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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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>Creating the Build Tree</TITLE
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>eCos User Guide</TH
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="manual-configuration.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 28. Manual Configuration</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="conflicts-and-constraints.html"
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>Next</A
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="CREATING-BUILD-TREE">Creating the Build Tree</H1
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><P
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>Generating a build tree is a non-trivial operation and
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          should not be attempted manually. Instead, <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> is shipped
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          with a tool called <B
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CLASS="COMMAND"
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>ecosconfig</B
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> that should
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          be used to create a build tree.</P
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><P
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>Usually <B
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CLASS="COMMAND"
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>ecosconfig</B
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> will be
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run inside the build tree itself. If you are creating a new build
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tree then typically you will create a new empty directory using
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the <B
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CLASS="COMMAND"
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>mkdir</B
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> command, <B
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CLASS="COMMAND"
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>cd</B
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> into
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that directory, and then invoke <B
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CLASS="COMMAND"
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>ecosconfig</B
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> to
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create a configuration. By default, the configuration is stored
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in a file <TT
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CLASS="FILENAME"
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>ecos.ecc</TT
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> in the current
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directory. The configuration may be modified by editing this file directly. <B
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CLASS="COMMAND"
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>ecosconfig</B
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> itself
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deals with a number of coarse-grained configuration options such
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as the target platform and the packages that should be used.</P
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><P
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>The <B
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CLASS="COMMAND"
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>ecosconfig</B
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> tool is also
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used subsequently to generate a build tree for a configuration.
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Once a build tree exists, it is possible to run <B
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CLASS="COMMAND"
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>ecosconfig</B
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> again
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inside the same build tree. This will be necessary if your wish
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to change some of the configuration options.</P
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><P
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><B
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CLASS="COMMAND"
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>ecosconfig</B
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> does not generate
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the top-level directory of the build tree; you must do this
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        yourself. </P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>$ mkdir ecos-work
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$ cd ecos-work</PRE
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></TD
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></TR
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></TABLE
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><P
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>The next step is to run <B
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CLASS="COMMAND"
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>ecosconfig</B
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>: </P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>$ ecosconfig &lt;qualifiers&gt; &lt;command&gt;</PRE
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></TD
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></TR
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></TABLE
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN2416">ecosconfig qualifiers</H2
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><P
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>The available command line qualifiers for
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            <B
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CLASS="COMMAND"
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>ecosconfig</B
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> are as follows. Multiple
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            qualifiers may be used on the command line:
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          </P
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><P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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><TT
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CLASS="OPTION"
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>--help</TT
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></DT
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><DD
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><P
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>Provides basic usage guidelines for the
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              available commands and qualifiers.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--config=&lt;file&gt;</TT
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></DT
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><DD
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><P
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>Specifies an <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration save file for
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                  use by the tool. By default, the file
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                  <TT
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CLASS="FILENAME"
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>ecos.ecc</TT
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> in the
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                  current directory is used. Developers may prefer to
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                  use a common location for all their <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>
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                  configurations rather than keep the configuration
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                  information in the base of the build tree.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--prefix=&lt;dir&gt;</TT
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></DT
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><DD
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><P
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>Specifies an alternative location for the
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                  install tree. By default, the install tree resides
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                  inside the <TT
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CLASS="FILENAME"
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>install</TT
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>
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                  directory in the build tree. Developers may prefer
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                  to locate the build tree in a temporary file
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                  hierarchy but keep the install tree in a more
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                  permanent location.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--srcdir=&lt;dir&gt;</TT
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></DT
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><DD
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><P
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>Specifies the location of the component
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                  repository. By default, the tool uses the location
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                  specified in the
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                  <TT
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CLASS="REPLACEABLE"
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><I
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>ECOS_REPOSITORY</I
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></TT
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>
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                  environment variable. Developers may prefer to use
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                  of this qualifier if they are working with more than
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                  one repository.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--no-resolve</TT
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></DT
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><DD
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><P
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>Disables the implicit resolution of conflicts
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                  while manipulating the configuration data.
