| 1 | <sect2><title> </title><para> </para></sect2>
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| 2 |
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| 3 | <sect2>
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| 4 | <title>Installation of the kernel</title>
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| 5 |
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| 6 | <para>Building the kernel involves a few steps: configuration,
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| 7 | compilation, and installation. If you don't like the way this
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| 8 | book configures the kernel, view the <filename>README</filename>
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| 9 | file in the kernel source tree for alternative methods.</para>
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| 10 |
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| 11 | <para>Prepare for compilation by running the following command:</para>
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| 12 |
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| 13 | <para><screen><userinput>make mrproper</userinput></screen></para>
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| 14 |
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| 15 | <para>This ensures that the kernel tree is absolutely clean. The kernel
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| 16 | team recommends that this command be issued prior to
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| 17 | <emphasis>each</emphasis> kernel compilation. You shouldn't rely
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| 18 | on the source tree being clean after untarring.</para>
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| 19 |
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| 20 | <para>Configure the kernel via a menu-driven interface:</para>
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| 21 |
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| 22 | <para><screen><userinput>make menuconfig</userinput></screen></para>
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| 23 |
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| 24 | <para><userinput>make oldconfig</userinput> may be more appropriate
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| 25 | in some situations. See the <filename>README</filename> file for
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| 26 | more information.</para>
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| 27 |
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| 28 | <para>If you wish, you may skip kernel configuration by copying the
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| 29 | kernel config file, <filename>.config</filename>, from your host
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| 30 | system to the
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| 31 | <filename class="directory">$LFS/usr/src/linux-&kernel-version;</filename>
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| 32 | directory.</para>
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| 33 |
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| 34 | <para>It's important to note that to be compliant with Posix shared memory
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| 35 | requirements, we must enable the tmpfs filesystem option, and mount a tmpfs
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| 36 | filesystem at /dev/shm.</para>
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| 37 |
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| 38 | <para>Verify dependencies and create dependency information files:</para>
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| 39 |
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| 40 | <para><screen><userinput>make CC=/opt/gcc-2.95.3/bin/gcc dep</userinput></screen></para>
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| 41 |
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| 42 | <para>Compile the kernel image:</para>
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| 43 |
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| 44 | <para><screen><userinput>make CC=/opt/gcc-2.95.3/bin/gcc bzImage</userinput></screen></para>
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| 45 |
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| 46 | <para>Compile the drivers which have been configured as modules:</para>
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| 47 |
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| 48 | <para><screen><userinput>make CC=/opt/gcc-2.95.3/bin/gcc modules</userinput></screen></para>
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| 49 |
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| 50 | <para>If you intend to use kernel modules, you will need an
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| 51 | <filename>/etc/modules.conf</filename> file. Information pertaining
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| 52 | to modules and to kernel configuration in general may be found in the
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| 53 | kernel documentation, which is stored stored in
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| 54 | <filename>/usr/src/linux-&kernel-version;/Documentation</filename>. The
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| 55 | modules.conf man page and the kernel HOWTO at
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| 56 | <ulink url="&tldp-root;HOWTO/Kernel-HOWTO.html"/> may also be of
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| 57 | interest to you.</para>
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| 58 |
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| 59 | <para>Install the modules:</para>
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| 60 |
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| 61 | <para><screen><userinput>make CC=/opt/gcc-2.95.3/bin/gcc modules_install</userinput></screen></para>
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| 62 |
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| 63 | <para>Kernel compilation has finished, but some of the files created
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| 64 | still reside in the source tree. To complete the installation, two
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| 65 | files should to be copied to the <filename>/boot</filename>
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| 66 | directory.</para>
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| 67 |
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| 68 | <para>The path to the kernel file may vary depending on the platform
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| 69 | you're using. Issue the following command to install the kernel:</para>
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| 70 |
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| 71 | <para><screen><userinput>cp arch/i386/boot/bzImage /boot/lfskernel</userinput></screen></para>
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| 72 |
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| 73 | <para><filename>System.map</filename> is a symbol file for the kernel.
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| 74 | It maps the function entrypoints of every function in the kernel API,
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| 75 | as well as the addresses of the kernel data structures for the running
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| 76 | kernel. Issue the following command to install the map file:</para>
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| 77 |
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| 78 | <para><screen><userinput>cp System.map /boot</userinput></screen></para>
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| 79 |
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| 80 | </sect2>
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