| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/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-temp-system-choose">
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| 9 | <?dbhtml filename="choose.html"?>
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| 10 |
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| 11 | <title>To Boot or to Chroot?</title>
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| 12 |
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| 13 | <para os="a"> There are two different ways you can proceed from this point
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| 14 | to build the final system. You can build a kernel, a bootloader, and
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| 15 | a few other utilities, boot into the temporary system, and build the
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| 16 | rest there. Alternatively, you can chroot into the temporary system.</para>
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| 17 |
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| 18 | <para os="b">The boot method is needed when you are building on a different
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| 19 | architecture. For example, if you are building a PowerPC system from
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| 20 | an x86, you can't chroot. The chroot method is for when you are
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| 21 | building on the same architecture. If you are building on, and for,
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| 22 | an x86 system, you can simply chroot. The rule of thumb here is if
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| 23 | the architectures match and you are running the same series kernel
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| 24 | you can just chroot. If you aren't running the same series kernel, or are
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| 25 | wanting to run a different ABI, you will need to use the boot option.</para>
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| 26 |
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| 27 | <para os="c">If you are in any doubt about this, you can try the following
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| 28 | commands to see if you can chroot:</para>
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| 29 |
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| 30 | <screen ><userinput>/tools/lib/libc.so.6
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| 31 | /tools/bin/gcc -v</userinput></screen>
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| 32 |
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| 33 | <para>If either of these commands fail, you will have to follow the boot
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| 34 | method.</para>
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| 35 |
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| 36 | <para>To chroot, you will also need a Linux Kernel-2.6.x (having been
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| 37 | compiled with GCC-3.0 or greater). The reason for the kernel version
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| 38 | requirement is that, without it, thread-local storage support in Binutils
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| 39 | will not be built and the Native POSIX Threading Library (NPTL) test suite
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| 40 | will segfault.</para>
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| 41 |
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| 42 | <para>To check your kernel version, run <command>cat /proc/version</command>
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| 43 | - if it does not say that you are running a 2.6.2 or later Linux kernel,
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| 44 | compiled with GCC 3.0 or later, you cannot chroot.</para>
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| 45 |
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| 46 | <para os="e">For the boot method, follow <xref linkend="chapter-boot"/>.</para>
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| 47 |
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| 48 | <para os="f">For the chroot method, follow <xref linkend="chapter-chroot"/>.</para>
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| 49 |
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| 50 | </sect1>
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