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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta name="generator" content="HTML Tidy, see www.w3.org" /><title>Kernel Interaction During Boot</title><meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /><link rel="HOME" title="FreeBSD Handbook" href="index.html" /><link rel="UP" title="The FreeBSD Booting Process" href="boot.html" /><link rel="PREVIOUS" title="The MBR, and Boot Stages One, Two, and Three"href="boot-blocks.html" /><link rel="NEXT" title="Device Hints" href="device-hints.html" /><link rel="STYLESHEET" type="text/css" href="docbook.css" /></head><body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"alink="#0000FF"><div class="NAVHEADER"><table summary="Header navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><th colspan="3" align="center">FreeBSD Handbook</th></tr><tr><td width="10%" align="left" valign="bottom"><a href="boot-blocks.html"accesskey="P">Prev</a></td><td width="80%" align="center" valign="bottom">Chapter 12 The FreeBSD BootingProcess</td><td width="10%" align="right" valign="bottom"><a href="device-hints.html"accesskey="N">Next</a></td></tr></table><hr align="LEFT" width="100%" /></div><div class="SECT1"><h1 class="SECT1"><a id="BOOT-KERNEL" name="BOOT-KERNEL">12.4 Kernel Interaction DuringBoot</a></h1><p>Once the kernel is loaded by either <a href="boot-blocks.html#BOOT-LOADER">loader</a>(as usual) or <a href="boot-blocks.html#BOOT-BOOT1">boot2</a> (bypassing the loader), itexamines its boot flags, if any, and adjusts its behavior as necessary.</p><div class="SECT2"><h2 class="SECT2"><a id="BOOT-KERNEL-BOOTFLAGS" name="BOOT-KERNEL-BOOTFLAGS">12.4.1Kernel Boot Flags</a></h2><p>Here are the more common boot flags:</p><div class="VARIABLELIST"><dl><dt><var class="OPTION">-a</var></dt><dd><p>during kernel initialization, ask for the device to mount as the root file system.</p></dd><dt><var class="OPTION">-C</var></dt><dd><p>boot from CDROM.</p></dd><dt><var class="OPTION">-c</var></dt><dd><p>run UserConfig, the boot-time kernel configurator</p></dd><dt><var class="OPTION">-s</var></dt><dd><p>boot into single-user mode</p></dd><dt><var class="OPTION">-v</var></dt><dd><p>be more verbose during kernel startup</p></dd></dl></div><div class="NOTE"><blockquote class="NOTE"><p><b>Note:</b> There are other boot flags, read <ahref="http://www.FreeBSD.org/cgi/man.cgi?query=boot&sektion=8"><spanclass="CITEREFENTRY"><span class="REFENTRYTITLE">boot</span>(8)</span></a> for moreinformation on them.</p></blockquote></div></div></div><div class="NAVFOOTER"><hr align="LEFT" width="100%" /><table summary="Footer navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><td width="33%" align="left" valign="top"><a href="boot-blocks.html"accesskey="P">Prev</a></td><td width="34%" align="center" valign="top"><a href="index.html"accesskey="H">Home</a></td><td width="33%" align="right" valign="top"><a href="device-hints.html"accesskey="N">Next</a></td></tr><tr><td width="33%" align="left" valign="top">The MBR, and Boot Stages One, Two, andThree</td><td width="34%" align="center" valign="top"><a href="boot.html" accesskey="U">Up</a></td><td width="33%" align="right" valign="top">Device Hints</td></tr></table></div><p align="center"><small>This, and other documents, can be downloaded from <ahref="ftp://ftp.FreeBSD.org/pub/FreeBSD/doc/">ftp://ftp.FreeBSD.org/pub/FreeBSD/doc/</a>.</small></p><p align="center"><small>For questions about FreeBSD, read the <ahref="http://www.FreeBSD.org/docs.html">documentation</a> before contacting <<ahref="mailto:questions@FreeBSD.org">questions@FreeBSD.org</a>>.<br />For questions about this documentation, e-mail <<ahref="mailto:doc@FreeBSD.org">doc@FreeBSD.org</a>>.</small></p></body></html>⌨️ 快捷键说明
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