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arm64: start branch

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Xi Ruoyao 2022-08-24 22:35:14 +08:00
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git-version.sh
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@ -48,7 +48,7 @@ esac
full_date="$month $day$suffix, $year" full_date="$month $day$suffix, $year"
sha="$(git describe --abbrev=1)" sha="$(git describe --abbrev=1)"
rev=$(echo "$sha" | sed 's/-g[^-]*$//') rev=arm64-$(echo "$sha" | sed 's/-g[^-]*$//')
version="$rev" version="$rev"
versiond="$rev-systemd" versiond="$rev-systemd"

43
prologue/architecture.xml
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@ -10,41 +10,24 @@
<title>LFS Target Architectures</title> <title>LFS Target Architectures</title>
<para>The primary target architectures of LFS are the AMD/Intel x86 (32-bit) <para>The target architectures of this LFS edition are ARM64 (sometimes
and x86_64 (64-bit) CPUs. On the other hand, the instructions in this book are called AArch64) CPUs. On the other hand, the instructions in this book may
also known to work, with some modifications, with the Power PC and ARM CPUs. To work on 32-bit ARM CPUs with some modifications. To build a system that
build a system that utilizes one of these CPUs, the main prerequisite, in utilizes one of these CPUs, the main prerequisite, in addition to those on
addition to those on the next page, is an existing Linux system such as an the next page, is an existing Linux system such as an earlier LFS
earlier LFS installation, Ubuntu, Red Hat/Fedora, SuSE, or other distribution installation, Ubuntu, Red Hat/Fedora, SuSE, or other distribution that
that targets the architecture that you have. Also note that a 32-bit targets the architecture that you have.</para>
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 <para>The build results from this LFS edition is considered a
compared to a 32-bit system is minimal. <quote>pure</quote> 64-bit system. That is, it supports 64-bit executables
For example, in a test build of LFS-9.1 on a Core i7-4790 CPU based system, only. Building a <quote>multi-lib</quote> system requires compiling many
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
applications twice, once for a 32-bit system and once for a 64-bit system. 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 This is not directly supported in LFS because it would interfere with the
educational objective of providing the instructions needed for a educational objective of providing the instructions needed for a
straightforward base Linux system. Some LFS/BLFS editors maintain a fork straightforward base Linux system. Some LFS/BLFS editors maintain a fork
of LFS for multilib, which is accessible at <ulink of LFS for multilib, which is accessible at <ulink
url="https://www.linuxfromscratch.org/~thomas/multilib/index.html"/>. But it url="https://www.linuxfromscratch.org/~thomas/multilib/index.html"/>. But
is an advanced topic.</para> the multilib edition is for x86_64, and multilib is an advanced topic
anyway.</para>
</sect1> </sect1>