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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 22 (last)        jacobw </title></head><body><center><h1>BBS 水木清华站∶精华区</h1></center><a name="top"></a>发信人:&nbsp;plato&nbsp;(纯真年代),&nbsp;信区:&nbsp;Embedded&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />标&nbsp;&nbsp;题:&nbsp;linux&nbsp;for&nbsp;ppc&nbsp;chapter&nbsp;22&nbsp;(last)&nbsp;<br />发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Wed&nbsp;May&nbsp;30&nbsp;23:26:13&nbsp;2001)&nbsp;<br />&nbsp;<br />Next&nbsp;Previous&nbsp;Contents&nbsp;<br />----------------------------------------------------------------------------&nbsp;<br />----&nbsp;<br />22.&nbsp;Glossary&nbsp;<br />22.1&nbsp;ABI&nbsp;-&nbsp;Application&nbsp;Binary&nbsp;Interface&nbsp;<br />The&nbsp;convention&nbsp;for&nbsp;register&nbsp;usage&nbsp;and&nbsp;C&nbsp;linkage&nbsp;commonly&nbsp;used&nbsp;on&nbsp;desktop&nbsp;Pow&nbsp;<br />erPC&nbsp;machines.&nbsp;Similar,&nbsp;but&nbsp;not&nbsp;identical&nbsp;to&nbsp;the&nbsp;EABI.&nbsp;<br />22.2&nbsp;BDM&nbsp;-&nbsp;Background&nbsp;Debug&nbsp;Mode&nbsp;<br />An&nbsp;on-chip&nbsp;debugging&nbsp;interface,&nbsp;largely&nbsp;eliminating&nbsp;the&nbsp;need&nbsp;for&nbsp;expensive&nbsp;I&nbsp;<br />n&nbsp;Circuit&nbsp;Emulators.&nbsp;<br />22.3&nbsp;CPM&nbsp;-&nbsp;Communications&nbsp;Processor&nbsp;Module&nbsp;<br />The&nbsp;magic&nbsp;communications&nbsp;co-processor&nbsp;in&nbsp;Motorola&nbsp;PowerQUICC&nbsp;devices.&nbsp;It&nbsp;con&nbsp;<br />tains&nbsp;SCCs&nbsp;and&nbsp;SMCs&nbsp;,&nbsp;and&nbsp;performs&nbsp;SDMA&nbsp;and&nbsp;IDMA.&nbsp;<br />22.4&nbsp;CPU&nbsp;-&nbsp;Central&nbsp;Processor&nbsp;Unit&nbsp;<br />Depending&nbsp;on&nbsp;the&nbsp;context,&nbsp;this&nbsp;may&nbsp;refer&nbsp;to&nbsp;the&nbsp;PowerPC&nbsp;core&nbsp;itself,&nbsp;or&nbsp;the&nbsp;&nbsp;<br />physical&nbsp;processor&nbsp;device&nbsp;(including&nbsp;CPM,&nbsp;SIU,&nbsp;packaging&nbsp;etc)&nbsp;as&nbsp;a&nbsp;single&nbsp;un&nbsp;<br />it.&nbsp;<br />22.5&nbsp;DMA&nbsp;-&nbsp;Direct&nbsp;Memory&nbsp;Access&nbsp;<br />A&nbsp;form&nbsp;a&nbsp;data&nbsp;transfer&nbsp;directly&nbsp;between&nbsp;memory&nbsp;and&nbsp;a&nbsp;peripheral&nbsp;or&nbsp;between&nbsp;m&nbsp;<br />emory&nbsp;and&nbsp;memory,&nbsp;without&nbsp;normal&nbsp;program&nbsp;intervention.&nbsp;<br />22.6&nbsp;EABI&nbsp;-&nbsp;Embedded&nbsp;Application&nbsp;Binary&nbsp;Interface&nbsp;<br />The&nbsp;convention&nbsp;for&nbsp;register&nbsp;usage&nbsp;and&nbsp;C&nbsp;linkage&nbsp;commonly&nbsp;used&nbsp;on&nbsp;embedded&nbsp;Po&nbsp;<br />werPC&nbsp;machines,&nbsp;derived&nbsp;from&nbsp;the&nbsp;ABI.&nbsp;<br />22.7&nbsp;FEC&nbsp;-&nbsp;Fast&nbsp;Ethernet&nbsp;Controller&nbsp;<br />The&nbsp;100&nbsp;Mbps&nbsp;(100Base)&nbsp;Ethernet&nbsp;controller,&nbsp;present&nbsp;on&nbsp;'T'&nbsp;devices&nbsp;such&nbsp;as&nbsp;t&nbsp;<br />he&nbsp;860T&nbsp;and&nbsp;855T.