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Add an introduction to chapter 6 and 7

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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11910 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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Pierre Labastie 2020-06-09 13:35:39 +00:00
parent a89ab79538
commit ce335792fe
4 changed files with 43 additions and 32 deletions
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1
chapter06/chapter06.xml
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@ -11,6 +11,7 @@
<title>Cross Compiling Temporary Tools</title>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="introduction.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="m4.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="ncurses.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="bash.xml"/>

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chapter06/introduction.xml
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@ -5,25 +5,26 @@
%general-entities;
]>
<sect1 id="ch-tools-introduction">
<sect1 id="ch-tools-introduction-cross">
<?dbhtml filename="introduction.html"?>
<title>Introduction</title>
<para>This chapter shows how to build a minimal Linux system.
This system will contain just enough tools to start constructing the final
LFS system in <xref linkend="chapter-building-system"/> and allow a working
environment with more user convenience than a minimum environment would.</para>
<para>This chapter shows how to cross-compile basic utilities using
the just built cross-toolchain. Those utilities are installed into
their final location, but cannot be used yet. Basic tasks still rely on
the hosts tools. Nevertheless, the installed libraries are used when
linking.</para>
<para>Using the utilities will be possible in next chapter after entering
the <quote>chroot</quote> environment. But all the packages built in the
present chapter need themselves to be built. So we cannot be independent
on the build system yet.</para>
<para>Once again, let us recall that improper setting of <envar>LFS</envar>
together with building as root, may render your computer unusable.
This whole chapter must be done as user <systemitem
class="username">lfs</systemitem>, with the enviroment as described in
<xref linkend="ch-preps-settingenviron"/>.</para>
<para>There are two steps in building this minimal system. The first step
is to build a new and host-independent toolchain (compiler, assembler,
linker, libraries, and a few useful utilities). The second step uses this
toolchain to build the other essential tools.</para>
<!--
<para>The files compiled in this chapter will be installed under the
<filename class="directory">$LFS</filename> directory to keep them
separate from the files installed in the next chapter and the host
production directories. Since the packages compiled here are temporary,
we do not want them to pollute the soon-to-be LFS system.</para>
-->
</sect1>

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chapter07/chapter07.xml
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@ -11,6 +11,7 @@
<title>Entering Chroot and Building Additional Tools</title>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="introduction.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="changingowner.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="kernfs.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="chroot.xml"/>

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chapter07/introduction.xml
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@ -5,25 +5,33 @@
%general-entities;
]>
<sect1 id="ch-tools-introduction">
<sect1 id="ch-tools-introduction-chroot">
<?dbhtml filename="introduction.html"?>
<title>Introduction</title>
<para>This chapter shows how to build a minimal Linux system.
This system will contain just enough tools to start constructing the final
LFS system in <xref linkend="chapter-building-system"/> and allow a working
environment with more user convenience than a minimum environment would.</para>
<para>This chapter shows how to build the last missing bits of the
temporary system: first, the tools needed by the build machinery of
various packages, then three packages needed to run tests.
Now that all circular dependencies have been resolved,
we can use a <quote>chroot</quote> environment, completely isolated
from the computer used for the build, except for the running kernel.</para>
<para>For proper operation of the isolated environment, some communication
with the running kernel must be established. This is done through the
so-called <emphasis>Virtual Kernel File Systems</emphasis>, which must be
mounted when entering the chroot environment. You may want to check
that they are mounted by issuing <command>ls $LFS/dev</command>,
<command>ls $LFS/proc</command>, or <command>ls $LFS/sys</command>.
Note that mounting the virtual kernel file systems must be done
<emphasis>each time you want to enter the chroot
environment</emphasis>.</para>
<para>Until <xref linkend="ch-tools-chroot"/>, the commands must be
run as <systemitem class="username">root</systemitem>, with the
<envar>LFS</envar> variable set. After entering chroot, all commands
are run as root, fortunately without access to the OS of the computer
you build LFS on. Be careful anyway, as it is easy to destroy the whole
LFS system with badly formed commands.</para>
<para>There are two steps in building this minimal system. The first step
is to build a new and host-independent toolchain (compiler, assembler,
linker, libraries, and a few useful utilities). The second step uses this
toolchain to build the other essential tools.</para>
<!--
<para>The files compiled in this chapter will be installed under the
<filename class="directory">$LFS</filename> directory to keep them
separate from the files installed in the next chapter and the host
production directories. Since the packages compiled here are temporary,
we do not want them to pollute the soon-to-be LFS system.</para>
-->
</sect1>