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doc/Tango-pinmux: definitions laid down
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 24 Jun 2020 18:46:25 +0000
parents 343104963a7f
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1 The present article is a Magnetite-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.
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4
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5 Source tree layout
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6 ==================
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7
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8 The arrangement of source components under src/ in FC Magnetite is somewhat
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9 peculiar because it is designed to support building two different code base
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10 variants: either pure TCS211 without any code from TCS3/LoCosto (which requires
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11 using a binary-only version of the G23M PS component) or our FreeCalypso
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12 signature TCS2/TCS3 hybrid which is blob-free in this regard. The directories
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13 under src/ are as follows:
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14
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15 aci2
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16
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17 This subtree is an import of g23m/condat/ms/src from TCS211; it is
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18 named aci2 because it primarily contains the TCS2 version of ACI and
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19 the UI layers (BMI+MFW) that go with it, but it also contains the
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20 source for ALR from TCS211 which is used in our TCS2/TCS3 hybrid.
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21
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22 condat2
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23
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24 This subtree is an import of g23m/condat from TCS211, pruned to just
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25 com and frame subtrees, with int and ms subtrees omitted. The header
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26 files found in this subtree are used only in the pure TCS211 configs,
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27 but most of the source modules in this same subtree are used in both
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28 pure TCS211 and hybrid configs.
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29
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30 condat3
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31
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32 This subtree is an import of g23m/condat from TCS3.2, similarly pruned
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33 to just com and frame subtrees. This subtree is used only for hybrid
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34 configs, and mostly for the header files under condat3/com/inc and
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35 condat3/com/include; the only C module taken from condat3 is cl_rlcmac.c
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36 in comlib.
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37
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38 Two header files under condat3/com/include (pwr.h and rtc.h) have been
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39 replaced with TCS211 versions as part of the hybridization.
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40
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41 cs
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42
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43 This subtree is an import of chipsetsw from TCS211, plus our own
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44 reconstruction of those parts of TCS211 chipsetsw which were censored
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45 out in our starting copy: src/cs/layer1, src/cs/system/main and the
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46 src/cs/system/bootloader/src stub. Because our reconstruction of these
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47 pieces meticulously replicates the original blobs, it still counts as
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48 pure TCS211 and is not a hybrid. This chipsetsw division is invariant
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49 among all of our configs, both pure TCS211 and TCS2/TCS3 hybrid.
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50
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51 g23m-aci
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52 g23m-fad
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53 g23m-gprs
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54 g23m-gsm
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55
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56 These directories contain the new TCS3 version of the G23M PS+ACI code
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57 realm for our blob-free hybrid. The directory layout comes directly
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58 from our TCS3.2 source from Peek/FGW: TI previously kept all G23M code
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59 under g23m/condat/ms/src, but then they moved to these new g23m-*
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60 directories which I (Mother Mychaela) like for their shortness, so we
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61 enthusiastically kept the new directory layout. Only two pieces still
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62 resided under g23m/condat/ms/src in our TCS3.2 source: ati_ext and upm,
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63 which we moved into g23m-aci and g23m-gprs, respectively, where they
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64 properly belong.
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65
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66 gpf2
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67 gpf3
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68
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69 gpf2 is an import of the gpf tree from TCS211; gpf3 is an import of the
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70 gpf tree from TCS3.2/LoCosto. Both imports have been pruned to just
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71 the sources and headers present in each respective version, without
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72 binary libs, Windows tools and other junk.
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73
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74 Our own reconstruction of OSL and OSX components has been added under
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75 gpf2.
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76
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77 ui3
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78
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79 This subtree contains the new TCS3 version of phone UI (BMI+MFW)
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80 components, used in our UI-enabled hybrid configs instead of the old
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81 TCS2 version under aci2.
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82
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83 Two versions of ACI
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84 ===================
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85
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86 ACI is a firmware component that receives a lot of development activity as we
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87 add new AT commands and other new-to-FreeCalypso functionality, and for as long
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88 as we support both pure TCS211 and TCS2/TCS3 hybrid configurations, we have to
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89 maintain two different versions of ACI in parallel. The version under
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90 src/aci2/aci is used in pure TCS211 configs and works only with the all-blobs
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91 version of G23M PS, whereas the other version under src/g23m-aci/aci is used in
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92 hybrid configs going forward. We strive to keep them in sync, but the hybrid
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93 version is the forward-looking one - those who seek to understand our firmware
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94 starting from a blank slate should focus on the new TCS3 version under g23m-aci.
