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study/boot/Bootdisk-HOWTO/Bootdisk-HOWTO-v450/x688.html
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study/boot/Bootdisk-HOWTO/Bootdisk-HOWTO-v450/x688.html
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<HTML
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><HEAD
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><TITLE
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>Choosing a kernel</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.63
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"><LINK
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REL="HOME"
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TITLE="The Linux Bootdisk HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Building a root filesystem"
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HREF="buildroot.html"><LINK
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REL="NEXT"
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TITLE="Putting them together: Making the diskette(s)"
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HREF="x703.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>The Linux Bootdisk HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="buildroot.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x703.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN688"
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>5. Choosing a kernel</A
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></H1
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><P
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>At this point you have a complete compressed root filesystem. The next step
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is to build or select a kernel. In most cases it would be possible to copy
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your current kernel and boot the diskette from that. However, there may be
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cases where you wish to build a separate one.</P
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><P
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>One reason is size. If you are building a single boot/root diskette, the
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kernel will be one of the largest files on the diskette so you will have to
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reduce the size of the kernel as much as possible. To reduce kernel size,
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build it with the minumum set of facilities necessary to support the desired
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system. This means leaving out everything you don't need. Networking is a
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good thing to leave out, as well as support for any disk drives and other
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devices which you don't need when running your boot/root system. As stated
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before, your kernel <EM
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>must</EM
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> have ramdisk and ext2 support
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built into it.</P
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><P
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> Having worked out a minimum set of facilities to include in a kernel,
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you then need to work out what to add back in. Probably the most common uses
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for a boot/root diskette system would be to examine and restore a corrupted
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root file system, and to do this you may need kernel support. For example, if
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your backups are all held on tape using Ftape to access your tape drive, then,
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if you lose your current root drive and drives containing Ftape, then you will
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not be able to restore from your backup tapes. You will have to reinstall
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Linux, download and reinstall <B
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CLASS="COMMAND"
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>ftape</B
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>, and then try to read
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your backups.</P
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><P
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>The point here is that, whatever I/O support you have added to your kernel to
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support backups should also be added into your boot/root kernel.</P
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><P
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>The procedure for actually building the kernel is described in the
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documentation that comes with the kernel. It is quite easy to follow, so
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start by looking in <TT
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CLASS="FILENAME"
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>/usr/src/linux</TT
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>. If you have trouble
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building a kernel, you should probably not attempt to build boot/root
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systems anyway. Remember to compress the kernel with ``<B
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CLASS="COMMAND"
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>make zImage</B
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>''.</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="buildroot.html"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="x703.html"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Building a root filesystem</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Putting them together: Making the diskette(s)</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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>
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