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<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE sections SYSTEM "/dtd/book.dtd">
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<!-- The content of this document is licensed under the CC-BY-SA license -->
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<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
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<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-alpha-kernel.xml,v 1.44 2007/08/13 03:31:27 nightmorph Exp $ -->
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<sections>
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<version>8.4</version>
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<date>2008-01-12</date>
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<section>
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<title>Timezone</title>
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<body>
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<p>
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You first need to select your timezone so that your system knows where it is
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located. Look for your timezone in <path>/usr/share/zoneinfo</path>, then copy
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it to <path>/etc/localtime</path>. Please avoid the
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<path>/usr/share/zoneinfo/Etc/GMT*</path> timezones as their names do not
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indicate the expected zones. For instance, <path>GMT-8</path> is in fact
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GMT+8.
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</p>
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<pre caption="Setting the timezone information">
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# <i>ls /usr/share/zoneinfo</i>
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<comment>(Suppose you want to use GMT)</comment>
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# <i>cp /usr/share/zoneinfo/GMT /etc/localtime</i>
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</pre>
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</body>
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</section>
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<section>
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<title>Installing the Sources</title>
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<subsection>
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<title>Choosing a Kernel</title>
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<body>
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<p>
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The core around which all distributions are built is the Linux kernel. It is the
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layer between the user programs and your system hardware. Gentoo provides its
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users several possible kernel sources. A full listing with description is
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available at the <uri link="/doc/en/gentoo-kernel.xml">Gentoo Kernel
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Guide</uri>.
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</p>
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<p>
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For alpha-based systems we have <c>gentoo-sources</c> (the default 2.6 kernel
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source).
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</p>
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<pre caption="Installing a kernel source">
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# <i>emerge gentoo-sources</i>
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</pre>
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<p>
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When you take a look in <path>/usr/src</path> you should see a symlink called
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<path>linux</path> pointing to your kernel source. In this case, the installed
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kernel source points to <c>gentoo-sources-<keyval id="kernel-version"/></c>.
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Your version may be different, so keep this in mind.
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</p>
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<pre caption="Viewing the kernel source symlink">
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# <i>ls -l /usr/src/linux</i>
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lrwxrwxrwx 1 root root 12 Oct 13 11:04 /usr/src/linux -> linux-<keyval id="kernel-version"/>
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</pre>
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<p>
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Now it is time to configure and compile your kernel source. You can use
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<c>genkernel</c> for this, which will build a generic kernel as used by the
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Installation CD. We explain the "manual" configuration first though, as it is
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the best way to optimize your environment.
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</p>
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<p>
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If you want to manually configure your kernel, continue now with <uri
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link="#manual">Default: Manual Configuration</uri>. If you want to use
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<c>genkernel</c> you should read <uri link="#genkernel">Alternative: Using
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genkernel</uri> instead.
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</p>
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</body>
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</subsection>
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</section>
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<section id="manual">
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<title>Default: Manual Configuration</title>
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<subsection>
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<title>Introduction</title>
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<body>
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<p>
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Manually configuring a kernel is often seen as the most difficult procedure a
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Linux user ever has to perform. Nothing is less true -- after configuring a
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couple of kernels you don't even remember that it was difficult ;)
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</p>
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<p>
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However, one thing <e>is</e> true: you must know your system when you start
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configuring a kernel manually. Most information can be gathered by emerging
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pciutils (<c>emerge pciutils</c>) which contains <c>lspci</c>. You will now
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be able to use <c>lspci</c> within the chrooted environment. You may safely
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ignore any <e>pcilib</e> warnings (like pcilib: cannot open
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/sys/bus/pci/devices) that <c>lspci</c> throws out. Alternatively, you can run
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<c>lspci</c> from a <e>non-chrooted</e> environment. The results are the same.
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You can also run <c>lsmod</c> to see what kernel modules the Installation CD
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uses (it might provide you with a nice hint on what to enable).
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</p>
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<p>
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Now go to your kernel source directory and execute <c>make menuconfig</c>. This
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will fire up an ncurses-based configuration menu.
