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study/boot/Bootdisk-HOWTO/Bootdisk-HOWTO-v450/x1440.html
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study/boot/Bootdisk-HOWTO/Bootdisk-HOWTO-v450/x1440.html
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<HTML
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><HEAD
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><TITLE
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>The Linux boot process</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="UP"
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TITLE="Resources and pointers"
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HREF="a1376.html"><LINK
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REL="PREVIOUS"
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TITLE="Ramdisk usage"
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HREF="x1434.html"><LINK
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REL="NEXT"
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TITLE="LILO boot error codes"
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HREF="a1483.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="x1434.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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>A. Resources and pointers</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="a1483.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="AEN1440"
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>A.5. The Linux boot process</A
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></H1
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><P
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>For more detail on the Linux boot process, here are some pointers:
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<P
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></P
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><UL
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><LI
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><P
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>The <A
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HREF="http://linuxdoc.org/LDP/sag/index.html"
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TARGET="_top"
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><I
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CLASS="CITETITLE"
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>Linux
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System Administrators' Guide</I
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></A
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> has a section on booting.</P
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></LI
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><LI
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><P
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>The <A
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HREF="http://www.ibiblio.org/pub/Linux/system/boot/lilo/lilo-t-21.ps.gz"
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TARGET="_top"
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>LILO ``Technical overview''</A
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> has the definitive technical, low-level
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description of the boot process, up to where the kernel is started.</P
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></LI
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><LI
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><P
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> The source code is the ultimate guide. Below are some kernel
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files related to the boot process. If you have the Linux kernel source code,
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you can find these under <TT
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CLASS="FILENAME"
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>/usr/src/linux</TT
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> on your machine;
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alternatively, Shigio Yamaguchi (shigio at tamacom.com) has a very nice <A
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HREF="http://www.tamacom.com/tour/linux/index.html"
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TARGET="_top"
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>hypertext kernel
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browser</A
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> for reading kernel source files. Here are some relevant files
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to look at:
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<P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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><TT
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CLASS="FILENAME"
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>arch/i386/boot/bootsect.S</TT
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> and
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<TT
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CLASS="FILENAME"
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>setup.S</TT
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></DT
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><DD
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><P
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>Contain assembly code for the bootsector itself.</P
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></DD
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><DT
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><TT
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CLASS="FILENAME"
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>arch/i386/boot/compressed/misc.c</TT
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></DT
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><DD
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><P
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>Contains code for uncompressing the kernel.</P
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></DD
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><DT
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><TT
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CLASS="FILENAME"
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>arch/i386/kernel/</TT
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></DT
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><DD
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><P
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>Directory containing kernel initialization code.
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<TT
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CLASS="FILENAME"
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>setup.c</TT
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> defines the ramdisk word.</P
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></DD
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><DT
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><TT
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CLASS="FILENAME"
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>drivers/block/rd.c</TT
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></DT
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><DD
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><P
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>Contains the ramdisk driver. The procedures
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<B
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CLASS="COMMAND"
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>rd_load</B
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> and <B
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CLASS="COMMAND"
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>rd_load_image</B
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> load blocks from a device into a
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ramdisk. The procedure
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<B
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CLASS="COMMAND"
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>identify_ramdisk_image</B
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> determines what
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kind of filesystem is found and whether it is compressed.</P
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></DD
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></DL
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></DIV
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> </P
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></LI
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></UL
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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="x1434.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="a1483.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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>Ramdisk usage</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="a1376.html"
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>Up</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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>LILO boot error codes</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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