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annotate README @ 584:257b1c14db87

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tpudrv12.c: TSPEN1 configuration fix for Pirelli DP-L10
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 07 Mar 2019 21:21:20 +0000
parents 39a226a06196
children c32c887ced3a
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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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25
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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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53
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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://bitbucket.org/falconian/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/