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</p>
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<pre caption="Invoking menuconfig">
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# <i>cd /usr/src/linux</i>
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# <i>make menuconfig</i>
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</pre>
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<p>
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You will be greeted with several configuration sections. We'll first list some
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options you must activate (otherwise Gentoo will not function, or not function
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properly without additional tweaks).
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</p>
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</body>
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</subsection>
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<subsection>
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<title>Activating Required Options</title>
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<body>
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<p>
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First of all, activate the use of development and experimental code/drivers.
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You need this, otherwise some very important code/drivers won't show up:
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</p>
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<pre caption="Selecting experimental code/drivers">
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General setup --->
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[*] Prompt for development and/or incomplete code/drivers
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</pre>
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<p>
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Now go to <c>File Systems</c> and select support for the filesystems you use.
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<e>Don't</e> compile them as modules, otherwise your Gentoo system will not be
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able to mount your partitions. Also select <c>Virtual memory</c> and <c>/proc
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file system</c>.
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</p>
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<pre caption="Selecting necessary file systems">
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File systems --->
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Pseudo Filesystems --->
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[*] /proc file system support
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[*] Virtual memory file system support (former shm fs)
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<comment>(Select one or more of the following options as needed by your system)</comment>
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<*> Reiserfs support
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<*> Ext3 journalling file system support
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<*> JFS filesystem support
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<*> Second extended fs support
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<*> XFS filesystem support
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</pre>
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<p>
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If you are using PPPoE to connect to the Internet or you are using a dial-up
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modem, you will need the following options in the kernel:
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</p>
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<pre caption="Selecting PPPoE necessary drivers">
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Device Drivers --->
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Networking support --->
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<*> PPP (point-to-point protocol) support
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<*> PPP support for async serial ports
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<*> PPP support for sync tty ports
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</pre>
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<p>
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The two compression options won't harm but are not definitely needed, neither
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does the <c>PPP over Ethernet</c> option, that might only be used by <c>ppp</c>
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when configured to do kernel mode PPPoE.
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</p>
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<p>
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If you require it, don't forget to include support in the kernel for your
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ethernet card.
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</p>
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<p>
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The following options are recommended as well:
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</p>
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<pre caption="Recommended Alpha options">
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General setup --->
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<*> SRM environment through procfs
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<*> Configure uac policy via sysctl
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Plug and Play configuration --->
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<*> Plug and Play support
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<M> ISA Plug and Play support
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SCSI support --->
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SCSI low-level drivers --->
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<*> SYM53C8XX Version 2 SCSI support (NEW)
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<*> Qlogic ISP SCSI support
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Network device support --->
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Ethernet (10 or 100 Mbit) --->
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<M> DECchip Tulip (dc21x4x) PCI support
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<M> Generic DECchip & DIGITAL EtherWORKS PCI/EISA
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<M> EtherExpressPro/100 support (eepro100)
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<M> EtherExpressPro/100 support (e100)
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Ethernet (1000 Mbit) --->
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<M> Alteon AceNIC
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[*] Omit support for old Tigon I
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<M> Broadcom Tigon3
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[*] FDDI driver support
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<M> Digital DEFEA and DEFPA
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<*> PPP support
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<*> PPP Deflate compression
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Character devices --->
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[*] Support for console on serial port
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[*] Direct Rendering Manager
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File systems --->
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<*> Kernel automounter version 4 support
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Network File Systems --->
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<*> NFS
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[*] NFSv3 client
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<*> NFS server
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[*] NFSv3 server
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Partition Types --->
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[*] Advanced partition selection
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[*] Alpha OSF partition support
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Native Language Support
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<*> NLS ISO 8859-1
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Sound --->
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<M> Sound card support
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<M> OSS sound modules
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[*] Verbose initialisation
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[*] Persistent DMA buffers
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<M> 100% Sound Blaster compatibles
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</pre>
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<p>
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When you've finished configuring the kernel, continue with <uri
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link="#compiling">Compiling and Installing</uri>.
