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>Configuration Items</TITLE
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>eCos User Guide</TH
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>eCos User Guide</TH
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>Chapter 24. CDL Concepts</TD
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>Chapter 24. CDL Concepts</TD
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><DIV
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CLASS="SECT1"
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><H1
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><H1
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CLASS="SECT1"
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CLASS="SECT1"
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><A
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><A
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NAME="CDL-CONFIGURATION-ITEMS">Configuration Items</H1
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NAME="CDL-CONFIGURATION-ITEMS">Configuration Items</H1
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><P
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><P
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>Configuration items</I
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>Configuration items</I
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></SPAN
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></SPAN
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> are the
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> are the
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individual entities that form a configuration. Each item
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individual entities that form a configuration. Each item
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corresponds to the setting of a C pre-processor macro (for
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corresponds to the setting of a C pre-processor macro (for
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example,
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example,
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<TT
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<TT
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CLASS="LITERAL"
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CLASS="LITERAL"
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>CYGHWR_HAL_ARM_PID_GDB_BAUD</TT
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>CYGHWR_HAL_ARM_PID_GDB_BAUD</TT
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>).
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>).
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The code of <SPAN
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The code of <SPAN
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CLASS="PRODUCTNAME"
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CLASS="PRODUCTNAME"
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>eCos</SPAN
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>eCos</SPAN
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> itself is written to test such pre-processor
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> itself is written to test such pre-processor
|
macros so as to tailor the code. User code can do
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macros so as to tailor the code. User code can do
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likewise.</P
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likewise.</P
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><P
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><P
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>Configuration items come in the following flavors:</P
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>Configuration items come in the following flavors:</P
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><P
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><P
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></P
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></P
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><UL
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><UL
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><LI
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><LI
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><P
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><P
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>None</I
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>None</I
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></SPAN
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></SPAN
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>: such entities serve only as
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>: such entities serve only as
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place holders in the hierarchy, allowing other entities to be grouped
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place holders in the hierarchy, allowing other entities to be grouped
|
more easily.</P
|
more easily.</P
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></LI
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></LI
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><LI
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><LI
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><P
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><P
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><SPAN
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><SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
|
>Boolean</I
|
>Boolean</I
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></SPAN
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></SPAN
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> entities are the most common
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> entities are the most common
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flavor; they correspond to units of functionality that can be either
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flavor; they correspond to units of functionality that can be either
|
enabled or disabled. If the entity is enabled then there will be
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enabled or disabled. If the entity is enabled then there will be
|
a #define; code will check the setting using, for example, #ifdef</P
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a #define; code will check the setting using, for example, #ifdef</P
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></LI
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></LI
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><LI
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><LI
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><P
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><P
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><SPAN
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><SPAN
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CLASS="emphasis"
|
CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
|
>Data</I
|
>Data</I
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></SPAN
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></SPAN
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> entities encapsulate some arbitrary
|
> entities encapsulate some arbitrary
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data. Other properties such as a set or range of legal values can
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data. Other properties such as a set or range of legal values can
