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<?xml version="1.0" encoding="gb2312"?><!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 http-equiv="Content-Type" content="text/html; charset=gb2312"/><title>Embedded Linux Howto （3)              turbolinux </title></head><body><center><h1>BBS 水木清华站∶精华区</h1></center><a name="top"></a>发信人:&nbsp;turbolinux&nbsp;(hoho~神啊，救救我吧...),&nbsp;信区:&nbsp;Embedded&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />标&nbsp;&nbsp;题:&nbsp;Embedded&nbsp;Linux&nbsp;Howto&nbsp;（3)&nbsp;<br />发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Thu&nbsp;Jul&nbsp;12&nbsp;00:30:39&nbsp;2001)&nbsp;<br />&nbsp;<br />3.&nbsp;The&nbsp;boot&nbsp;process.&nbsp;<br />This&nbsp;section&nbsp;is&nbsp;for&nbsp;the&nbsp;most&nbsp;based&nbsp;on&nbsp;the&nbsp;Bootdisk-HOWTO.&nbsp;&nbsp;<br />&nbsp;<br />3.1&nbsp;Bios&nbsp;&nbsp;<br />All&nbsp;PC&nbsp;systems&nbsp;start&nbsp;the&nbsp;boot&nbsp;process&nbsp;by&nbsp;executing&nbsp;code&nbsp;in&nbsp;ROM&nbsp;&nbsp;<br />(specifically,&nbsp;the&nbsp;BIOS)&nbsp;to&nbsp;load&nbsp;the&nbsp;sector&nbsp;from&nbsp;sector&nbsp;0,&nbsp;cylinder&nbsp;0&nbsp;of&nbsp;<br />&nbsp;the&nbsp;boot&nbsp;drive.&nbsp;The&nbsp;boot&nbsp;drive&nbsp;is&nbsp;usually&nbsp;the&nbsp;first&nbsp;floppy&nbsp;drive&nbsp;&nbsp;<br />(designated&nbsp;A:&nbsp;in&nbsp;DOS&nbsp;and&nbsp;/dev/fd0&nbsp;in&nbsp;Linux).&nbsp;The&nbsp;BIOS&nbsp;then&nbsp;tries&nbsp;to&nbsp;&nbsp;<br />execute&nbsp;this&nbsp;sector.&nbsp;On&nbsp;most&nbsp;bootable&nbsp;disks,&nbsp;sector&nbsp;0,&nbsp;cylinder&nbsp;0&nbsp;&nbsp;<br />contains&nbsp;either:&nbsp;&nbsp;<br />&nbsp;<br />Code&nbsp;from&nbsp;a&nbsp;boot&nbsp;loader&nbsp;such&nbsp;as&nbsp;LILO,&nbsp;which&nbsp;locates&nbsp;the&nbsp;kernel,&nbsp;loads&nbsp;it&nbsp;<br />&nbsp;and&nbsp;executes&nbsp;it&nbsp;to&nbsp;start&nbsp;the&nbsp;boot&nbsp;proper.&nbsp;&nbsp;<br />he&nbsp;start&nbsp;of&nbsp;an&nbsp;operating&nbsp;system&nbsp;kernel,&nbsp;such&nbsp;as&nbsp;Linux.&nbsp;&nbsp;<br />If&nbsp;a&nbsp;Linux&nbsp;kernel&nbsp;has&nbsp;been&nbsp;raw-copied&nbsp;to&nbsp;a&nbsp;diskette,&nbsp;a&nbsp;hard&nbsp;drive&nbsp;or&nbsp;&nbsp;<br />another&nbsp;media,&nbsp;the&nbsp;first&nbsp;sector&nbsp;of&nbsp;the&nbsp;disk&nbsp;will&nbsp;be&nbsp;the&nbsp;first&nbsp;sector&nbsp;&nbsp;<br />of&nbsp;the&nbsp;Linux&nbsp;kernel&nbsp;itself.&nbsp;This&nbsp;first&nbsp;sector&nbsp;will&nbsp;continue&nbsp;the&nbsp;boot&nbsp;&nbsp;<br />process&nbsp;by&nbsp;loading&nbsp;the&nbsp;rest&nbsp;of&nbsp;the&nbsp;kernel&nbsp;from&nbsp;the&nbsp;boot&nbsp;device.&nbsp;&nbsp;<br />3.2&nbsp;The&nbsp;boot&nbsp;loader&nbsp;&nbsp;<br />We&nbsp;will&nbsp;use&nbsp;a&nbsp;boot&nbsp;loader&nbsp;like&nbsp;lilo&nbsp;to&nbsp;operate&nbsp;our&nbsp;boot&nbsp;process.&nbsp;It&nbsp;&nbsp;<br />permits&nbsp;to&nbsp;have&nbsp;the&nbsp;dev&nbsp;and&nbsp;production&nbsp;platforms&nbsp;on&nbsp;the&nbsp;same&nbsp;hardware&nbsp;&nbsp;<br />and&nbsp;to&nbsp;switch&nbsp;from&nbsp;one&nbsp;to&nbsp;the&nbsp;other&nbsp;by&nbsp;only&nbsp;rebooting.&nbsp;The&nbsp;lilo&nbsp;boot&nbsp;&nbsp;<br />loader&nbsp;is&nbsp;loaded&nbsp;by&nbsp;the&nbsp;bios.