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</p>
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</body>
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</subsection>
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<subsection id="compiling">
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<title>Compiling and Installing</title>
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<body>
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<p>
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Now that your kernel is configured, it is time to compile and install it. Exit
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the configuration and start the compilation process:
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</p>
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<pre caption="Compiling the kernel">
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# <i>make && make modules_install</i>
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# <i>make boot</i>
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</pre>
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<p>
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When the kernel has finished compiling, copy the kernel image to
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<path>/boot</path>. Recent kernels might create <path>vmlinux</path> instead of
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<path>vmlinux.gz</path>. Keep this in mind when you copy your kernel image.
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</p>
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<pre caption="Installing the kernel">
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# <i>cp arch/alpha/boot/vmlinux.gz /boot/</i>
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</pre>
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<p>
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Now continue with <uri link="#kernel_modules">Installing Separate Kernel
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Modules</uri>.
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</p>
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</body>
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</subsection>
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</section>
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<section id="genkernel">
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<title>Alternative: Using genkernel</title>
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<body>
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<p>
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If you are reading this section, you have chosen to use our <c>genkernel</c>
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script to configure your kernel for you.
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</p>
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<p>
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Now that your kernel source tree is installed, it's now time to compile your
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kernel by using our <c>genkernel</c> script to automatically build a kernel for
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you. <c>genkernel</c> works by configuring a kernel nearly identically to the
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way our Installation CD kernel is configured. This means that when you use
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<c>genkernel</c> to build your kernel, your system will generally detect all
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your hardware at boot-time, just like our Installation CD does. Because
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genkernel doesn't require any manual kernel configuration, it is an ideal
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solution for those users who may not be comfortable compiling their own
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kernels.
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</p>
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<p>
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Now, let's see how to use genkernel. First, emerge the genkernel ebuild:
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</p>
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<pre caption="Emerging genkernel">
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# <i>emerge genkernel</i>
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</pre>
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<p>
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Now, compile your kernel sources by running <c>genkernel all</c>.
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Be aware though, as <c>genkernel</c> compiles a kernel that supports almost all
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hardware, this compilation will take quite a while to finish!
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</p>
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<p>
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Note that, if your boot partition doesn't use ext2 or ext3 as filesystem you
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need to manually configure your kernel using <c>genkernel --menuconfig all</c>
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and add support for your filesystem <e>in</e> the kernel (i.e. <e>not</e> as a
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module).
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</p>
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<pre caption="Running genkernel">
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# <i>genkernel all</i>
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</pre>
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<p>
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Once <c>genkernel</c> completes, a kernel, full set of modules and <e>initial
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root disk</e> (initrd) will be created. We will use the kernel and initrd when
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configuring a boot loader later in this document. Write down the names of the
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kernel and initrd as you will need it when writing the bootloader configuration
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file. The initrd will be started immediately after booting to perform hardware
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autodetection (just like on the Installation CD) before your "real" system
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starts up.
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</p>
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<pre caption="Checking the created kernel image name and initrd">
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# <i>ls /boot/kernel* /boot/initramfs-*</i>
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</pre>
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</body>
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</section>
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<section id="kernel_modules">
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<title>Installing Separate Kernel Modules</title>
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<subsection>
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<title>Configuring the Modules</title>
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<body>
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<p>
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You should list the modules you want automatically loaded in
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<path>/etc/modules.autoload.d/kernel-2.6</path>. You can add extra options to
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the modules too if you want.
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</p>
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<p>
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To view all available modules, run the following <c>find</c> command. Don't
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forget to substitute "<kernel version>" with the version of the kernel you
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just compiled:
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</p>
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<pre caption="Viewing all available modules">
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# <i>find /lib/modules/<kernel version>/ -type f -iname '*.o' -or -iname '*.ko'</i>
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</pre>
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<p>
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For instance, to automatically load the <c>3c59x.ko</c> module, edit the
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<path>kernel-2.6</path> file and enter the module name in it.
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</p>
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<pre caption="Editing /etc/modules.autoload.d/kernel-2.6">
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# <i>nano -w /etc/modules.autoload.d/kernel-2.6</i>
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</pre>
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<pre caption="/etc/modules.autoload.d/kernel-2.6">
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3c59x
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</pre>
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<p>
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Continue the installation with <uri link="?part=1&chap=8">Configuring
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your System</uri>.
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</p>
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</body>
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</subsection>
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</section>
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</sections>
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