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📁 有关ecos2。0介绍了实时嵌入式的结构以及线程调度的实现和内存的管理等
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<!-- Copyright (C) 2003 Red Hat, Inc.                                --><!-- This material may be distributed only subject to the terms      --><!-- and conditions set forth in the Open Publication License, v1.0  --><!-- or later (the latest version is presently available at          --><!-- http://www.opencontent.org/openpub/).                           --><!-- Distribution of the work or derivative of the work in any       --><!-- standard (paper) book form is prohibited unless prior           --><!-- permission is obtained from the copyright holder.               --><HTML><HEAD><TITLE>hardware</TITLE><meta name="MSSmartTagsPreventParsing" content="TRUE"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="The eCos Component Writer's Guide"HREF="cdl-guide.html"><LINKREL="UP"TITLE="CDL Language Specification"HREF="reference.html"><LINKREL="PREVIOUS"TITLE="flavor"HREF="ref.flavor.html"><LINKREL="NEXT"TITLE="if_define"HREF="ref.if-define.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">The <SPANCLASS="APPLICATION">eCos</SPAN> Component Writer's Guide</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="ref.flavor.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="ref.if-define.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="REF.HARDWARE"><SPANCLASS="PROPERTY">hardware</SPAN></H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN4413"></A><H2>Name</H2>Property <SPANCLASS="PROPERTY">hardware</SPAN>&nbsp;--&nbsp;Specify that a package is tied to specific hardware.</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN4417"><H2>Synopsis</H2><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SYNOPSIS">cdl_option &lt;name&gt; {    active_if &lt;condition&gt;    &#8230;}</PRE></TD></TR></TABLE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN4419"></A><H2>Description</H2><P>Some packages such as device drivers and HAL packages arehardware-specific, and generally it makes no sense to add suchpackages to a configuration unless the corresponding hardware ispresent on your target system. Typically hardware package selectionhappens automatically when you select your target. The <SPANCLASS="PROPERTY">hardware</SPAN>property can be used in the body of a <TTCLASS="LITERAL">cdl_package</TT> command toindicate that the package is hardware-specific.</P><DIVCLASS="NOTE"><BLOCKQUOTECLASS="NOTE"><P><B>Note: </B>At the time of writing the <SPANCLASS="PROPERTY">hardware</SPAN> property is largely ignored bythe configuration tools, but this may change in future. Amongst otherpossible changes, for hardware-specific packages such as devicedrivers and HAL packages, the current scheme of generating aconfiguration header file name based purely on the package name may beabandoned. Instead all hardware packages would send theirconfiguration data to a single header file, <TTCLASS="FILENAME">pkgconf/hardware.h</TT>. This would make iteasier for code to obtain details of the current hardware, butobviously there are compatibility issues. For now it is recommendedthat all hardware packages specify their configuration header fileexplicitly.</P></BLOCKQUOTE></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN4428"></A><H2>Example</H2><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="PROGRAMLISTING">cdl_package CYGPKG_HAL_ARM {    display       "ARM architecture"    parent        CYGPKG_HAL    hardware    include_dir   cyg/hal    define_header hal_arm.h    &#8230;}</PRE></TD></TR></TABLE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN4431"></A><H2>See Also</H2><P>Property <AHREF="ref.define-header.html"><SPANCLASS="PROPERTY">define_header</SPAN></A>, andcommand <AHREF="ref.cdl-package.html"><TTCLASS="LITERAL">cdl_package</TT></A>.</P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="ref.flavor.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="cdl-guide.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="ref.if-define.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><SPANCLASS="PROPERTY">flavor</SPAN></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><SPANCLASS="PROPERTY">if_define</SPAN></TD></TR></TABLE></DIV></BODY></HTML>
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