FreeCalypso > hg > fc-magnetite

annotate README @ 210:5dab5306bac5

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configs: a couple of failed experiments
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Oct 2016 19:53:30 +0000
parents 9fb9f896bd77
children 75ea63a3fce5
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1 FreeCalypso Magnetite firmware project
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2 ======================================
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3
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4 This source tree contains yet another firmware offering created under the
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5 FreeCalypso umbrella. The key qualities of this firmware offering are:
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6
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7 Negatives:
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8
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9 * Builds with TI's proprietary TMS470 compiler and thus requires Wine;
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10 * Some of the fw components are still in the form of binary blobs -
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11 but see below on the deblobbing progress.
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12
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13 Positives:
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14
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15 * Can be built to run on Motorola C139, Openmoko GTA02 and Pirelli DP-L10
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16 targets, as well as the to-be-built FCDEV3B, all from the same source tree;
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17
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18 * Works as solidly as the TCS211 "golden" reference from TI, on all of the
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19 supported targets - deep sleep works, voice calls work in all codec modes
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20 including AMR, the DSP dynamic download mechanism does its magic, the call
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21 audio passes reliably in both directions.
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22
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23 The present FC Magnetite firmware is built on the principle of starting with
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24 the known working TCS211 code base, without any major restructuring, and making
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25 small incremental evolutionary changes, testing at every step to ensure that
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26 nothing breaks. It is the direct opposite of the "rebuild from the ground up"
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27 approach taken with our previous Citrine firmware (aka "gsm-fw"), the approach
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28 that produced very disappointing results.
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29
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30 Functionality
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31 =============
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32
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33 TI's GSM mobile station firmware architecture supports two ways in which the
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34 GSM device may be controlled: via AT commands from an external host and/or via
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35 a local UI on devices with LCD & keypad hardware. (I said "and/or" because the
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36 two mechanisms can coexist.) At the present time, however, only the AT command
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37 mode of operation is supported in FreeCalypso Magnetite. The effect of this
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38 limitation is that if you run this fw on a Motorola C139 or a Pirelli DP-L10,
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39 the phone's LCD will stay dark, the buttons won't do anything, and the
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40 phone-turned-modem can only be operated via AT commands sent via FreeCalypso
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41 host utility fc-shell.
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42
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43 The demo/prototype phone UI code in TI's reference fw delivery is written for
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44 a 176x220 pixel 16-bit color LCD (such an LCD was used on TI's official
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45 development platform called D-Sample), whereas our available Mot C139 and
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46 Pirelli targets have significantly smaller LCDs: 96x64 and 128x128 pixels,
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47 respectively. Prior to the D-Sample, TI had used 84x48 pixel black&white
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48 (1 bit per pixel) LCDs, and this old C-Sample LCD code is still there, albeit
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49 bitrotten. In late 2015 this author made a very dirty hack to resurrect TI's
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50 old C-Sample UI code and get it to display on the C139 phone LCD (84x48 is a
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51 proper subset of 96x64) - you can find this hack in the tcs211-c139 Hg tree.
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52
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53 The upshot of this LCD situation is that porting TI's phone UI code to run on
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54 Mot C139 or Pirelli DP-L10 will require major rework of the affected parts of
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55 the firmware. While I would like to do it eventually, I am not willing to do
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56 it right now - I would like to get this code running in its pristine state on
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57 its native 176x220 pix LCD *before* I hack the holy **** out of it for the
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58 C139/Pirelli port. I do have a real TI-made D-Sample kit with the right LCD,
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59 but unfortunately the main board has an older version of the core chipset for
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60 which we lack the necessary fw support, hence it doesn't help. Therefore, we
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61 will need to build our own Calypso board with a 176x220 pix 16-bit color LCD,
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62 get the UI-enabled GSM firmware running on that board, and only then proceed
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63 with C139 and/or Pirelli ports if such are still desired.
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64
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65 For now, modem or pseudo-modem operation with control via AT commands is all
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66 we have.