&nbsp;<br />22.8&nbsp;GPL/LGPL&nbsp;-&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License/Lesser&nbsp;General&nbsp;Public&nbsp;License&nbsp;<br /><a href="http://www.gnu.org/copyleft/gpl.html">http://www.gnu.org/copyleft/gpl.html</a>&nbsp;<br />The&nbsp;licenses&nbsp;under&nbsp;which&nbsp;the&nbsp;Linux&nbsp;kernel&nbsp;and&nbsp;much&nbsp;of&nbsp;the&nbsp;utility&nbsp;and&nbsp;librar&nbsp;<br />y&nbsp;code&nbsp;necessary&nbsp;to&nbsp;build&nbsp;a&nbsp;complete&nbsp;system&nbsp;may&nbsp;be&nbsp;copied,&nbsp;distributed&nbsp;and&nbsp;m&nbsp;<br />odified.&nbsp;Each&nbsp;portion&nbsp;of&nbsp;the&nbsp;software&nbsp;is&nbsp;copyright&nbsp;by&nbsp;its&nbsp;respected&nbsp;copyrigh&nbsp;<br />t&nbsp;holder,&nbsp;and&nbsp;you&nbsp;must&nbsp;comply&nbsp;with&nbsp;the&nbsp;terms&nbsp;of&nbsp;the&nbsp;license&nbsp;in&nbsp;order&nbsp;to&nbsp;lega&nbsp;<br />lly&nbsp;copy&nbsp;(and&nbsp;hence&nbsp;use)&nbsp;it.&nbsp;One&nbsp;significant&nbsp;requirement&nbsp;is&nbsp;that&nbsp;you&nbsp;freely&nbsp;&nbsp;<br />redistribute&nbsp;any&nbsp;modifications&nbsp;you&nbsp;make;&nbsp;if&nbsp;you&nbsp;can't&nbsp;cope&nbsp;with&nbsp;this,&nbsp;embedd&nbsp;<br />ed&nbsp;Linux&nbsp;isn't&nbsp;for&nbsp;you.&nbsp;<br />22.9&nbsp;IDMA&nbsp;-&nbsp;Independent&nbsp;DMA&nbsp;<br />A&nbsp;general&nbsp;purpose&nbsp;DMA&nbsp;engine&nbsp;with&nbsp;relatively&nbsp;limited&nbsp;throughput&nbsp;provided&nbsp;by&nbsp;&nbsp;<br />the&nbsp;microcoded&nbsp;CPM,&nbsp;for&nbsp;use&nbsp;with&nbsp;external&nbsp;peripherals&nbsp;or&nbsp;memory-to-memory&nbsp;tr&nbsp;<br />ansfers.&nbsp;<br />22.10&nbsp;MII&nbsp;-&nbsp;Media&nbsp;Independent&nbsp;Interface&nbsp;<br />The&nbsp;IEEE&nbsp;Ethernet&nbsp;standard&nbsp;control&nbsp;interface&nbsp;used&nbsp;to&nbsp;communicate&nbsp;between&nbsp;the&nbsp;<br />&nbsp;on-chip&nbsp;Ethernet&nbsp;controller&nbsp;and&nbsp;the&nbsp;external&nbsp;PHY.&nbsp;<br />22.11&nbsp;MMU&nbsp;-&nbsp;Memory&nbsp;Management&nbsp;Unit&nbsp;<br />CPU&nbsp;component&nbsp;which&nbsp;maps&nbsp;kernel-&nbsp;and&nbsp;user-space&nbsp;virtual&nbsp;addresses&nbsp;to&nbsp;physica&nbsp;<br />l&nbsp;addresses,&nbsp;and&nbsp;is&nbsp;an&nbsp;integral&nbsp;part&nbsp;of&nbsp;Linux&nbsp;kernel&nbsp;operation.&nbsp;<br />22.12&nbsp;PHY&nbsp;-&nbsp;Physical&nbsp;Interface&nbsp;<br />The&nbsp;IEEE&nbsp;Ethernet&nbsp;standard&nbsp;interface&nbsp;between&nbsp;the&nbsp;external&nbsp;physical&nbsp;layer&nbsp;tra&nbsp;<br />nsceiver&nbsp;and&nbsp;the&nbsp;on-chip&nbsp;ethernet&nbsp;controller&nbsp;in&nbsp;a&nbsp;PowerQUICC&nbsp;device.&nbsp;Often&nbsp;u&nbsp;<br />sed&nbsp;to&nbsp;refer&nbsp;to&nbsp;the&nbsp;external&nbsp;transceiver&nbsp;itself,&nbsp;the&nbsp;PHY&nbsp;is&nbsp;controlled&nbsp;more&nbsp;&nbsp;<br />or&nbsp;less&nbsp;transparently&nbsp;to&nbsp;software&nbsp;via&nbsp;the&nbsp;MII.