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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>linux for ppc chapter 10               jacobw </title></head><body><center><h1>BBS 水木清華站∶精華區</h1></center><a name="top"></a>發信人:&nbsp;plato&nbsp;(純真年代),&nbsp;信區:&nbsp;Embedded&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />標&nbsp;&nbsp;題:&nbsp;linux&nbsp;for&nbsp;ppc&nbsp;chapter&nbsp;10&nbsp;<br />發信站:&nbsp;BBS&nbsp;水木清華站&nbsp;(Wed&nbsp;May&nbsp;30&nbsp;23:16:14&nbsp;2001)&nbsp;<br />&nbsp;<br />Next&nbsp;Previous&nbsp;Contents&nbsp;<br />----------------------------------------------------------------------------&nbsp;<br />----&nbsp;<br />10.&nbsp;Kernel&nbsp;<br />10.1&nbsp;Series&nbsp;<br />You&nbsp;will&nbsp;need&nbsp;to&nbsp;decide&nbsp;whether&nbsp;to&nbsp;use&nbsp;a&nbsp;tried-and-tested&nbsp;stable&nbsp;series&nbsp;kern&nbsp;<br />el,&nbsp;or&nbsp;a&nbsp;development&nbsp;kernel.&nbsp;The&nbsp;choice&nbsp;will&nbsp;depend&nbsp;on&nbsp;your&nbsp;project&nbsp;requirme&nbsp;<br />nts,&nbsp;and&nbsp;how&nbsp;much&nbsp;work&nbsp;you&nbsp;want&nbsp;to&nbsp;do&nbsp;to&nbsp;port&nbsp;and&nbsp;maintain&nbsp;the&nbsp;kernel&nbsp;on&nbsp;you&nbsp;<br />r&nbsp;hardware.&nbsp;For&nbsp;any&nbsp;non-trivial&nbsp;project,&nbsp;you&nbsp;can&nbsp;expect&nbsp;several&nbsp;major&nbsp;kernel&nbsp;<br />&nbsp;releases&nbsp;during&nbsp;the&nbsp;project's&nbsp;life.&nbsp;Consider&nbsp;the&nbsp;availability&nbsp;of&nbsp;the&nbsp;featur&nbsp;<br />es&nbsp;you&nbsp;need,&nbsp;how&nbsp;leading&nbsp;edge&nbsp;you&nbsp;want&nbsp;to&nbsp;be,&nbsp;and&nbsp;the&nbsp;likely&nbsp;status&nbsp;of&nbsp;each&nbsp;&nbsp;<br />kernel&nbsp;series&nbsp;by&nbsp;the&nbsp;time&nbsp;you're&nbsp;ready&nbsp;to&nbsp;ship.&nbsp;<br />You&nbsp;are&nbsp;probably&nbsp;best&nbsp;off&nbsp;using&nbsp;the&nbsp;stable&nbsp;version,&nbsp;unless&nbsp;you&nbsp;want&nbsp;to&nbsp;activ&nbsp;<br />ely&nbsp;participate&nbsp;in&nbsp;future&nbsp;development&nbsp;of&nbsp;Linux&nbsp;itself,&nbsp;or&nbsp;require&nbsp;features&nbsp;a&nbsp;<br />nd/or&nbsp;board&nbsp;support&nbsp;only&nbsp;present&nbsp;in&nbsp;the&nbsp;development&nbsp;series.&nbsp;<br />Stable&nbsp;<br />Montavista&nbsp;<br />The&nbsp;latest&nbsp;stable&nbsp;kernel&nbsp;from&nbsp;the&nbsp;MontaVista&nbsp;Hard&nbsp;Hat&nbsp;Linux&nbsp;kit&nbsp;is&nbsp;probably&nbsp;&nbsp;<br />your&nbsp;best&nbsp;bet.