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95
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96 Two versions of ALR
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97 ===================
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98
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99 Our TCS2/TCS3 hybrid involves grafting the new TCS3 version of G23M PS onto the
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100 old TCS211 L1, and there naturally has to be a splice point somewhere. ALR is
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101 the component of the G23M PS whose job is to interface to L1, and we have the
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102 source for both TCS2 and TCS3 versions of ALR. Support for Calypso L1 in the
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103 new version of ALR is badly bitrotten, thus we took the approach of keeping the
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104 L1-matching TCS211 version of ALR and putting the splice point just above it.
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105
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106 The L1-matching TCS211 version of ALR we are using resides in src/aci2/alr; the
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107 other version in src/g23m-gsm/alr fails to compile in the Calypso configuration.
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108
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109 Header file selection
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110 =====================
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111
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112 A critical distinction between pure TCS211 vs hybrid configs is the choice of
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113 header files. Our pure TCS211 configs include the following stanza:
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114
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115 CONDAT=condat2
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116 GPF=gpf2
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117 CDGINC=cdg211/cdginc
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118 CDGPRIM=cdg211/prim
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119 ACI=aci2
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120
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121 whereas our hybrid configs include this other stanza:
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122
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123 CONDAT=condat3
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124 GPF=gpf3
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125 CDGINC=cdg-hybrid/cdginc
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126 CDGPRIM=cdg-hybrid/sap-inline
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127 ACI=g23m-aci
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128
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129 The following header files are hereby switched:
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130
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131 * Condat headers which would have been under condat/com/inc and
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132 condat/com/include if we didn't have our condat2 vs. condat3 dichotomy;
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133
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134 * cdginc generated header files - see TCS211-fw-arch document for the
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135 explanation;
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136
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137 * ACI headers.
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138
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139 The gpf2 vs. gpf3 include switch can be considered superfluous, as there are no
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140 substantive differences between the two versions - do a diff -ur src/gpf[23]
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141 to see for yourself.
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142
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143 Configuration and build system
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144 ==============================
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145
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146 Our firmware configuration and build system is implemented in Bourne shell with
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147 a few C helpers. This build system is driven by two kinds of recipes: firmware
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148 configuration recipes (configs/*) and individual component build recipes
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149 (components/*). The overall fw configuration recipe sets up some Bourne shell
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150 variables which apply to the entire fw build configuration (which include the
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151 header file selection variables described above), invokes the script that
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152 generates the same config header files which were generated by TI's original
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153 TCS211 build system, and then lists all components which are to be included in
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154 the given fw build configuration. For each component to be included, the
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155 configuration recipe specifies whether it is to be built from source or included
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156 as a blob library; for each component to be built from source the corresponding
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157 component build recipe comes into play.
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158
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159 Each component has a name that equals the name of the *.lib linkable library
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160 into which it will be compiled, and some components come in multiple variants
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161 in relation to deblobbing or hybridization. If a given component is available
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162 in multiple variants, then each variant will have its own component build
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163 recipe, and the build_lib line in the overall fw configuration recipe specifies
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164 the variant to be used.
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165
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166 The individual component build recipes under components/* specify which actual
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167 C source files are to be compiled and with what options. The CFLAGS variable
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168 within these component build recipes sets cl470 compiler options that are
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169 treated as "voodoo", whereas the CPPFLAGS variable accumulates long lists of -D
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170 definitions and -I include paths, all of which have been taken from the BuSyB-
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171 generated makefiles of TCS211. Once CFLAGS and CPPFLAGS have been set, the
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172 actual C files are added to the build with cfile_plain and cfile_str2ind shell
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173 function calls; the difference between these two is that cfile_str2ind allows
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174 the possibility of preprocessing with str2ind whereas cfile_plain does not; the
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175 choice of which is used when has been taken from TCS211. Note that the use of
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176 str2ind is globally disabled by default and needs to be enabled with
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177 USE_STR2IND=1 if it is desired.
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178
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179 It also needs to be noted that the sources we got from TI include some C files
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180 and sometimes entire components that aren't used in our TCS211-mimicking
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181 FreeCalypso fw, and they can be quite confusing when one doesn't realize that
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182 they are defunct. There are also many components which are included in some
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183 configurations but not in others. To tell whether a given piece of C code is
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184 actually used in our firmware or not, you need to first study the overall fw
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185 configuration recipe for the config you are working with, and then study the
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186 individual component build recipes it invokes to see what actual C files are
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187 being compiled.