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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2954 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
85 lines
3.0 KiB
XML
85 lines
3.0 KiB
XML
<sect1 id="ch08-grub">
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<title>Making the LFS system bootable</title>
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<?dbhtml filename="grub.html" dir="chapter08"?>
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<para>Now that we have our shiny new Linux-From-Scratch system completed,
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we need to ensure we can boot it. To do this, we will run the
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<userinput>grub</userinput> program.</para>
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<para><screen><userinput>grub</userinput></screen></para>
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<para>Grub uses its own naming structure for drives and partitions, in the form
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of (hdn,m), where <emphasis>n</emphasis> is the hard drive number, and
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<emphasis>m</emphasis> the partition number, both starting from zero. This
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means, for instance, that partition <filename>hda1</filename> is (hd0,0) to
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Grub, and <filename>hdb2</filename> is (hd1,1). In contrast to Linux, Grub
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doesn't consider CD-ROM drives to be hard drives, so if you have a CD on
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<filename>hdb</filename>, for example, and a second hard drive on
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<filename>hdc</filename>, that second hard drive would still be (hd1).</para>
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<para>Using the above information, determine the appropriate designator for
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your root partition. For the folowing example, we'll assume your root partition
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is <filename>hda4</filename>.</para>
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<para>First, tell Grub where to search for its <filename>stage{1,2}</filename>
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files -- you can use Tab everywhere to make Grub show the alternatives:</para>
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<para><screen><userinput>root (hd0,3)</userinput></screen></para>
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<para>Then tell it to install itself into the MBR (Master Boot Record) of
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<filename>hda</filename>:</para>
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<para><screen><userinput>setup (hd0)</userinput></screen></para>
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<para>If all is well, Grub will have reported finding its files in
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<filename>/boot/grub</filename>. That's all there was to it:</para>
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<para><screen><userinput>quit</userinput></screen></para>
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<para>Now we need to create the <filename>menu.lst</filename> file, which
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defines Grub's boot menu:</para>
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<para><screen><userinput>cat > /boot/grub/menu.lst << "EOF"</userinput>
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# Begin /boot/grub/menu.lst
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# By default boot the first menu entry.
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default 0
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# Allow 30 seconds before booting the default.
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timeout 30
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# Use prettier colors.
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color green/black light-green/black
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# The first entry is for LFS.
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title LFS 5.0
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root (hd0,3)
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kernel /boot/lfskernel root=/dev/hda4 ro
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<userinput>EOF</userinput></screen></para>
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<para>You may want to add an entry for your host distribution. It might look
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like this:</para>
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<para><screen><userinput>cat >> /boot/grub/menu.lst << "EOF"</userinput>
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title Red Hat
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root (hd0,2)
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kernel /boot/kernel-2.4.20 root=/dev/hda3 ro
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initrd /boot/initrd-2.4.20
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<userinput>EOF</userinput></screen></para>
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<para>Also, if you happen to dual-boot Windows, the following entry should
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allow booting it:</para>
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<para><screen><userinput>cat >> /boot/grub/menu.lst << "EOF"</userinput>
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title Windows
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rootnoverify (hd0,0)
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chainloader +1
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<userinput>EOF</userinput></screen></para>
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<para>If <userinput>info grub</userinput> doesn't tell you all you want to
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know, you can find more information regarding Grub on its website, located at:
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<ulink url="http://www.gnu.org/software/grub"/>.</para>
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</sect1>
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