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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 >Introduction</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="The eCos Hardware Abstraction Layer (HAL)" HREF="the-ecos-hardware-abstraction-layer.html"><LINK REL="PREVIOUS" TITLE="The eCos Hardware Abstraction Layer (HAL)" HREF="the-ecos-hardware-abstraction-layer.html"><LINK REL="NEXT" TITLE="Architecture, Variant and Platform" HREF="hal-architecture-variant-and-platform.html"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="the-ecos-hardware-abstraction-layer.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="hal-architecture-variant-and-platform.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="HAL-INTRODUCTION">Chapter 6. Introduction</H1 ><P >This is an initial specification of the <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >eCos</I ></SPAN > Hardware Abstraction Layer (HAL). The HAL abstracts the underlying hardware of a processor architecture and/or the platform to a level sufficient for the eCos kernel to be ported onto that platform.</P ><DIV CLASS="NOTE" ><BLOCKQUOTE CLASS="NOTE" ><P ><B >Caveat: </B >This document is an informal description of the HAL capabilities and is not intended to be full documentation, although it may be used as a source for such. It also describes the HAL as it is currently implemented for the architectures targeted in this release. It most closely describes the HALs for the MIPS, I386 and PowerPC HALs. Other architectures are similar but may not be organized precisely as described here.</P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="the-ecos-hardware-abstraction-layer.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="hal-architecture-variant-and-platform.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >The eCos Hardware Abstraction Layer (HAL)</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="the-ecos-hardware-abstraction-layer.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Architecture, Variant and Platform</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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