&nbsp;<br />22.13&nbsp;SCC&nbsp;-&nbsp;Serial&nbsp;Communications&nbsp;Controller&nbsp;<br />The&nbsp;high&nbsp;performance&nbsp;module(s)&nbsp;within&nbsp;the&nbsp;CPM&nbsp;which&nbsp;implement&nbsp;the&nbsp;lowest&nbsp;lay&nbsp;<br />er&nbsp;of&nbsp;various&nbsp;serial&nbsp;protocols,&nbsp;such&nbsp;as&nbsp;Asynchronous&nbsp;serial&nbsp;(&nbsp;UART),&nbsp;10&nbsp;Mbps&nbsp;<br />&nbsp;Ethernet,&nbsp;HDLC&nbsp;etc.&nbsp;<br />22.14&nbsp;SDMA&nbsp;-&nbsp;Serial&nbsp;DMA&nbsp;<br />DMA&nbsp;used&nbsp;to&nbsp;transfer&nbsp;data&nbsp;to&nbsp;and&nbsp;from&nbsp;the&nbsp;SCCs.&nbsp;<br />22.15&nbsp;SIU&nbsp;-&nbsp;System&nbsp;Interface&nbsp;Unit&nbsp;<br />Provides&nbsp;much&nbsp;of&nbsp;the&nbsp;external&nbsp;interfacing&nbsp;logic.&nbsp;It's&nbsp;the&nbsp;other&nbsp;major&nbsp;module&nbsp;<br />&nbsp;on&nbsp;Motorola&nbsp;PowerQUICC&nbsp;devices&nbsp;alongside&nbsp;the&nbsp;CPU&nbsp;core&nbsp;and&nbsp;CPM.&nbsp;<br />22.16&nbsp;SPI&nbsp;-&nbsp;Serial&nbsp;Peripheral&nbsp;Interface&nbsp;<br />A&nbsp;relatively&nbsp;simple&nbsp;synchronous&nbsp;serial&nbsp;interface&nbsp;for&nbsp;connecting&nbsp;low&nbsp;speed&nbsp;ex&nbsp;<br />ternal&nbsp;devices&nbsp;using&nbsp;minimal&nbsp;wires.&nbsp;<br />22.17&nbsp;SMC&nbsp;-&nbsp;Serial&nbsp;Management&nbsp;Controller&nbsp;<br />A&nbsp;lower&nbsp;performance&nbsp;version&nbsp;of&nbsp;the&nbsp;SCCs&nbsp;with&nbsp;more&nbsp;limited&nbsp;functionality,&nbsp;par&nbsp;<br />ticularly&nbsp;useful&nbsp;for&nbsp;serial&nbsp;debug&nbsp;ports&nbsp;and&nbsp;low&nbsp;throughput&nbsp;serial&nbsp;protocols.&nbsp;<br />&nbsp;<br />22.18&nbsp;UART&nbsp;-&nbsp;Universal&nbsp;Asynchronous&nbsp;Receiver&nbsp;Transmitter&nbsp;<br />Generically,&nbsp;this&nbsp;refers&nbsp;to&nbsp;any&nbsp;device&nbsp;capable&nbsp;of&nbsp;implementing&nbsp;a&nbsp;variety&nbsp;of&nbsp;&nbsp;<br />asynchronous&nbsp;serial&nbsp;protocols,&nbsp;such&nbsp;as&nbsp;RS-232,&nbsp;HDLC&nbsp;and&nbsp;SDLC.&nbsp;In&nbsp;this&nbsp;contex&nbsp;<br />t,&nbsp;it&nbsp;refers&nbsp;to&nbsp;the&nbsp;operating&nbsp;mode&nbsp;of&nbsp;the&nbsp;SCCs&nbsp;which&nbsp;provides&nbsp;this&nbsp;functiona&nbsp;<br />lity.&nbsp;<br />22.19&nbsp;UPM&nbsp;-&nbsp;User&nbsp;Programmable&nbsp;Machine&nbsp;<br />A&nbsp;highly&nbsp;flexible&nbsp;bus&nbsp;interfacing&nbsp;machine&nbsp;unit&nbsp;allowing&nbsp;external&nbsp;peripherals&nbsp;<br />&nbsp;with&nbsp;an&nbsp;extremely&nbsp;wide&nbsp;variety&nbsp;of&nbsp;interfacing&nbsp;requirements&nbsp;to&nbsp;be&nbsp;connected&nbsp;&nbsp;<br />directly&nbsp;to&nbsp;the&nbsp;CPU.&nbsp;<br />----------------------------------------------------------------------------&nbsp;<br />----&nbsp;<br />Next&nbsp;Previous&nbsp;Contents&nbsp;&nbsp;<br />&nbsp;<br />--&nbsp;<br />&nbsp;<br />※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;smth.org·[FROM:&nbsp;166.111.161.8]&nbsp;<br /><a href="00000023.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></center><center><h1>BBS 水木清华站∶精华区</h1></center></body></html>
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