw component is chipset-
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127 independent (unlike L1), we have successfully produced a TCS2/TCS3 hybrid in
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128 which the new G23M code from TCS3.2 is grafted onto the chipsetsw foundation
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129 from TCS211, which we have reconstructed into full C source form as well.
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130
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131 Each of the two G23M PS versions also has its own version of the Application
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132 Control Interface (ACI) layer to go with it, which we call aci2 and aci3 -
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133 except that in the case of ACI, we have the full source for both versions.
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134 Furthermore, in the case of firmware builds that have the phone UI layers
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135 enabled (BMI and MFW, sitting on top of ACI), we likewise have different TCS2
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136 and TCS3 versions of these BMI and MFW layers, also with full source for both
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137 versions. Thus the chipsetsw foundation is always the same TCS211, but then we
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138 bifurcate: we can build either a pure TCS211 config using TCS211 versions of
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139 G23M PS (blobs), ACI (source) and MFW+BMI (source), or a TCS2/TCS3 hybrid config
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140 using the new TCS3 versions of G23M PS, ACI and MFW+BMI, all in full C source
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141 form.
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142
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143 The new TCS2/TCS3 hybrid config is the way forward, as our goal is to have no
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144 blobs in our firmware - having the full source is a prerequisite for maintaining
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145 a software product. FC Magnetite supports building both configurations in order
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146 to facilitate the transition. As of this writing, the hybrid config is believed
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147 to have reached feature parity with Openmoko-mimicking classic and l1reconst
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148 configs, i.e., unless we missed or broke something, every feature that worked
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149 correctly on Openmoko's original modem should work just as well with our hybrid
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150 firmware. All functionality (both standard and OM-custom) that can be tested
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151 in our lab appears to work flawlessly; the new hybrid modem fw now needs to be
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152 tested by a larger number of users in real-life usage.
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153
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154 Other blobs
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155 ===========
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156
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157 Our TCS2/TCS3 hybrid firmware is built almost entirely from source; the only
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158 components which are linked in the form of prebuilt objects or libraries are
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159 certain glue components in GPF (specifically OSL and OSX), the Nucleus PLUS RTOS
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160 and the TMS470 compiler's equivalent of libc/libgcc. In the case of Nucleus we
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161 have another version of it in full source form, but switching to a different
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162 version of Nucleus is outside the scope of FC Magnetite - see the next section.
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163 In the case of OSL and OSX, we have a reconstructed source and one can build a
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164 Magnetite config (hybrid-osl) that uses these reconstructed versions of OSL and
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165 OSX instead of the blobs, but we are not 100% confident in the quality of this
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166 reconstruction, hence this hybrid-osl config is currently considered
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167 experimental, not production.
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168
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169 Blob-free, gcc-built version
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170 ============================
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171
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172 For those who require or desire a firmware version that is completely free of
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173 any blobs and builds with a FLOSS compiler, we now have a new experimental
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174 firmware project called FreeCalypso Selenite:
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175
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176 https://www.freecalypso.org/hg/fc-selenite/
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177
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178 FC Selenite is based on FC Magnetite (just the modem functionality, no work-in-
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179 progress phone UI, and only the hybrid code version), but it uses the new
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180 full-source version of Nucleus and our reconstructed versions of OSL and OSX,
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181 and it offers the option of building either with the original TMS470 compiler
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182 or with gcc. The gcc-built version also uses entirely new implementations of
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183 all assembly components and linker script magic, as the two toolchain
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184 environments are entirely different in this regard.
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185
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186 This new Selenite firmware is expected to fully supplant our earlier and now
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187 completely unmaintained Citrine fw (our first attempt at gcc-built fw), but it
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188 is still highly experimental: as of this writing, GPRS does not work at all in
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189 Selenite-gcc (Citrine does not have any GPRS support either), and even the
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190 GSM-only config with GPRS disabled exhibits some intermittent glitches. Thus
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191 the stable production fw is still TMS470-built FC Magnetite for the time being.
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192
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193 Further reading
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194 ===============
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195
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196 For various instructions and notes specific to this FreeCalypso Magnetite
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197 firmware, look in the doc directory. For more information about the overall
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198 FreeCalypso project and our hardware building aspirations, go to our website:
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199
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200 https://www.freecalypso.org/