source: clfs-embedded/BOOK/cross-tools/arm/variables.xml@ 23af529

Last change on this file since 23af529 was b220338, checked in by Andrew Bradford <bradfa@…>, 14 years ago

Added ARM choices to enable --disable-multilib

Added info on choosing everything that's needed in order to use
--disable-multilib:
float, mode, fpu, and arch (already had abi).
  • Property mode set to 100644
File size: 7.2 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-cross-tools-variables">
9 <?dbhtml filename="variables.html"?>
10
11 <title>Build Variables</title>
12
13 <bridgehead renderas="sect4">Setting Host and Target</bridgehead>
14
15 <para os="a">During the building of the cross-compile tools, you will need to
16 set a few variables that will be dependent on your particular needs.
17 You will need to select the target triplet for the target architecture, the CPU
18 endianess, the CPU architecture, the CPU mode, the CPU floating point hardware
19 availability, and (if available) the type of floating point hardware. If you
20 do not know what values can be chosen for each of these, you can use the
21 tables at the bottom of this page as a reference.</para>
22
23 <para os="a1">First, set the host and target triplets:</para>
24
25 <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
26 href="../common/variables.xml"
27 xpointer="xpointer(//*[@os='b'])"/>
28
29 <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
30 href="../common/variables.xml"
31 xpointer="xpointer(//*[@os='c'])"/>
32
33<screen os="d"><userinput>export CLFS_ARCH=arm
34export CLFS_ENDIAN="<replaceable>[endianess]</replaceable>"</userinput></screen>
35
36 <para os="e">Choose the ARM architecture (see table below) and mode of
37 your CPU:</para>
38
39<screen os="f"><userinput>export CLFS_ARM_ARCH="<replaceable>[architecture]</replaceable>"
40export CLFS_ARM_MODE="<replaceable>[arm or thumb]</replaceable>"</userinput></screen>
41
42 <para os="f1">If your target CPU has hard floating point support (not all ARM
43 CPUs do), set the following CLFS_FLOAT variable to either "hard" or "softfp".
44 If your target CPU does not have hard floating point support, set the following
45 CLFS_FLOAT vairable to "soft".</para>
46
47<screen os="f2"><userinput>export CLFS_FLOAT="<replaceable>[hard, softfp, or soft]"</replaceable></userinput></screen>
48
49 <para os="f3">If you chose either "hard" or "softfp" for CLFS_FLOAT, you now
50 need to set which floating point hardware is actually included (see table below)
51 with your ARM CPU:</para>
52
53<screen os="f4"><userinput>export CLFS_FPU="<replaceable>[fpu version]</replaceable>"</userinput></screen>
54
55 <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
56 href="../common/variables.xml"
57 xpointer="xpointer(//*[@os='g'])"/>
58
59<screen os="h"><userinput>echo export CLFS_HOST=\""${CLFS_HOST}\"" &gt;&gt; ~/.bashrc
60echo export CLFS_TARGET=\""${CLFS_TARGET}\"" &gt;&gt; ~/.bashrc
61echo export CLFS_ARCH=\""${CLFS_ARCH}\"" &gt;&gt; ~/.bashrc
62echo export CLFS_ENDIAN=\""${CLFS_ENDIAN}\"" &gt;&gt; ~/.bashrc
63echo export CLFS_ARM_ARCH=\""${CLFS_ARM_ARCH}\"" &gt;&gt; ~/.bashrc
64echo export CLFS_ARM_MODE=\""${CLFS_ARM_MODE}\"" &gt;&gt; ~/.bashrc
65echo export CLFS_FLOAT=\""${CLFS_FLOAT}\"" &gt;&gt; ~/.bashrc
66echo export CLFS_FPU=\""${CLFS_FPU}\"" &gt;&gt; ~/.bashrc</userinput></screen>
67
68 <table os="i">
69 <title>Example Processor Type, ABI, and Target Triplets</title>
70 <?dbfo table-width="7in" ?>
71
72 <tgroup cols="2">
73
74 <colspec colnum="1" colwidth="2.5in" colname="Processor"/>
