OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [user-guide/] [ecos-packages.html] - Rev 174

Compare with Previous | Blame | View Log

<!-- 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
>Packages</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
<META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="eCos User Guide"
HREF="ecos-user-guide.html"><LINK
REL="UP"
TITLE="Manual Configuration"
HREF="manual-configuration.html"><LINK
REL="PREVIOUS"
TITLE="Building the System"
HREF="building-the-system.html"><LINK
REL="NEXT"
TITLE="Coarse-grained Configuration"
HREF="coarse-grained-configuration.html"></HEAD
><BODY
CLASS="SECT1"
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 User Guide</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="building-the-system.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 28. Manual Configuration</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="coarse-grained-configuration.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="ECOS-PACKAGES">Packages</H1
><P
><SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is a component architecture. The system comes as a
	  number of packages which can be
	  enabled or disabled as required, and new packages can be
	  added as they become available. Unfortunately, the packages
	  are not completely independent: for example the &micro;ITRON
	  compatibility package relies almost entirely on
	  functionality provided by the kernel package, and it would
	  not make sense to try to build &micro;ITRON if the kernel
	  was disabled. The C library has fewer dependencies: some
	  parts of the C library rely on kernel functionality, but it
	  is possible to disable these parts and thus build a system
	  that has the C library but no kernel. The
	<B
CLASS="COMMAND"
>ecosconfig</B
> tool has the capability of
	    checking that all the dependencies are satisfied, but it
	    may still be possible to produce configurations that will
	    not build or (conceivably) that will build but not run.
	    Developers should be aware of this and take appropriate
	    care.</P
><P
>By default, <B
CLASS="COMMAND"
>ecosconfig</B
> will
include all packages that are appropriate for the specified hardware
in the configuration. The common HAL package and
the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> infrastructure must be present in every configuration. In
addition, it is always necessary to have one architectural HAL package
and one platform HAL package. Other packages are optional, and can
be added or removed from a configuration as required.</P
><P
>The application may not require all of the packages; for example,
it might not need the &micro;ITRON compatibility
package, or the floating point support provided by the math library.
There is a slight overhead when <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> is built because the packages
will get compiled, and there is also a small disk space penalty.
However, any unused facilities will get stripped out at link-time,
so having redundant packages will not affect the final executable. </P
></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="building-the-system.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecos-user-guide.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="coarse-grained-configuration.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Building the System</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="manual-configuration.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Coarse-grained Configuration</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>

Compare with Previous | Blame | View Log

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.