|
be used to constrain the actual values, for example to an integer
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be used to constrain the actual values, for example to an integer
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or floating point value within a certain range.</P
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or floating point value within a certain range.</P
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></LI
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></LI
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><LI
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><LI
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><P
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><P
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
|
>Booldata</I
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>Booldata</I
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></SPAN
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></SPAN
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> entities combine the attributes
|
> entities combine the attributes
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of <SPAN
|
of <SPAN
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CLASS="emphasis"
|
CLASS="emphasis"
|
><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
|
>Boolean</I
|
>Boolean</I
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></SPAN
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></SPAN
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> and <SPAN
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> and <SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
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><I
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CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>Data</I
|
>Data</I
|
></SPAN
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></SPAN
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>: they
|
>: they
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can be enabled or disabled and, if enabled, will hold a data value.</P
|
can be enabled or disabled and, if enabled, will hold a data value.</P
|
></LI
|
></LI
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></UL
|
></UL
|
><P
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><P
|
>Like packages, configuration items exist in a tree-based hierarchy:
|
>Like packages, configuration items exist in a tree-based hierarchy:
|
each configuration item has a parent which may be another configuration
|
each configuration item has a parent which may be another configuration
|
item or a package. Under some conditions (such as when packages
|
item or a package. Under some conditions (such as when packages
|
are added or removed from a configuration), items may be “re-parented” such
|
are added or removed from a configuration), items may be “re-parented” such
|
that their position in the tree changes. </P
|
that their position in the tree changes. </P
|
><DIV
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><DIV
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CLASS="SECT2"
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CLASS="SECT2"
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><H2
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><H2
|
CLASS="SECT2"
|
CLASS="SECT2"
|
><A
|
><A
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NAME="AEN1898">Expressions</H2
|
NAME="AEN1898">Expressions</H2
|
><P
|
><P
|
>Expressions are relationships between CDL items. There are
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>Expressions are relationships between CDL items. There are
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three types of expression in CDL:</P
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three types of expression in CDL:</P
|
><DIV
|
><DIV
|
CLASS="TABLE"
|
CLASS="TABLE"
|
><A
|
><A
|
NAME="CDL-EXPRESSIONS"><P
|
NAME="CDL-EXPRESSIONS"><P
|
><B
|
><B
|
>Table 24-1. CDL Expressions</B
|
>Table 24-1. CDL Expressions</B
|
></P
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></P
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><TABLE
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><TABLE
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BORDER="1"
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CLASS="CALSTABLE"
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CLASS="CALSTABLE"
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><THEAD
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><THEAD
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><TR
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><TR
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><TH
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><TH
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ALIGN="LEFT"
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ALIGN="LEFT"
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VALIGN="TOP"
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VALIGN="TOP"
|
>Expression Type</TH
|
>Expression Type</TH
|
><TH
|
><TH
|
ALIGN="LEFT"
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ALIGN="LEFT"
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VALIGN="TOP"
|
VALIGN="TOP"
|
>Result</TH
|
>Result</TH
|
><TH
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><TH
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ALIGN="LEFT"
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ALIGN="LEFT"
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VALIGN="TOP"
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VALIGN="TOP"
|
>Common Use (see <A
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>Common Use (see <A
|
HREF="cdl-configuration-items.html#TABLE-CONFIGURATION-PROPERTIES"
|
HREF="cdl-configuration-items.html#TABLE-CONFIGURATION-PROPERTIES"
|
>Table 24-2</A
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>Table 24-2</A
|
>)</TH
|
>)</TH
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></TR
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></TR
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></THEAD
|
></THEAD
|
><TBODY
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><TBODY
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><TR
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><TR
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><TD
|
><TD
|
ALIGN="LEFT"
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ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Ordinary</TD
|
>Ordinary</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>A single value</TD
|
>A single value</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>legal_values property</TD
|
>legal_values property</TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>List</TD
|
>List</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>A range of
|
>A range of
|
values (for example “1 to 10”)</TD
|
values (for example “1 to 10”)</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>legal_values property </TD
|
>legal_values property </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Goal</TD
|
>Goal</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>True or False</TD
|
>True or False</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>requires and active_if properties</TD
|
>requires and active_if properties</TD
|
></TR
|
></TR
|
></TBODY
|
></TBODY
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="SECT2"
|
CLASS="SECT2"
|
><H2
|
><H2
|
CLASS="SECT2"
|
CLASS="SECT2"
|
><A
|
><A
|
NAME="AEN1923">Properties</H2
|
NAME="AEN1923">Properties</H2
|
><P
|
><P
|
>Each configuration item has a set of properties. The following
|
