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diff --git a/prologue/architecture.xml b/prologue/architecture.xml index d416780e4..915fad34d 100644 --- a/prologue/architecture.xml +++ b/prologue/architecture.xml @@ -10,41 +10,25 @@ <title>LFS Target Architectures</title> -<para>The primary target architectures of LFS are the AMD/Intel x86 (32-bit) -and x86_64 (64-bit) CPUs. On the other hand, the instructions in this book are -also known to work, with some modifications, with the Power PC and ARM CPUs. To -build a system that utilizes one of these alternative CPUs, the main prerequisite, in -addition to those on the next page, is an existing Linux system such as an -earlier LFS installation, Ubuntu, Red Hat/Fedora, SuSE, or some other distribution -that targets that architecture. (Note that a 32-bit -distribution can be installed and used as a host system on a 64-bit AMD/Intel -computer.)</para> - -<para>The gain from building on a 64-bit system, as -compared to a 32-bit system, is minimal. -For example, in a test build of LFS-9.1 on a Core i7-4790 CPU based system, -using 4 cores, the following statistics were measured:</para> - -<screen><computeroutput>Architecture Build Time Build Size -32-bit 239.9 minutes 3.6 GB -64-bit 233.2 minutes 4.4 GB</computeroutput></screen> - -<para>As you can see, on the same hardware, the 64-bit build is only 3% faster -(and 22% larger) than the 32-bit build. If you plan to use LFS as a LAMP -server, or a firewall, a 32-bit CPU may be good enough. On the other -hand, several packages in BLFS now need more than 4 GB of RAM to be built -and/or to run; if you plan to use LFS as a desktop, the LFS authors -recommend building a 64-bit system.</para> - -<para>The default 64-bit build that results from LFS is a -<quote>pure</quote> 64-bit system. That is, it supports 64-bit executables -only. Building a <quote>multi-lib</quote> system requires compiling many +<para>The target architectures of this LFS edition are ARM64 (sometimes +called AArch64) CPUs. On the other hand, the instructions in this book may +work on 32-bit ARM CPUs with some modifications. To build a system that +utilizes one of these alternative CPUs, the main prerequisite, in +addition to those on +the next page, is an existing Linux system such as an earlier LFS +installation, Ubuntu, Red Hat/Fedora, SuSE, or other distribution that +targets the architecture that you have.</para> + +<para>The build results from this LFS edition is considered a +<quote>pure</quote> 64-bit system. That is, it supports 64-bit executables +only. Building a <quote>multi-lib</quote> system requires compiling many applications twice, once for a 32-bit system and once for a 64-bit system. This is not directly supported in LFS because it would interfere with the educational objective of providing the minimal instructions needed for a -basic Linux system. Some of the LFS/BLFS editors maintain a multilib fork +base Linux system. Some LFS/BLFS editors maintain a multilib fork of LFS, accessible at <ulink url="https://www.linuxfromscratch.org/~thomas/multilib/index.html"/>. But -that's an advanced topic.</para> +the multilib edition is for x86_64, and multilib is an advanced topic +anyway.</para> </sect1> |