75 <colspec colnum="2" colwidth="1in" colname="Endianess"/>
76 <colspec colnum="3" colwidth="1in" colname="ABI"/>
77 <colspec colnum="4" colwidth="2.5in" colname="Triplet"/>
78
79 <thead>
80 <row>
81 <entry>Processor</entry>
82 <entry>Endianess</entry>
83 <entry>ABI</entry>
84 <entry>Target Triplet</entry>
85 </row>
86 </thead>
87
88 <tbody>
89 <row>
90 <entry>Generic arm</entry>
91 <entry>little</entry>
92 <entry>OABI</entry>
93 <entry>arm-unknown-linux-uclibc</entry>
94 </row>
95 <row>
96 <entry>Generic arm, version 4</entry>
97 <entry>little</entry>
98 <entry>OABI</entry>
99 <entry>armv4-unknown-linux-uclibc</entry>
100 </row>
101 <row>
102 <entry>Generic arm, version 5</entry>
103 <entry>little</entry>
104 <entry>EABI</entry>
105 <entry>armv5l-unknown-linux-uclibceabi</entry>
106 </row>
107 <row>
108 <entry>Generic arm, version 5</entry>
109 <entry>big</entry>
110 <entry>EABI</entry>
111 <entry>armv5b-unknown-linux-uclibceabi</entry>
112 </row>
113 <row>
114 <entry>Generic arm</entry>
115 <entry>little</entry>
116 <entry>EABI</entry>
117 <entry>arm-unknown-linux-uclibceabi</entry>
118 </row>
119 <row>
120 <entry>Generic arm, version 7-a </entry>
121 <entry>little</entry>
122 <entry>EABI</entry>
123 <entry>armv7a-unknown-linux-uclibceabi</entry>
124 </row>
125 </tbody>
126
127 </tgroup>
128
129 </table>
130
131 <table os="j">
132 <title>ARM Archiecture Choices</title>
133 <?dbfo table-width="4in" ?>
134
135 <tgroup cols="2">
136
137 <colspec colnum="1" colwidth="1in" colname="Arch Choice"/>
138 <colspec colnum="2" colwidth="1in" colname="Arch Choice"/>
139 <colspec colnum="3" colwidth="1in" colname="Arch Choice"/>
140 <colspec colnum="4" colwidth="1in" colname="Arch Choice"/>
141
142 <tbody>
143 <row>
144 <entry>armv2</entry>
145 <entry>armv2a</entry>
146 <entry>armv3</entry>
147 <entry>armv3m</entry>
148 </row>
149 <row>
150 <entry>armv4</entry>
151 <entry>armv4t</entry>
152 <entry>armv5</entry>
153 <entry>armv5t</entry>
154 </row>
155 <row>
156 <entry>armv5te</entry>
157 <entry>armv6</entry>
158 <entry>armv6j</entry>
159 <entry>armv6t2</entry>
160 </row>
161 <row>
162 <entry>armv6z</entry>
163 <entry>armv6zk</entry>
164 <entry>armv6-m</entry>
165 <entry>armv7</entry>
166 </row>
167 <row>
168 <entry>armv7-a</entry>
169 <entry>armv7-r</entry>
170 <entry>armv7-m</entry>
171 <entry>iwmmxt</entry>
172 </row>
173 <row>
174 <entry>iwmmxt2</entry>
175 <entry>ep9312</entry>
176 </row>
177 </tbody>
178 </tgroup>
179 </table>
180
181 <table os="j">
182 <title>ARM Hard Floating Point Versions</title>
183 <?dbfo table-width="4in" ?>
184
185 <tgroup cols="2">
186
187 <colspec colnum="1" colwidth="1in" colname="FPU Choice"/>
188 <colspec colnum="2" colwidth="1in" colname="FPU Choice"/>
189 <colspec colnum="3" colwidth="1in" colname="FPU Choice"/>
190 <colspec colnum="4" colwidth="1in" colname="FPU Choice"/>
191
192 <tbody>
193 <row>
194 <entry>fpa</entry>
195 <entry>fpe2</entry>
196 <entry>fpe3</entry>
197 <entry>maverick</entry>
198 </row>
199 <row>
200 <entry>vfp</entry>
201 <entry>vfpv3</entry>
202 <entry>vfpv3-fp16</entry>
203 <entry>vfpv3-d16</entry>
204 </row>
205 <row>
206 <entry>vfpv3-d16-fp16</entry>
207 <entry>vfpv3xd</entry>
208 <entry>vfpv3xd-fp16</entry>
209 <entry>neon</entry>
210 </row>
211 <row>
212 <entry>neon-fp16</entry>
213 <entry>vfpv4</entry>
214 <entry>vfpv4-d16</entry>
215 <entry>fpv4-sp-d16</entry>
216 </row>
217 <row>
218 <entry>neon-vfpv4</entry>
219 </row>
220 </tbody>
221 </tgroup>
222 </table>
223
224</sect1>
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