[bf8c11f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" |
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/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-intro-how"> |
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| 9 | <?dbhtml filename="how.html"?> |
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| 10 | |
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| 11 | <title>How to Build an LFS System</title> |
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| 12 | |
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| 13 | <para>The LFS system will be built by using a previously installed |
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| 14 | Linux distribution (such as Debian, Mandrake, Red Hat, or SuSE). This |
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| 15 | existing Linux system (the host) will be used as a starting point to |
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| 16 | provide necessary programs, including a compiler, linker, and shell, |
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| 17 | to build the new system. Select the <quote>development</quote> option |
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| 18 | during the distribution installation to be able to access these |
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| 19 | tools.</para> |
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| 20 | |
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| 21 | <para>As an alternative to installing an entire separate distribution |
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| 22 | onto your machine, and if your host machine is x86 based, you may wish to |
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| 23 | use the Linux From Scratch LiveCD. The CD works well as a host system, |
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| 24 | providing all the tools you need to successfully follow the instructions |
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| 25 | in this book. Additionally, it contains all the source packages, patches |
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| 26 | and a copy of this book. So once you have the CD, no network connection |
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| 27 | or additional downloads are necessary. For more information about the |
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| 28 | LFS LiveCD or to download a copy, visit <ulink url="&livecd-root;"/></para> |
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| 29 | |
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| 30 | <!-- --> |
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[ed3e5d8] | 31 | <para>THE TEXT BELOW NEEDS TO BE REWRITTEN</para> |
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[bf8c11f] | 32 | |
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| 33 | <para><xref linkend="chapter-partitioning"/> of this book describes how |
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| 34 | to create a new Linux native partition and file system, the place |
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| 35 | where the new LFS system will be compiled and installed. <xref |
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| 36 | linkend="chapter-getting-materials"/> explains which packages and |
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| 37 | patches need to be downloaded to build an LFS system and how to store |
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| 38 | them on the new file system. <xref linkend="chapter-final-preps"/> |
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| 39 | discusses the setup for an appropriate working environment. Please read |
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| 40 | <xref linkend="chapter-final-preps"/> carefully as it explains several |
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| 41 | important issues the developer should be aware of before beginning to |
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[ed3e5d8] | 42 | work through <xref linkend="chapter-cross-tools"/> and |
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[bf8c11f] | 43 | beyond.</para> |
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| 44 | |
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[5be6331] | 45 | <para><xref linkend="chapter-temp-system"/> explains the |
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[bf8c11f] | 46 | installation of a number of packages that will form the basic |
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| 47 | development suite (or toolchain) which is used to build the actual |
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| 48 | system in <xref linkend="chapter-building-system"/>. Some of these |
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| 49 | packages are needed to resolve circular dependencies—for example, |
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| 50 | to compile a compiler, you need a compiler.</para> |
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| 51 | |
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[5be6331] | 52 | <para><xref linkend="chapter-temp-system"/> also shows the user |
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[bf8c11f] | 53 | how to build a first pass of the toolchain, including Binutils and GCC |
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| 54 | (first pass basically means these two core packages will be re-installed |
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| 55 | a second time). The next step is to build Glibc, the C library. Glibc |
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| 56 | will be compiled by the toolchain programs built in the first pass. Then, |
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| 57 | a second pass of the toolchain will be built. This time, the toolchain |
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| 58 | will be dynamically linked against the newly built Glibc. The remaining |
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[5be6331] | 59 | <xref linkend="chapter-temp-system"/> packages are built using this |
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[bf8c11f] | 60 | second pass toolchain. When this is done, the LFS installation process |
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| 61 | will no longer depend on the host distribution, with the exception of the |
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| 62 | running kernel. </para> |
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| 63 | |
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| 64 | <para>This effort to isolate the new system from the host distribution |
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| 65 | may seem excessive, but a full technical explanation is provided at the |
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[5be6331] | 66 | beginning of <xref linkend="chapter-temp-system"/>.</para> |
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[bf8c11f] | 67 | |
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| 68 | <para>In <xref linkend="chapter-building-system"/>, the full LFS system is |
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| 69 | built. The <command>chroot</command> (change root) program is used to enter |
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| 70 | a virtual environment and start a new shell whose root directory will be set |
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| 71 | to the LFS partition. This is very similar to rebooting and instructing the |
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| 72 | kernel to mount the LFS partition as the root partition. The system does not |
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| 73 | actually reboot, but instead <command>chroot</command>'s because creating a |
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| 74 | bootable system requires additional work which is not necessary just yet. |
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| 75 | The major advantage is that <quote>chrooting</quote> allows the builder to |
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| 76 | continue using the host while LFS is being built. While waiting for package |
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| 77 | compilation to complete, a user can switch to a different virtual console |
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| 78 | (VC) or X desktop and continue using the computer as normal.</para> |
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| 79 | |
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| 80 | <para>To finish the installation, the LFS-Bootscripts are set up in <xref |
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| 81 | linkend="chapter-bootscripts"/>, and the kernel and boot loader are set |
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| 82 | up in <xref linkend="chapter-bootable"/>. <xref |
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| 83 | linkend="chapter-finalizing"/> contains information on furthering the |
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| 84 | LFS experience beyond this book. After the steps in this book have |
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| 85 | been implemented, the computer will be ready to reboot into the new |
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| 86 | LFS system.</para> |
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| 87 | <!-- --> |
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| 88 | |
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| 89 | <para>This is the process in a nutshell. Detailed information on each |
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| 90 | step is discussed in the following chapters and package descriptions. |
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| 91 | Items that may seem complicated will be clarified, and everything will |
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| 92 | fall into place as the reader embarks on the LFS adventure.</para> |
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| 93 | |
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| 94 | </sect1> |
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