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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><H1
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><A
NAME="CDL-CONFLICTS">Conflicts</H1
><P
>Not all settings of configuration items will lead to a
          coherent configuration; for example, the use of a timeout
          facility might require the existence of timer support, so if
          the one is required the other cannot be removed.  Coherence
          is policed by means of consistency rules (in particular, the
          goal expressions that appear as CDL items
          <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>requires</I
></SPAN
> and
          <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>active_if</I
></SPAN
> attributes [see
          above]).  A violation of consistency rules creates a
          <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>conflict</I
></SPAN
>, which must be resolved in
          order to ensure a consistent configuration. Conflict
          resolution can be performed manually or with the assistance
          of the <SPAN
CLASS="PRODUCTNAME"
>eCos</SPAN
> tools.  Conflicts come in the following
          flavors:</P
><P
></P
><UL
><LI
><P
>An <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>unresolved</I
></SPAN
> conflict means that
there is a reference to an entity that is not yet in the current
configuration </P
></LI
><LI
><P
>An <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>illegal value</I
></SPAN
> conflict is caused
when a configuration item is set to a value that is not permitted
(that is, a <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>legal_values</I
></SPAN
> goal expression
is failing) </P
></LI
><LI
><P
>An <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>evaluation exception</I
></SPAN
> conflict
is caused when the evaluation of an expression would fail (for example,
because of a division by zero) </P
></LI
><LI
><P
>An <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>unsatisfied goal</I
></SPAN
> conflict is caused
by a failing <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>requires</I
></SPAN
> goal expression </P
></LI
><LI
><P
>A <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>bad data</I
></SPAN
> conflict arises only rarely,
and corresponds to badly constructed CDL.  Such a conflict can only
be resolved by reference to the CDL writer.</P
></LI
></UL
></DIV
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>

Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Conflicts</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
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18			`REL="HOME"`
19			`TITLE="eCos User Guide"`
20			`HREF="ecos-user-guide.html"><LINK`
21			`REL="UP"`
22			`TITLE="CDL Concepts"`
23			`HREF="cdl-concepts.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Configuration Items"`
26			`HREF="cdl-configuration-items.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Templates"`
29			`HREF="cdl-templates.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
32			`BGCOLOR="#FFFFFF"`
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35			`VLINK="#840084"`
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44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos User Guide</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
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58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 24. CDL Concepts</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="cdl-templates.html"`
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73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="CDL-CONFLICTS">Conflicts</H1`
86			`><P`
87			`>Not all settings of configuration items will lead to a`
88			`coherent configuration; for example, the use of a timeout`
89			`facility might require the existence of timer support, so if`
90			`the one is required the other cannot be removed. Coherence`
91			`is policed by means of consistency rules (in particular, the`
92			`goal expressions that appear as CDL items`
93			`<SPAN`
94			`CLASS="emphasis"`
95			`><I`
96			`CLASS="EMPHASIS"`
97			`>requires</I`
98			`></SPAN`
99			`> and`
100			`<SPAN`
101			`CLASS="emphasis"`
102			`><I`
103			`CLASS="EMPHASIS"`
104			`>active_if</I`
105			`></SPAN`
106			`> attributes [see`
107			`above]). A violation of consistency rules creates a`
108			`<SPAN`
109			`CLASS="emphasis"`
110			`><I`
111			`CLASS="EMPHASIS"`
112			`>conflict</I`
113			`></SPAN`
114			`>, which must be resolved in`
115			`order to ensure a consistent configuration. Conflict`
116			`resolution can be performed manually or with the assistance`
117			`of the <SPAN`
118			`CLASS="PRODUCTNAME"`
119			`>eCos</SPAN`
120			`> tools. Conflicts come in the following`
121			`flavors:</P`
122			`><P`
123			`></P`
124			`><UL`
125			`><LI`
126			`><P`
127			`>An <SPAN`
128			`CLASS="emphasis"`
129			`><I`
130			`CLASS="EMPHASIS"`
131			`>unresolved</I`
132			`></SPAN`
133			`> conflict means that`
134			`there is a reference to an entity that is not yet in the current`
135			`configuration </P`
136			`></LI`
137			`><LI`
138			`><P`
139			`>An <SPAN`
140			`CLASS="emphasis"`
141			`><I`
142			`CLASS="EMPHASIS"`
143			`>illegal value</I`
144			`></SPAN`
145			`> conflict is caused`
146			`when a configuration item is set to a value that is not permitted`
147			`(that is, a <SPAN`
148			`CLASS="emphasis"`
149			`><I`
150			`CLASS="EMPHASIS"`
151			`>legal_values</I`
152			`></SPAN`
153			`> goal expression`
154			`is failing) </P`
155			`></LI`
156			`><LI`
157			`><P`
158			`>An <SPAN`
159			`CLASS="emphasis"`
160			`><I`
161			`CLASS="EMPHASIS"`
162			`>evaluation exception</I`
163			`></SPAN`
164			`> conflict`
165			`is caused when the evaluation of an expression would fail (for example,`
166			`because of a division by zero) </P`
167			`></LI`
168			`><LI`
169			`><P`
170			`>An <SPAN`
171			`CLASS="emphasis"`
172			`><I`
173			`CLASS="EMPHASIS"`
174			`>unsatisfied goal</I`
175			`></SPAN`
176			`> conflict is caused`
177			`by a failing <SPAN`
178			`CLASS="emphasis"`
179			`><I`
180			`CLASS="EMPHASIS"`
181			`>requires</I`
182			`></SPAN`
183			`> goal expression </P`
184			`></LI`
185			`><LI`
186			`><P`
187			`>A <SPAN`
188			`CLASS="emphasis"`
189			`><I`
190			`CLASS="EMPHASIS"`
191			`>bad data</I`
192			`></SPAN`
193			`> conflict arises only rarely,`
194			`and corresponds to badly constructed CDL. Such a conflict can only`
195			`be resolved by reference to the CDL writer.</P`
196			`></LI`
197			`></UL`
198			`></DIV`
199			`><DIV`
200			`CLASS="NAVFOOTER"`
201			`><HR`
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203			`WIDTH="100%"><TABLE`
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219			`><TD`
220			`WIDTH="34%"`
221			`ALIGN="center"`
222			`VALIGN="top"`
223			`><A`
224			`HREF="ecos-user-guide.html"`
225			`ACCESSKEY="H"`
226			`>Home</A`
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229			`WIDTH="33%"`
230			`ALIGN="right"`
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233			`HREF="cdl-templates.html"`
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235			`>Next</A`
236			`></TD`
237			`></TR`
238			`><TR`
239			`><TD`
240			`WIDTH="33%"`
241			`ALIGN="left"`
242			`VALIGN="top"`
243			`>Configuration Items</TD`
244			`><TD`
245			`WIDTH="34%"`
246			`ALIGN="center"`
247			`VALIGN="top"`
248			`><A`
249			`HREF="cdl-concepts.html"`
250			`ACCESSKEY="U"`
251			`>Up</A`
252			`></TD`
253			`><TD`
254			`WIDTH="33%"`
255			`ALIGN="right"`
256			`VALIGN="top"`
257			`>Templates</TD`
258			`></TR`
259			`></TABLE`
260			`></DIV`
261			`></BODY`
262			`></HTML`
263			`>`

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