&nbsp;Then,&nbsp;it&nbsp;loads&nbsp;kernels&nbsp;or&nbsp;the&nbsp;boot&nbsp;sectors&nbsp;<br />&nbsp;of&nbsp;other&nbsp;operating&nbsp;systems.&nbsp;It&nbsp;also&nbsp;provides&nbsp;a&nbsp;simple&nbsp;command-line&nbsp;&nbsp;<br />interface&nbsp;to&nbsp;interactively&nbsp;select&nbsp;the&nbsp;item&nbsp;to&nbsp;boot&nbsp;with&nbsp;its&nbsp;options.&nbsp;&nbsp;<br />More&nbsp;may&nbsp;be&nbsp;found&nbsp;in&nbsp;the&nbsp;Lilo&nbsp;documentation&nbsp;at&nbsp;<a href="ftp://sunsite.unc.">ftp://sunsite.unc.</a>&nbsp;<br />edu/pub/Linux/system/boot/lilo/.&nbsp;&nbsp;<br />&nbsp;<br />3.3&nbsp;The&nbsp;Kernel&nbsp;&nbsp;<br />The&nbsp;kernel&nbsp;checks&nbsp;the&nbsp;hardware&nbsp;and&nbsp;mounts&nbsp;the&nbsp;root&nbsp;device.&nbsp;Then&nbsp;it&nbsp;looks&nbsp;<br />&nbsp;for&nbsp;the&nbsp;init&nbsp;program&nbsp;on&nbsp;the&nbsp;root&nbsp;filesystem&nbsp;and&nbsp;executes&nbsp;it.&nbsp;&nbsp;<br />&nbsp;<br />3.4&nbsp;Init&nbsp;&nbsp;<br />Init&nbsp;is&nbsp;the&nbsp;parent&nbsp;of&nbsp;all&nbsp;other&nbsp;processes&nbsp;that&nbsp;will&nbsp;run&nbsp;on&nbsp;your&nbsp;linux&nbsp;&nbsp;<br />OS,&nbsp;it&nbsp;will&nbsp;watch&nbsp;it's&nbsp;child&nbsp;processes&nbsp;and&nbsp;start,&nbsp;stop,&nbsp;re-lauch&nbsp;them&nbsp;if&nbsp;<br />&nbsp;needed.&nbsp;init&nbsp;takes&nbsp;all&nbsp;information&nbsp;from&nbsp;/etc/inittab.&nbsp;&nbsp;<br />&nbsp;<br />3.5&nbsp;inittab&nbsp;&nbsp;<br />The&nbsp;file&nbsp;/etc/inittab/&nbsp;refers&nbsp;to&nbsp;scripts&nbsp;named&nbsp;/etc/rc...&nbsp;to&nbsp;do&nbsp;the&nbsp;&nbsp;<br />system&nbsp;setup.&nbsp;It&nbsp;also&nbsp;has&nbsp;entries&nbsp;for&nbsp;the&nbsp;getty&nbsp;tool&nbsp;to&nbsp;handle&nbsp;the&nbsp;login&nbsp;<br />&nbsp;process.&nbsp;&nbsp;<br />&nbsp;<br />3.6&nbsp;The&nbsp;login&nbsp;process&nbsp;&nbsp;<br />There&nbsp;is&nbsp;one&nbsp;getty&nbsp;available&nbsp;in&nbsp;the&nbsp;inittab&nbsp;file&nbsp;for&nbsp;each&nbsp;console&nbsp;you&nbsp;&nbsp;<br />allow&nbsp;for&nbsp;the&nbsp;users.&nbsp;Getty&nbsp;will&nbsp;launch&nbsp;/bin/login&nbsp;to&nbsp;verify&nbsp;the&nbsp;user&nbsp;&nbsp;<br />password.&nbsp;&nbsp;<br />&nbsp;<br />More&nbsp;info&nbsp;about&nbsp;the&nbsp;boot&nbsp;process&nbsp;may&nbsp;be&nbsp;found&nbsp;at&nbsp;Linux&nbsp;Documentation&nbsp;&nbsp;<br />Project&nbsp;and&nbsp;in&nbsp;the&nbsp;init&nbsp;and&nbsp;inittab&nbsp;man&nbsp;pages.&nbsp;&nbsp;<br />&nbsp;<br />&nbsp;<br />--&nbsp;<br />Welcome&nbsp;to&nbsp;<a href="http://www.EnjoySmart.com">http://www.EnjoySmart.com</a>&nbsp;<br />&nbsp;&nbsp;--&gt;Dedicated&nbsp;to&nbsp;Smart&nbsp;Home&nbsp;&amp;&nbsp;Network&nbsp;Appliances&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;<br />&nbsp;<br />※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;smth.org·[FROM:&nbsp;166.111.174.125]&nbsp;<br /><a href="00000012.htm">上一篇</a><a href="javascript:history.go(-1)">返回上一页</a><a href="index.htm">回到目录</a><a href="#top">回到页首</a><a href="00000014.htm">下一篇</a></h1></center><center><h1>BBS 水木清华站∶精华区</h1></center></body></html>

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