&nbsp;<br />Also,&nbsp;check&nbsp;for&nbsp;later&nbsp;updates&nbsp;in:&nbsp;<a href="ftp://ftp.mvista.com/pub/CDK/updates/,">ftp://ftp.mvista.com/pub/CDK/updates/,</a>&nbsp;<br />or&nbsp;for&nbsp;the&nbsp;very&nbsp;latest&nbsp;work-in-progress,&nbsp;see:&nbsp;<a href="ftp://ftp.mvista.com/pub/CDK/w">ftp://ftp.mvista.com/pub/CDK/w</a>&nbsp;<br />ip/ppc_8xx/RPMS&nbsp;<br />Denx&nbsp;Software&nbsp;Engineering&nbsp;<br /><a href="ftp://ftp.denx.de/pub/LinuxPPC/usr/src/">ftp://ftp.denx.de/pub/LinuxPPC/usr/src/</a>&nbsp;<br />Development&nbsp;<br />FSMLabs&nbsp;<br /><a href="http://www.fsmlabs.com/linuxppcbk.html.">http://www.fsmlabs.com/linuxppcbk.html.</a>&nbsp;<br />The&nbsp;latest&nbsp;up-to-the-minute&nbsp;development&nbsp;kernel&nbsp;for&nbsp;PowerPC&nbsp;devices&nbsp;can&nbsp;be&nbsp;ac&nbsp;<br />cessed&nbsp;via&nbsp;a&nbsp;number&nbsp;of&nbsp;methods.&nbsp;<br />Official&nbsp;Sources&nbsp;<br /><a href="http://www.kernel.org/">http://www.kernel.org/</a>&nbsp;<br />Work&nbsp;is&nbsp;ongoing&nbsp;to&nbsp;merge&nbsp;the&nbsp;embedded&nbsp;PowerPC&nbsp;changes&nbsp;into&nbsp;the&nbsp;current&nbsp;devel&nbsp;<br />opment&nbsp;tree,&nbsp;but&nbsp;the&nbsp;latest&nbsp;PPC&nbsp;changes&nbsp;take&nbsp;some&nbsp;time&nbsp;to&nbsp;propagate&nbsp;here.&nbsp;<br />10.2&nbsp;Memory&nbsp;Map&nbsp;<br />The&nbsp;boot&nbsp;loader&nbsp;is&nbsp;responsible&nbsp;for&nbsp;configuring&nbsp;the&nbsp;memory&nbsp;map&nbsp;before&nbsp;jumping&nbsp;<br />&nbsp;to&nbsp;the&nbsp;Linux&nbsp;kernel.&nbsp;Embedded&nbsp;PowerPC&nbsp;processors&nbsp;provide&nbsp;extreme&nbsp;flexibilit&nbsp;<br />y&nbsp;for&nbsp;address&nbsp;mapping&nbsp;of&nbsp;internal&nbsp;and&nbsp;external&nbsp;devices.&nbsp;You&nbsp;should&nbsp;use&nbsp;this&nbsp;&nbsp;<br />flexibitily&nbsp;to&nbsp;configure&nbsp;the&nbsp;memory&nbsp;map&nbsp;of&nbsp;your&nbsp;board&nbsp;to&nbsp;match&nbsp;the&nbsp;needs&nbsp;of&nbsp;&nbsp;<br />the&nbsp;Linux&nbsp;kernel,&nbsp;rather&nbsp;than&nbsp;modify&nbsp;the&nbsp;Linux&nbsp;kernel&nbsp;MMU&nbsp;handling&nbsp;to&nbsp;match&nbsp;&nbsp;<br />some&nbsp;arbitrary&nbsp;addressing&nbsp;scheme.&nbsp;<br />See:&nbsp;<a href="http://lists.linuxppc.org/listarcs/linuxppc-embedded/200005/msg00157.ht">http://lists.linuxppc.org/listarcs/linuxppc-embedded/200005/msg00157.ht</a>&nbsp;<br />ml&nbsp;also&nbsp;check&nbsp;out&nbsp;Documentation/IO-mapping.txt&nbsp;in&nbsp;the&nbsp;kernel&nbsp;source&nbsp;tree.