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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2793 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
66 lines
3.4 KiB
XML
66 lines
3.4 KiB
XML
<sect1 id="ch01-how">
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<title>How things are going to be done</title>
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<?dbhtml filename="how.html" dir="chapter01"?>
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<para>You are going to build the LFS system by using a previously installed
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Linux distribution such as Debian, Mandrake, Red Hat, etc.
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The existing Linux system will be used as a starting point, because you
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will need tools like a compiler, linker, text editor, and other development
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tools to build the system. Ordinarily, the required tools are available by
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default if you selected "development" as one of your installation options
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when you installed your Linux distribution.</para>
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<para>After you have downloaded the packages that make up an LFS system,
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you will create a new Linux native partition and filesystem. Here is where
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the LFS system will be compiled and installed onto.</para>
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<para>The next step, Chapter 5, will discuss the installation of a number
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of packages that will form the basic development suite which is used to
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build the actual system. Some of these packages are needed to resolve
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circular dependencies. For example, to compile a compiler you need a
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compiler.</para>
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<para>The first thing that will be done in Chapter 5 is building the
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toolchain, which is made up of Binutils, GCC and Glibc. The programs from
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these packages will be linked statically in order for them to be
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independant of the host system.</para>
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<para>When the first toolchain is built, you will rebuild those three
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packages again, this time using the toolchain we just built, rather than
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the host system's toolchain. In particular, all programs will be linked
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against the new Glibc rather than the host system's Glibc. All subsequent
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packages in Chapter 5 will be built and linked using this second toolchain
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installation. When this is done (building the second toolchain), the LFS
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installation process will no longer depend on the host distribution, with
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the exception of the running kernel.</para>
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<para>In Chapter 6 the real LFS system will be built. The
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chroot (change root) program is used to enter a virtual environment and
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start a new shell whose root directory will be set to the LFS partition.
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This is very similar to rebooting and instructing the kernel to mount the
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LFS partition as the root partition. The reason that you don't actually
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reboot, but instead chroot, is that creating a bootable system requires
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additional work which isn't necessary. As well, chrooting allows you
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to continue using the host while LFS is being built. While software is
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being installed you can simply switch to a different VC (Virtual Console)
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or X desktop and continue using the computer as you normally would.</para>
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<para>When all the software from Chapter 6 is installed, the temporary
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tools built in Chapter 5 will be removed. Chapters 7, 8 and 9 will finalize
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the installation. The bootscripts are setup in Chapter 7, the kernel and
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boot loader are setup in Chapter 8 and Chapter 9 has some pointers to help
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you after you finish with the book. Then, finally, you reboot the system
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into the new LFS system.</para>
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<para>This is the process in a nutshell. Detailed information on the steps
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you will take are discussed in the chapters and package descriptions as you
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progress through them. If something isn't completely clear now, don't
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worry, everything will fall into place soon.</para>
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<para>Please read Chapter 2 carefully as it explains a few important things
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you should be aware of before you begin to work through Chapters 5 and
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beyond.</para>
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</sect1>
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