1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ |
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
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5 | %general-entities; |
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6 | ]> |
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7 | |
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8 | <sect1 id="ch-cross-tools-variables"> |
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9 | <?dbhtml filename="variables.html"?> |
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10 | |
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11 | <title>Build Variables</title> |
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12 | |
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13 | <bridgehead renderas="sect4">Setting Host and Target</bridgehead> |
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14 | |
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15 | <para os="a">During the building of the cross-compile tools, you will need to |
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16 | set a few variables that will be dependent on your particular needs. |
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17 | You will need to select the target triplet for the target architecture, the CPU |
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18 | endianess, the CPU architecture, the CPU mode, the CPU floating point hardware |
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19 | availability, and (if available) the type of floating point hardware. If you |
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20 | do not know what values can be chosen for each of these, you can use the |
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21 | tables at the bottom of this page as a reference.</para> |
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22 | |
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23 | <para os="a1">First, set the host and target triplets:</para> |
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24 | |
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25 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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26 | href="../common/variables.xml" |
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27 | xpointer="xpointer(//*[@os='b'])"/> |
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28 | |
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29 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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30 | href="../common/variables.xml" |
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31 | xpointer="xpointer(//*[@os='c'])"/> |
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32 | |
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33 | <screen os="d"><userinput>export CLFS_ARCH=arm |
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34 | export CLFS_ENDIAN="<replaceable>[endianess]</replaceable>"</userinput></screen> |
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35 | |
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36 | <para os="e">Choose the ARM architecture (see table below) and mode of |
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37 | your CPU:</para> |
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38 | |
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39 | <screen os="f"><userinput>export CLFS_ARM_ARCH="<replaceable>[architecture]</replaceable>" |
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40 | export CLFS_ARM_MODE="<replaceable>[arm or thumb]</replaceable>"</userinput></screen> |
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41 | |
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42 | <para os="f1">If your target CPU has hard floating point support (not all ARM |
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43 | CPUs do), set the following CLFS_FLOAT variable to either "hard" or "softfp". |
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44 | If your target CPU does not have hard floating point support, set the following |
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45 | CLFS_FLOAT vairable to "soft".</para> |
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46 | |
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47 | <screen os="f2"><userinput>export CLFS_FLOAT="<replaceable>[hard, softfp, or soft]"</replaceable></userinput></screen> |
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48 | |
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49 | <para os="f3">If you chose either "hard" or "softfp" for CLFS_FLOAT, you now |
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50 | need to set which floating point hardware is actually included (see table below) |
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51 | with your ARM CPU:</para> |
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52 | |
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53 | <screen os="f4"><userinput>export CLFS_FPU="<replaceable>[fpu version]</replaceable>"</userinput></screen> |
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54 | |
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55 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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56 | href="../common/variables.xml" |
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57 | xpointer="xpointer(//*[@os='g'])"/> |
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58 | |
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59 | <screen os="h"><userinput>echo export CLFS_HOST=\""${CLFS_HOST}\"" >> ~/.bashrc |
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60 | echo export CLFS_TARGET=\""${CLFS_TARGET}\"" >> ~/.bashrc |
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61 | echo export CLFS_ARCH=\""${CLFS_ARCH}\"" >> ~/.bashrc |
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62 | echo export CLFS_ENDIAN=\""${CLFS_ENDIAN}\"" >> ~/.bashrc |
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63 | echo export CLFS_ARM_ARCH=\""${CLFS_ARM_ARCH}\"" >> ~/.bashrc |
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64 | echo export CLFS_ARM_MODE=\""${CLFS_ARM_MODE}\"" >> ~/.bashrc |
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65 | echo export CLFS_FLOAT=\""${CLFS_FLOAT}\"" >> ~/.bashrc |
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66 | echo export CLFS_FPU=\""${CLFS_FPU}\"" >> ~/.bashrc</userinput></screen> |
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67 | |
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68 | <table os="i"> |
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69 | <title>Example Processor Type, ABI, and Target Triplets</title> |
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70 | <?dbfo table-width="7in" ?> |
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71 | |
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72 | <tgroup cols="2"> |
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73 | |
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74 | <colspec colnum="1" colwidth="2.5in" colname="Processor"/> |
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75 | <colspec colnum="2" colwidth="1in" colname="Endianess"/> |
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76 | <colspec colnum="3" colwidth="1in" colname="ABI"/> |
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77 | <colspec colnum="4" colwidth="2.5in" colname="Triplet"/> |
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78 | |
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79 | <thead> |
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80 | <row> |
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81 | <entry>Processor</entry> |
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82 | <entry>Endianess</entry> |
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83 | <entry>ABI</entry> |
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84 | <entry>Target Triplet</entry> |
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85 | </row> |
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86 | </thead> |
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87 | |
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88 | <tbody> |
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89 | <row> |
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90 | <entry>Generic arm</entry> |
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91 | <entry>little</entry> |
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92 | <entry>OABI</entry> |
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93 | <entry>arm-unknown-linux-uclibc</entry> |
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94 | </row> |
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95 | <row> |
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96 | <entry>Generic arm, version 4</entry> |
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97 | <entry>little</entry> |
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98 | <entry>OABI</entry> |
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99 | <entry>armv4-unknown-linux-uclibc</entry> |
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100 | </row> |
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101 | <row> |
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102 | <entry>Generic arm, version 5</entry> |
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103 | <entry>little</entry> |
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104 | <entry>EABI</entry> |