&nbsp;<br />10.3&nbsp;Porting&nbsp;<br />Provided&nbsp;that&nbsp;the&nbsp;CPU&nbsp;you&nbsp;are&nbsp;using&nbsp;is&nbsp;already&nbsp;supported&nbsp;in&nbsp;the&nbsp;kernel,&nbsp;most&nbsp;<br />&nbsp;of&nbsp;the&nbsp;work&nbsp;involved&nbsp;in&nbsp;porting&nbsp;Linux&nbsp;to&nbsp;a&nbsp;new&nbsp;platform&nbsp;actually&nbsp;involves&nbsp;c&nbsp;<br />hanges&nbsp;to&nbsp;the&nbsp;ROM&nbsp;startup&nbsp;code,&nbsp;rather&nbsp;than&nbsp;the&nbsp;kernel&nbsp;itself.&nbsp;The&nbsp;other&nbsp;maj&nbsp;<br />or&nbsp;kernel&nbsp;effort&nbsp;required&nbsp;is&nbsp;in&nbsp;device&nbsp;drivers&nbsp;for&nbsp;new&nbsp;hardware&nbsp;devices.&nbsp;<br />10.4&nbsp;Patches&nbsp;<br />Once&nbsp;you've&nbsp;got&nbsp;something&nbsp;working,&nbsp;there's&nbsp;an&nbsp;abundance&nbsp;of&nbsp;kernel&nbsp;patches&nbsp;av&nbsp;<br />ailable&nbsp;on&nbsp;the&nbsp;'net&nbsp;which&nbsp;can&nbsp;help&nbsp;customise&nbsp;the&nbsp;kernel&nbsp;to&nbsp;your&nbsp;application.&nbsp;<br />&nbsp;Patches&nbsp;are&nbsp;generally&nbsp;issued&nbsp;against&nbsp;a&nbsp;particular&nbsp;kernel&nbsp;version,&nbsp;but&nbsp;can&nbsp;o&nbsp;<br />ften&nbsp;be&nbsp;applied&nbsp;against&nbsp;other&nbsp;versions&nbsp;either&nbsp;automatically&nbsp;or&nbsp;with&nbsp;manual&nbsp;a&nbsp;<br />ssistance.&nbsp;<br />For&nbsp;a&nbsp;number&nbsp;of&nbsp;embedded-system&nbsp;related&nbsp;patches&nbsp;including&nbsp;kernel&nbsp;size&nbsp;optimi&nbsp;<br />sations,&nbsp;see:&nbsp;<a href="http://members.xoom.com/greyhams/linux/patches/">http://members.xoom.com/greyhams/linux/patches/</a>&nbsp;<br />Peter&nbsp;Allworth&nbsp;has&nbsp;some&nbsp;kernel&nbsp;patches&nbsp;at:&nbsp;<a href="http://www.zeta.org.au/~linsol/">http://www.zeta.org.au/~linsol/</a>&nbsp;<br />10.5&nbsp;Contributing&nbsp;<br />The&nbsp;people&nbsp;who&nbsp;actively&nbsp;contribute&nbsp;to&nbsp;open&nbsp;source&nbsp;development&nbsp;are&nbsp;also&nbsp;the&nbsp;o&nbsp;<br />nes&nbsp;that&nbsp;benefit&nbsp;the&nbsp;most&nbsp;from&nbsp;it,&nbsp;so&nbsp;it&nbsp;makes&nbsp;sense&nbsp;to&nbsp;actively&nbsp;contribute&nbsp;&nbsp;<br />wherever&nbsp;you&nbsp;can.&nbsp;<br />Virtually&nbsp;all&nbsp;the&nbsp;existing&nbsp;embedded&nbsp;Linux&nbsp;code&nbsp;is&nbsp;covered&nbsp;by&nbsp;the&nbsp;GPL,&nbsp;which&nbsp;&nbsp;<br />requires&nbsp;you&nbsp;to&nbsp;redistribute&nbsp;any&nbsp;changes&nbsp;you&nbsp;make.