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doc/Developer-notes written
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 09 Nov 2018 03:04:02 +0000
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1 The present article is a Selenite-specific addendum to the TCS211-fw-arch
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2 document in the freecalypso-docs repository; the latter document needs to be
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3 read first before this one. Also because FC Selenite is derived from FC
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4 Magnetite, you should also read the Developer-notes document in the fc-magnetite
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5 source repository before the present one.
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6
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7 Source tree layout
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8 ==================
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9
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10 The principal difference between Magnetite and Selenite in terms of the source
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11 tree layout is that Magnetite supports building two different code base variants
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12 (either pure TCS211 with G23M PS blobs or our FreeCalypso signature TCS2/TCS3
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13 hybrid), whereas Selenite only supports the hybrid code base. Dropping support
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14 for the non-hybrid version is necessary in order to have a saner code base for
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15 new forward developments such as the compiler migration to gcc (the objective
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16 of FC Selenite) or the future planned UI development work which will be done in
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17 yet another to-be-created source tree after we build the necessary hardware.
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18
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19 The source tree change is the elimination of parallel versions: in Magnetite we
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20 have to maintain two parallel versions for many firmware components, whereas in
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21 Selenite there is only one version, the one corresponding to our FreeCalypso
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22 signature TCS2/TCS3 hybrid explained in the TCS211-fw-arch document.
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23
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24 The directories under src/ are now as follows:
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25
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26 condat
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27
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28 This subtree is the amalgamation of condat2 and condat3 from Magnetite,
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29 hybridized as detailed in the TCS211-fw-arch document.
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30
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31 cs
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32
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33 This subtree is an import of chipsetsw from TCS211, plus our own
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34 reconstruction of those parts of TCS211 chipsetsw which were censored
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35 out in our starting copy: src/cs/layer1, src/cs/system/main and the
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36 src/cs/system/bootloader/src stub.
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37
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38 This subtree is kept in sync with Magnetite as much as possible; the
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39 diffs from Magnetite are to support gcc and the new version of Nucleus.
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40
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41 g23m-aci
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42 g23m-fad
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43 g23m-gprs
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44 g23m-gsm
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45
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46 These directories contain the new TCS3 version of the G23M PS+ACI code
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47 realm for our blob-free hybrid. The directory layout comes directly
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48 from our TCS3.2 source from Peek/FGW: TI previously kept all G23M code
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49 under g23m/condat/ms/src, but then they moved to these new g23m-*
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50 directories which I (Mother Mychaela) like for their shortness, so we
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51 enthusiastically kept the new directory layout. Only two pieces still
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52 resided under g23m/condat/ms/src in our TCS3.2 source: ati_ext and upm,
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53 which we moved into g23m-aci and g23m-gprs, respectively, where they
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54 properly belong. Just like in Magnetite, our TCS2/TCS3 hybrid uses the
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55 TCS2 version of ALR; in Selenite it has been moved to g23m-gsm/alr2.
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56
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57 These directories are kept in sync with Magnetite as much as possible;
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58 the diffs from Magnetite are fixes (band-aids in some cases) to pass
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59 compilation with gcc.
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60
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61 gpf
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62
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63 This subtree is the amalgamation of gpf2 and gpf3 from Magnetite; see
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64 TCS211-fw-arch for the explanation of how our version of GPF has been
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65 reconstructed from the surviving bits and pieces. One additional change
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66 is that the old Nucleus header files have been moved out of the way so
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67 that we always use the new Nucleus headers without ambiguity or
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68 conflict.
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69
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70 libsys
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71
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72 This library is specific to the gcc-built configuration. We use newlib
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73 that is built as part of our gcc toolchain (see Toolchain-setup-gcc) as
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74 our libc implementation for the most part, but for a few functions we
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75 are not able to use newlib's implementation because it uses malloc or
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76 depends on a Unix syscall environment which we don't have; libsys
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77 provides our own replacements for these few libc functions.
