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annotate doc/Developer-notes @ 134:7d50d8d13711

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FFS code sync with Magnetite + gcc version fix This change brings the new flash autodetection for FC and Pirelli targets from Magnetite, and should also fix the gcc version for C1xx and gtamodem targets, which were previously broken because they used TI's original flash autodetect code (which operates at address 0) while the boot ROM is mapped there.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 11 Dec 2018 08:43:25 +0000
parents 3055bcff8050
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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
3055bcff8050 doc/Developer-notes written
Mychaela Falconia <falcon@freecalypso.org>
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142 in Selenite.
3055bcff8050 doc/Developer-notes written
Mychaela Falconia <falcon@freecalypso.org>
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143
3055bcff8050 doc/Developer-notes written
Mychaela Falconia <falcon@freecalypso.org>
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144 Because there is no hybrid vs. classic TCS211 dichotomy in Selenite, there are
3055bcff8050 doc/Developer-notes written
Mychaela Falconia <falcon@freecalypso.org>
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145 no more header file selection shell variables - see the ex script in
3055bcff8050 doc/Developer-notes written
Mychaela Falconia <falcon@freecalypso.org>
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146 scripts/convert-from-magnetite.ex for the idea.