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                  developers may prefer to resolve conflicts by
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                  editing the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration save file
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                  manually.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--ignore-errors</TT
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>, <TT
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CLASS="OPTION"
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>-i</TT
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></DT
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><DD
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><P
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>By default, ecosconfig will exit with an error code if the current
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configuration contains any conflicts, and it is not possible to
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generate or update a build tree for such configurations. This
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qualifier causes ecosconfig to ignore such problems, and hence it is
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possible to generate a build tree even if there are still
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conflicts. Of course, there are no guarantees that the resulting
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system will actually do anything.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--verbose</TT
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>, <TT
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CLASS="OPTION"
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>-v</TT
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></DT
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><DD
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><P
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>Display more information.</P
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></DD
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><DT
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><TT
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CLASS="OPTION"
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>--quiet</TT
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>, <TT
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CLASS="OPTION"
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>-q</TT
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></DT
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><DD
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><P
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>Display less information.</P
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></DD
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></DL
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></DIV
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><P
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>The <TT
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CLASS="OPTION"
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>--config</TT
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>, <TT
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CLASS="OPTION"
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>--prefix</TT
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> and
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<TT
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CLASS="OPTION"
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>--srcdir</TT
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> qualifiers can also be written with two arguments,
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for example:</P
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><TABLE
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>ecosconfig --srcdir <TT
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CLASS="REPLACEABLE"
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><I
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>&lt;dir&gt;</I
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></TT
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> ...</PRE
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></TD
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></TR
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></TABLE
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><P
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>This simplifies filename completion with some shells.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN2480">ecosconfig commands</H2
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><P
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>The available commands for
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            <B
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CLASS="COMMAND"
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>ecosconfig</B
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> are as
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            follows:</P
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><P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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><B
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CLASS="COMMAND"
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>list</B
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></DT
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><DD
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><P
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>Lists the available packages, targets and
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                  templates as installed in the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> repository.
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                  Aliases and package versions are also
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                  reported.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>new &lt;target&gt; [&lt;template&gt; [&lt;version&gt;]]</B
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></DT
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><DD
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><P
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>Creates a new <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration for
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                  the specified target hardware and saves it. A
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                  software template may also be specified. By default,
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                  the template named &#8216;default&#8217; is used. If
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                  the template version is not specified, the latest
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                  version is used.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>target &lt;target&gt;</B
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></DT
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><DD
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><P
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>Changes the target hardware selection
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                  for the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration. This has the effect of
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                  unloading packages supporting the target selected
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                  previously and loading the packages which support
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                  the new hardware. This command will be used
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                  typically when switching between a simulator and
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                  real hardware.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>template &lt;template&gt; [&lt;version&gt;]</B
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></DT
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><DD
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><P
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>Changes the template selection for the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>
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                  configuration. This has the effect of unloading
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                  packages specified by the template selected
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                  previously and loading the packages specified by the
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                  new template. By default, the latest version of the
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                  specified template is used.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>remove &lt;packages&gt;</B
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></DT
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><DD
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><P
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>Removes the specified packages from the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>
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                  configuration. This command will be used typically
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                  when the template on which a configuration is based
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                  contains packages which are not required.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>add &lt;packages&gt;</B
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></DT
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><DD
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><P
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>Adds the specified packages to the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration. This
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command will be used typically when the template on which a
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configuration is based does not contain all the packages which are
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required.For example, add-on packages provided by third parties will
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not be known to the standard templates, so they will have to be added
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explicitly. </P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>version &lt;version&gt; &lt;packages&gt;</B
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></DT
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><DD
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><P
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>Selects the specified version of a
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                  number of packages in the <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration. By
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                  default, the most recent version of each package is
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                  used. This command will be used typically when an
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                  older version of a package is required.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>check</B
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></DT
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><DD
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><P
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>Presents the following information
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                  concerning the current configuration:</P
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><P
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></P
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><OL
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TYPE="1"
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><LI
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><P
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>the selected target hardware</P
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></LI
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><LI
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><P
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>the selected template</P
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></LI
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><LI
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><P
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>additional packages</P
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></LI
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><LI
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><P
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>removed packages</P
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></LI
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><LI
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><P
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>the selected version of packages
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                      where this is not the most recent
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                      version</P
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></LI
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><LI
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><P
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>conflicts in the current configuration</P
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></LI
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></OL
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>resolve</B
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></DT
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><DD
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><P
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>Resolves conflicts identified in the
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                  current <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration by invoking an inference
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                  capability. Resolved conflicts are reported, but not
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                  all conflicts may be resolvable. This command will
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                  be used typically following manual editing of the
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                  configuration.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>export &lt;file&gt;</B
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></DT
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><DD
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><P
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>Exports a minimal <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration
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                  save file with the specified name. This file
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                  contains only those options which do not have their
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                  default value. Such files are used typically to
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                  transfer option values from one configuration to
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                  another.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>import &lt;file&gt;</B
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></DT
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><DD
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><P
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>Imports a minimal <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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> configuration
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                  save file with the specified name. The values of
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                  those options specified in the file are applied to
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                  the current configuration.</P
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></DD
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><DT
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><B
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CLASS="COMMAND"
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>tree</B
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></DT
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><DD
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><P
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>Generates a build tree based on the current <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>
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                  configuration. This command will be used typically
594
                  just before building <SPAN
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>.Normally a build tree can
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only be generated if if the configuration has no unresolved
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conflicts, but <TT
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CLASS="OPTION"
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>--ignore-errors</TT
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> can be used to override
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this.</P
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></DD
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></DL
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></DIV
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></DIV
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></DIV
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><DIV
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>Prev</A
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ALIGN="center"
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>Home</A
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ALIGN="left"
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>Manual Configuration</TD
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><TD
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ALIGN="center"
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>Up</A
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>Conflicts and constraints</TD
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