source: clfs-embedded/BOOK/cross-tools/mips/variables.xml@ 4d261af

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;
]>

<sect1 id="ch-cross-tools-variables">
  <?dbhtml filename="variables.html"?>

  <title>Build Variables</title>

  <bridgehead renderas="sect4">Setting Host and Target</bridgehead>

  <para os="a">During the building of the cross-compile tools you will need to
  set a few variables that will be dependent on your particular needs.
  You will need to set the target triplet for the target architecture, the MIPS
  level, and CPU endianess. If you do not know what triplet or level you want,
  you can use the table at the bottom of this page as a reference. Set
  the command using the method listed below:</para>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/variables.xml"
  xpointer="xpointer(//*[@os='b'])"/>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/variables.xml"
  xpointer="xpointer(//*[@os='c'])"/>

<screen os="d"><userinput>export CLFS_ARCH=$(echo ${CLFS_TARGET} | sed -e 's/\(mips\)\(64\)\?\(el\)\?-.*/\1\3/')
export CLFS_ENDIAN=$(echo ${CLFS_ARCH} | sed -e 's/mipsel/little/' -e 's/mips/big/')</userinput></screen>

  <para os="m1">Now you will need to set the MIPS LEVEL. This determines how your
  GCC and uClibc are built. There are currently 5 MIPS ISA Levels. To keep things 
  simple we are only using two. For more information, see
  <ulink url="http://www.linux-mips.org/wiki/Instruction_Set_Architecture"/></para>

<screen os="m2"><userinput>export CLFS_MIPS_LEVEL="<replaceable>[mips level]</replaceable>"</userinput></screen>

  <para os="m3">We also need to select the floating point capability of the CPU.
  If the CPU has built-in hardware for performing floating point calculations,
  choose "hard", otherwise choose "soft":</para>

<screen os="m4"><userinput>export CLFS_FLOAT="<replaceable>[hard or soft]</replaceable>"</userinput></screen>

  <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
  href="../common/variables.xml"
  xpointer="xpointer(//*[@os='g'])"/>

<screen os="h"><userinput>echo export CLFS_HOST=\""${CLFS_HOST}\"" &gt;&gt; ~/.bashrc
echo export CLFS_TARGET=\""${CLFS_TARGET}\"" &gt;&gt; ~/.bashrc
echo export CLFS_ARCH=\""${CLFS_ARCH}\"" &gt;&gt; ~/.bashrc
echo export CLFS_ENDIAN=\""${CLFS_ENDIAN}\"" &gt;&gt; ~/.bashrc
echo export CLFS_MIPS_LEVEL=\""${CLFS_MIPS_LEVEL}\"" &gt;&gt; ~/.bashrc
echo export CLFS_FLOAT=\""${CLFS_FLOAT}\"" &gt;&gt; ~/.bashrc</userinput></screen>

  <table os="i">
    <title>Processor Type and  Target Triplets</title>
    <?dbfo table-width="5.5in" ?>

    <tgroup cols="2">

      <colspec colnum="1" colwidth="2in"   colname="Processor"/>
      <colspec colnum="2" colwidth="2.5in" colname="Triplet"/>
      <colspec colnum="3" colwidth="1in"   colname="MIPS Level"/>

      <thead>
        <row>
          <entry>Processor</entry>
          <entry>Target Triplet</entry>
          <entry>MIPS Level</entry>
        </row>
      </thead>

      <tbody>
        <row>
          <entry>MIPS 32 bits Little Endian</entry>
          <entry>mipsel-unknown-linux-uclibc</entry>
          <entry>1</entry>
        </row>
        <row>
          <entry>MIPS 32 bits Big Endian</entry>
          <entry>mips-unknown-linux-uclibc</entry>
          <entry>1</entry>
        </row>
        <row>
          <entry>MIPS 64 bits Little Endian</entry>
          <entry>mips64el-unknown-linux-uclibc</entry>
          <entry>3</entry>
        </row>
        <row>
          <entry>MIPS 64 bits Big Endian</entry>
          <entry>mips64-unknown-linux-uclibc</entry>
          <entry>3</entry>
        </row>
      </tbody>

    </tgroup>

  </table>

</sect1>