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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><link rel="STYLESHEET" type="text/css" href="wrs.css"><title> Upgrading 4.3 BSD Network Drivers </title></head><body bgcolor="FFFFFF"><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-4.3upgrade2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p><font face="Helvetica, sans-serif" class="sans"><h3 class="H2"><i><a name="84769">14.1 Introduction</a></i></h3></font><dl class="margin"><dl class="margin"><dd><p class="Body"><a name="84771"> </a>This chapter describes two upgrade paths for 4.3 BSD network drivers. One path simply ports the 4.3 BSD network driver to the BSD 4.4 model. The other path upgrades the 4.3 BSD network driver to an NPT driver (described in the <i class="title">Network Protocol Toolkit User's Guide</i>). </p><dd><p class="Body"><a name="84230"> </a>Porting a network driver to the 4.4 BSD model should require only minimal changes to the code. In fact, porting some drivers has taken less than a day's work. However, an older driver that does not already use a transmission startup routine can take longer to port. </p><dd><p class="Body"><a name="84231"> </a>Porting a network driver to an NPT driver requires more extensive changes. However, it is worth the effort if the driver must handle the following: </p></dl><dl class="margin"><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84233"> </a>multicasting </li></ul></p><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84235"> </a>polled-mode Ethernet (necessary for WDB system-mode debugging over a network, a mode that is several orders of magnitude faster than the serial link) </li></ul></p><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84237"> </a>zero-copy transmission </li></ul></p><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84238"> </a>support for network protocols other than IP</li></ul></p></dl></dl><a name="foot"><hr></a><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-4.3upgrade.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-4.3upgrade2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p></body></html><!---by WRS Documentation (), Wind River Systems, Inc. conversion tool: Quadralay WebWorks Publisher 4.0.11 template: CSS Template, Jan 1998 - Jefro --->⌨️ 快捷键说明
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