&nbsp;Contributing&nbsp;your&nbsp;work&nbsp;of&nbsp;<br />fers&nbsp;an&nbsp;invaluable&nbsp;opportunity&nbsp;for&nbsp;peer&nbsp;review&nbsp;far&nbsp;beyond&nbsp;what&nbsp;is&nbsp;normally&nbsp;p&nbsp;<br />ossible&nbsp;within&nbsp;a&nbsp;single&nbsp;organisation,&nbsp;and&nbsp;can&nbsp;save&nbsp;countless&nbsp;hours&nbsp;of&nbsp;unnece&nbsp;<br />ssary&nbsp;debugging.&nbsp;<br />10.6&nbsp;Submitting&nbsp;Patches&nbsp;<br />In&nbsp;general,&nbsp;patches&nbsp;should&nbsp;be&nbsp;submitted&nbsp;in&nbsp;unidiff&nbsp;format&nbsp;to&nbsp;the&nbsp;mailing&nbsp;lis&nbsp;<br />t.&nbsp;Even&nbsp;if&nbsp;you&nbsp;submit&nbsp;them&nbsp;directly&nbsp;to&nbsp;the&nbsp;maintainer,&nbsp;remember&nbsp;to&nbsp;cc:&nbsp;a&nbsp;cop&nbsp;<br />y&nbsp;to&nbsp;the&nbsp;mailing&nbsp;list,&nbsp;to&nbsp;keep&nbsp;everyone&nbsp;else&nbsp;informed&nbsp;of&nbsp;what's&nbsp;going&nbsp;on.&nbsp;If&nbsp;<br />&nbsp;it's&nbsp;large,&nbsp;put&nbsp;it&nbsp;up&nbsp;for&nbsp;ftp&nbsp;and&nbsp;post&nbsp;a&nbsp;pointer&nbsp;instead.&nbsp;<br />10.7&nbsp;Coding&nbsp;Style&nbsp;<br />When&nbsp;working&nbsp;on&nbsp;an&nbsp;existing&nbsp;code&nbsp;base,&nbsp;you&nbsp;should&nbsp;always&nbsp;use&nbsp;whatever&nbsp;coding&nbsp;<br />&nbsp;style&nbsp;is&nbsp;used&nbsp;in&nbsp;the&nbsp;existing&nbsp;code.&nbsp;Consistency&nbsp;here&nbsp;is&nbsp;better&nbsp;than&nbsp;your&nbsp;su&nbsp;<br />bjective&nbsp;notion&nbsp;of&nbsp;correctness.&nbsp;<br />When&nbsp;working&nbsp;on&nbsp;the&nbsp;kernel,&nbsp;follow&nbsp;the&nbsp;guidelines&nbsp;in&nbsp;Documentation/CodingSty&nbsp;<br />le.&nbsp;<br />When&nbsp;working&nbsp;on&nbsp;other&nbsp;GNU&nbsp;software,&nbsp;follow&nbsp;the&nbsp;guidelines&nbsp;at&nbsp;<a href="http://www.gnu.">http://www.gnu.</a>&nbsp;<br />org/prep/standards_toc.html.&nbsp;<br />And&nbsp;remember,&nbsp;you&nbsp;don't&nbsp;have&nbsp;to&nbsp;like&nbsp;the&nbsp;guidelines,&nbsp;you&nbsp;just&nbsp;have&nbsp;to&nbsp;follow&nbsp;<br />&nbsp;them.&nbsp;<br />----------------------------------------------------------------------------&nbsp;<br />----&nbsp;<br />Next&nbsp;Previous&nbsp;Contents&nbsp;&nbsp;<br />&nbsp;<br />--&nbsp;<br />&nbsp;<br />※&nbsp;來源:·BBS&nbsp;水木清華站&nbsp;smth.org·[FROM:&nbsp;166.111.161.8]&nbsp;<br /><a href="00000009.htm">上一篇</a><a href="javascript:history.go(-1)">返回上一頁</a><a href="index.htm">回到目錄</a><a href="#top">回到頁首</a><a href="00000011.htm">下一篇</a></h1></center><center><h1>BBS 水木清華站∶精華區</h1></center></body></html>
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