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78
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79 nucleus
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80
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81 We use a non-TI-sourced version of Nucleus from Comrade XVilka; because
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82 it does not come from any of our TI-sourced components, it gets its own
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83 top-level source directory.
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84
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85 Assembly code pieces
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86 ====================
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87
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88 Like any other software that runs on the bare metal as opposed to an application
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89 under some high-level OS like Linux, our FreeCalypso GSM fw necessarily includes
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90 some assembly code pieces in addition to the main body of C code. The
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91 differences between TI's TMS470 and GNU ARM environments and ABIs are great,
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92 hence entirely different versions of all assembly code pieces and linker script
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93 magic are needed between the two. For the TMS470 compiler environment all
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94 assembly code pieces and linker scripts are essentially unchanged from TI's
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95 TCS211, whereas for the gcc version all assembly code is entirely new. This
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96 assembly code and other support pieces that are specific to the gcc environment
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97 (see libsys above) originate from our first attempts at gcc-built GSM fw from
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98 the 2013-2015 timeframe.
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99
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100 The use of two entirely independent assembly code implementations between the
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101 two compiler environments gives rise to some minor architectural differences:
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102 the new gcc version takes the approach of routing interrupts and exceptions
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103 through the Calypso internal ROM (on all targets in both flashed and RAM-loaded
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104 builds) and uses flash boot mode 0 instead of flash boot mode 1 on the sensible
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105 non-Compal targets. Both of these design decisions require that the Calypso
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106 chip version be one of the new ones with boot ROM version 0300 (the one with
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107 all of the earlier bugs fixed); this requirement poses no problem for our own
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108 FreeCalypso hw and for the use case of running FreeCalypso fw on the historical
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109 hw from Motorola, Openmoko and Pirelli, but if anyone besides the Mother has an
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110 ancient D-Sample or Leonardo board with a Calypso C05 chip on it, those boards
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111 cannot run Selenite-gcc.
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112
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113 Configuration and build system
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114 ==============================
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115
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116 The configuration and build system of FC Selenite is based on that of Magnetite;
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117 please read the Developer-notes document in the fc-magnetite source repository.
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118
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119 The first difference from Magnetite is that Selenite does not have overall fw
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120 configuration recipes like Magnetite has in configs/* - instead the recipe for
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121 the hybrid modem configuration (the only config in the Magnetite sense that is
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122 supported in Selenite) has been incorporated into the new configure-gcc.sh
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123 and configure-tms470.sh scripts. The selection of which components will be
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124 included or excluded is driven by GPRS, SRVC and FCHG_STATE config variables -
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125 these config vars exist in Magnetite too, but in Selenite they can be set by
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126 the user on the configure command line.
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127
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128 The individual component build recipes in components/* are similar between
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129 Magnetite and Selenite, but the following aspects are different:
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130
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131 * There are no component variants: for each given foo.lib (TMS470) or foo.a
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132 (gcc) firmware component, there is only one components/foo recipe.
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133
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134 * Except for a few gcc-specific components and one TMS470-specific component
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135 (the empty bootloader stub, see TCS211-fw-arch), every components/foo recipe
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136 has to work for both TMS470 and gcc environments. The CFLAGS Bourne shell
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137 variable is for TI's cl470 compiler, CFLAGS_gcc is for gcc, and CPPFLAGS are
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138 common for both.
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139
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140 * The shell function call for compiling C source files is c_file, replacing
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141 Magnetite's cfile_plain and cfile_str2ind - there is no support for str2ind
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142 in Selenite.
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Mychaela Falconia <falcon@freecalypso.org>
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143
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Mychaela Falconia <falcon@freecalypso.org>
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144 Because there is no hybrid vs. classic TCS211 dichotomy in Selenite, there are
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145 no more header file selection shell variables - see the ex script in
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Mychaela Falconia <falcon@freecalypso.org>
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146 scripts/convert-from-magnetite.ex for the idea.