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105 | <entry>armv5l-unknown-linux-uclibceabi</entry> |
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106 | </row> |
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107 | <row> |
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108 | <entry>Generic arm, version 5</entry> |
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109 | <entry>big</entry> |
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110 | <entry>EABI</entry> |
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111 | <entry>armv5b-unknown-linux-uclibceabi</entry> |
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112 | </row> |
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113 | <row> |
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114 | <entry>Generic arm</entry> |
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115 | <entry>little</entry> |
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116 | <entry>EABI</entry> |
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117 | <entry>arm-unknown-linux-uclibceabi</entry> |
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118 | </row> |
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119 | <row> |
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120 | <entry>Generic arm, version 7-a </entry> |
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121 | <entry>little</entry> |
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122 | <entry>EABI</entry> |
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123 | <entry>armv7a-unknown-linux-uclibceabi</entry> |
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124 | </row> |
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125 | </tbody> |
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126 | |
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127 | </tgroup> |
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128 | |
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129 | </table> |
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130 | |
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131 | <table os="j"> |
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132 | <title>ARM Archiecture Choices</title> |
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133 | <?dbfo table-width="4in" ?> |
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134 | |
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135 | <tgroup cols="2"> |
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136 | |
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137 | <colspec colnum="1" colwidth="1in" colname="Arch Choice"/> |
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138 | <colspec colnum="2" colwidth="1in" colname="Arch Choice"/> |
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139 | <colspec colnum="3" colwidth="1in" colname="Arch Choice"/> |
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140 | <colspec colnum="4" colwidth="1in" colname="Arch Choice"/> |
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141 | |
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142 | <tbody> |
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143 | <row> |
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144 | <entry>armv2</entry> |
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145 | <entry>armv2a</entry> |
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146 | <entry>armv3</entry> |
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147 | <entry>armv3m</entry> |
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148 | </row> |
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149 | <row> |
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150 | <entry>armv4</entry> |
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151 | <entry>armv4t</entry> |
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152 | <entry>armv5</entry> |
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153 | <entry>armv5t</entry> |
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154 | </row> |
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155 | <row> |
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156 | <entry>armv5te</entry> |
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157 | <entry>armv6</entry> |
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158 | <entry>armv6j</entry> |
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159 | <entry>armv6t2</entry> |
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160 | </row> |
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161 | <row> |
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162 | <entry>armv6z</entry> |
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163 | <entry>armv6zk</entry> |
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164 | <entry>armv6-m</entry> |
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165 | <entry>armv7</entry> |
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166 | </row> |
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167 | <row> |
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168 | <entry>armv7-a</entry> |
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169 | <entry>armv7-r</entry> |
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170 | <entry>armv7-m</entry> |
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171 | <entry>iwmmxt</entry> |
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172 | </row> |
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173 | <row> |
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174 | <entry>iwmmxt2</entry> |
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175 | <entry>ep9312</entry> |
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176 | </row> |
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177 | </tbody> |
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178 | </tgroup> |
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179 | </table> |
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180 | |
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181 | <table os="j"> |
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182 | <title>ARM Hard Floating Point Versions</title> |
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183 | <?dbfo table-width="4in" ?> |
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184 | |
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185 | <tgroup cols="2"> |
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186 | |
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187 | <colspec colnum="1" colwidth="1in" colname="FPU Choice"/> |
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188 | <colspec colnum="2" colwidth="1in" colname="FPU Choice"/> |
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189 | <colspec colnum="3" colwidth="1in" colname="FPU Choice"/> |
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190 | <colspec colnum="4" colwidth="1in" colname="FPU Choice"/> |
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191 | |
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192 | <tbody> |
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193 | <row> |
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194 | <entry>fpa</entry> |
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195 | <entry>fpe2</entry> |
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196 | <entry>fpe3</entry> |
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197 | <entry>maverick</entry> |
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198 | </row> |
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199 | <row> |
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200 | <entry>vfp</entry> |
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201 | <entry>vfpv3</entry> |
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202 | <entry>vfpv3-fp16</entry> |
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203 | <entry>vfpv3-d16</entry> |
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204 | </row> |
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205 | <row> |
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206 | <entry>vfpv3-d16-fp16</entry> |
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207 | <entry>vfpv3xd</entry> |
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208 | <entry>vfpv3xd-fp16</entry> |
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209 | <entry>neon</entry> |
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210 | </row> |
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211 | <row> |
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212 | <entry>neon-fp16</entry> |
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213 | <entry>vfpv4</entry> |
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214 | <entry>vfpv4-d16</entry> |
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215 | <entry>fpv4-sp-d16</entry> |
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216 | </row> |
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217 | <row> |
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218 | <entry>neon-vfpv4</entry> |
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219 | </row> |
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220 | </tbody> |
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221 | </tgroup> |
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222 | </table> |
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223 | |
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224 | </sect1> |
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