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67
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68 Build system
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69 ============
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70
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71 Even though FC Magnetite is essentially unchanged TCS211 code base and builds
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72 using TI's proprietary TMS470 compiler under Wine, the build system is entirely
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73 new. TI's TCS211 build system, called BuSyB, works by way of a Java tool
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74 generating a customized makefile for each desired build configuration, based on
96
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75 lots of magic contained in a big repository of XML files. There are a bunch of
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76 Perl scripts involved as well. The Java tool that does the heavy lifting exists
94
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77 only as compiled Java bytecode sans source, and the surrounding Perl scripts
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78 aren't very understandable either. And the whole thing thoroughly assumes a
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79 Windows environment (drive letters, backslashes, case-insensitive file system)
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80 throughout. As a result, when working with TCS211 fw with its original build
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81 system, we had to treat these BuSyB-generated makefiles almost as being blobs in
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82 themselves: regenerating a makefile from XML magic required major effort, there
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83 were some bugs in the makefile generation which we couldn't fix and thus we had
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84 to edit the makefiles manually after each regeneration - it was an utter mess,
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85 and absolutely not an acceptable way to build a forward-looking, community-
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86 serving project.
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87
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88 In FC Magnetite I have recreated the relevant parts of the TCS211 build system,
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89 using Bourne shell magic instead of Java and XML. Just like TI's BuSyB, ours
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90 is a makefile generation system: in order to compile the firmware in a
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91 particular desired configuration, you run a shell script to select the config
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92 you would like. This shell script will create a dedicated build directory tree
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93 to fully contain this build, and populate it with generated Makefiles and some
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94 other bits - then you go into the just-created build directory and run make
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95 there. The source and build trees are thus cleanly separated. See
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96 doc/Compiling for detailed instructions.
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97
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98 Another key difference from our previous TCS211-based firmware offerings is that
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99 even though we still have to run TI's compiler binaries under Wine, the Wine
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100 invokation has been moved from the top (root) of the build process to the
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101 bottom leaves. With our previous TCS211-based works you would run Wine at the
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102 top, and then the entire build process would proceed in the Windows environment,
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103 using Windows versions of make and other nonsense. Not so in FC Magnetite:
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104 in this firmware project all shell scripts, Makefiles, Perl scripts and other
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105 build system accessories run at the native Unix level, and Wine is only invoked
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106 at the lowest level by individual tool wrappers: for example, TI's compiler
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107 binary cl470.exe is encapsulated in a Unix shell script called cl470 that
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108 invokes Wine to run the Windows binary, presenting the illusion of a native
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109 Unix tool to all upper levels.
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110
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111 As yet another defenestration measure, all source files are checked into this
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112 tree with Unix line endings.
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113
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114 Blob status
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115 ===========
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116
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117 A long-term FreeCalypso goal is to have our phone/modem firmware rebuild fully
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118 from source without any blobs, but this goal has not been achieved yet. While
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119 we do have what *seems* to be a suitable replacement source (or feasible ability
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120 to reconstruct such) for every piece of TCS211 fw that came in binary-only form,
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121 actually making this replacement without breaking functionality is a very
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122 non-trivial endeavor. Our previous attempt to rebuild the firmware from the
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123 ground up, using source pieces lifted from different available leaks and
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124 building with gcc so that no TMS470 COFF blobs could be used, produced very
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125 disappointing results.
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126
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127 Instead the new FreeCalypso firmware approach implemented in FC Magnetite is to
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128 approach the blob-free goal incrementally. The new Magnetite build system is
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129 specifically designed to enable the transition from the use of blobs to
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130 recompilation from source to be made with very fine granularity, down to the
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131 level of individual object modules within libs if necessary. We tackle one
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132 binary-only component at a time, either reconstructing the missing source from
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133 disassembly or adapting the source from a different version as works best in
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134 each individual case, and we make a test build of the firmware using the
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135 reconstructed or fitted component instead of the original blob. If the firmware
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136 still works (doesn't break), we make this deblobbing transition permanent and
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137 move on to the next component.
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138
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139 As of this writing, most of Layer 1 and a few housekeeping parts of the fw have
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140 already been deblobbed, i.e., are now recompiled from source. The G23M protocol
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141 stack is our next deblobbing target - we have a newer version of it in full
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142 source form, and we are hoping to be able to retrofit this newer G23M version
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143 into the TCS211 environment in order to replace the binary blob version we are
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144 using currently.
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145
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146 Further reading
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147 ===============
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148
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149 For various instructions and notes specific to this FreeCalypso Magnetite
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150 firmware, look in the doc directory. For more information about the overall
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151 FreeCalypso project and our hardware building aspirations, go to our website:
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152
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153 https://www.freecalypso.org/