arm64: start branch

1 files changed, 14 insertions, 31 deletions

diff --git a/prologue/architecture.xml b/prologue/architecture.xml
index ca240183c..c2bc6f11f 100644
--- a/prologue/architecture.xml
+++ b/prologue/architecture.xml
@@ -10,41 +10,24 @@
 
   <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 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. Also note that a 32-bit
-distribution can be installed and used as a host system on a 64-bit AMD/Intel
-computer.</para>
-
-<para>For building LFS, the gain of building on a 64-bit system
-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 is 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 largely sufficient. On the other
-hand, several packages in BLFS now need more than 4GB of RAM to be built
-and/or to run, so that if you plan to use LFS as a desktop, the LFS authors
-recommend building on a 64-bit system.</para>
-
-<para>The default 64-bit build that results from LFS 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
+<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 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 instructions needed for a
 straightforward base Linux system. Some LFS/BLFS editors maintain a fork
 of LFS for multilib, which is accessible at <ulink
-url="https://www.linuxfromscratch.org/~thomas/multilib/index.html"/>. But it
-is an advanced topic.</para>
+url="https://www.linuxfromscratch.org/~thomas/multilib/index.html"/>. But
+the multilib edition is for x86_64, and multilib is an advanced topic
+anyway.</para>
 
 </sect1>