>Each configuration item has a set of properties. The following
|
table describes the most commonly used:</P
|
table describes the most commonly used:</P
|
><DIV
|
><DIV
|
CLASS="TABLE"
|
CLASS="TABLE"
|
><A
|
><A
|
NAME="TABLE-CONFIGURATION-PROPERTIES"><P
|
NAME="TABLE-CONFIGURATION-PROPERTIES"><P
|
><B
|
><B
|
>Table 24-2. Configuration properties</B
|
>Table 24-2. Configuration properties</B
|
></P
|
></P
|
><TABLE
|
><TABLE
|
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><THEAD
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><THEAD
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><TR
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><TR
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><TH
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><TH
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ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
><SPAN
|
><SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>Property</I
|
>Property</I
|
></SPAN
|
></SPAN
|
></TH
|
></TH
|
><TH
|
><TH
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
><SPAN
|
><SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>Use </I
|
>Use </I
|
></SPAN
|
></SPAN
|
></TH
|
></TH
|
></TR
|
></TR
|
></THEAD
|
></THEAD
|
><TBODY
|
><TBODY
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><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Flavor</TD
|
>Flavor</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>The “type” of the item, as
|
>The “type” of the item, as
|
described above </TD
|
described above </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Enabled</TD
|
>Enabled</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Whether
|
>Whether
|
the item is enabled </TD
|
the item is enabled </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Current_value</TD
|
>Current_value</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>The current value of the item </TD
|
>The current value of the item </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Default_value</TD
|
>Default_value</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>An ordinary expression defining the default value of the
|
>An ordinary expression defining the default value of the
|
item</TD
|
item</TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Legal_values</TD
|
>Legal_values</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>A
|
>A
|
list expression defining the values the item may hold (for example,
|
list expression defining the values the item may hold (for example,
|
1 to10) </TD
|
1 to10) </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Active_if</TD
|
>Active_if</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>A
|
>A
|
goal expression denoting the requirement for this item to be active
|
goal expression denoting the requirement for this item to be active
|
(see below: <SPAN
|
(see below: <SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>Inactive Items</I
|
>Inactive Items</I
|
></SPAN
|
></SPAN
|
>) </TD
|
>) </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Requires</TD
|
>Requires</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>A goal
|
>A goal
|
expression denoting requirements this item places on others (see
|
expression denoting requirements this item places on others (see
|
below: <SPAN
|
below: <SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>Conflicts</I
|
>Conflicts</I
|
></SPAN
|
></SPAN
|
>) </TD
|
>) </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Calculated</TD
|
>Calculated</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Whether
|
>Whether
|
the item as non-modifiable </TD
|
the item as non-modifiable </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Macro</TD
|
>Macro</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>The corresponding
|
>The corresponding
|
C pre-processor macro </TD
|
C pre-processor macro </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>File</TD
|
>File</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>The C header
|
>The C header
|
file in which the macro is defined </TD
|
file in which the macro is defined </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>URL</TD
|
>URL</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>The URL of
|
>The URL of
|
a documentation page describing the item </TD
|
a documentation page describing the item </TD
|
></TR
|
></TR
|
><TR
|
><TR
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Hardware</TD
|
>Hardware</TD
|
><TD
|
><TD
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
VALIGN="TOP"
|
VALIGN="TOP"
|
>Indicates
|
>Indicates
|
that a particular package is related to specific hardware</TD
|
that a particular package is related to specific hardware</TD
|
></TR
|
></TR
|
></TBODY
|
></TBODY
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
><P
|
><P
|
>A complete description of properties is contained in the <I
|
>A complete description of properties is contained in the <I
|
CLASS="CITETITLE"
|
CLASS="CITETITLE"
|
>Component
|
>Component
|
Writer’s Guide</I
|
Writer’s Guide</I
|
>.</P
|
>.</P
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="SECT2"
|
CLASS="SECT2"
|
><H2
|
><H2
|
CLASS="SECT2"
|
CLASS="SECT2"
|
><A
|
><A
|
NAME="AEN1976">Inactive Items</H2
|
NAME="AEN1976">Inactive Items</H2
|
><P
|
><P
|
>Descendants of an item that is disabled are inactive: their
|
>Descendants of an item that is disabled are inactive: their
|
values may not be changed. Items may also become <SPAN
|
values may not be changed. Items may also become <SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>inactive</I
|
>inactive</I
|
></SPAN
|
></SPAN
|
> if
|
> if
|
an active_if expression is used to make the item dependent
|
an active_if expression is used to make the item dependent
|
on an expression involving other items. </P
|
on an expression involving other items. </P
|
></DIV
|
></DIV
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="NAVFOOTER"
|
CLASS="NAVFOOTER"
|
><HR
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|
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|
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|
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|
><TD
|
><TD
|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="left"
|
ALIGN="left"
|
VALIGN="top"
|
VALIGN="top"
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><A
|
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|
HREF="cdl-packages.html"
|
HREF="cdl-packages.html"
|
ACCESSKEY="P"
|
ACCESSKEY="P"
|
>Prev</A
|
>Prev</A
|
></TD
|
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|
><TD
|
><TD
|
WIDTH="34%"
|
WIDTH="34%"
|
ALIGN="center"
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ALIGN="center"
|
VALIGN="top"
|
VALIGN="top"
|
><A
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|
HREF="ecos-user-guide.html"
|
HREF="ecos-user-guide.html"
|
ACCESSKEY="H"
|
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|
>Home</A
|
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|
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|
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|
><TD
|
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|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="right"
|
ALIGN="right"
|
VALIGN="top"
|
VALIGN="top"
|
><A
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|
HREF="cdl-conflicts.html"
|
HREF="cdl-conflicts.html"
|
ACCESSKEY="N"
|
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|
>Next</A
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|
WIDTH="33%"
|
WIDTH="33%"
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ALIGN="left"
|
ALIGN="left"
|
VALIGN="top"
|
VALIGN="top"
|
>Packages</TD
|
>Packages</TD
|
><TD
|
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|
WIDTH="34%"
|
WIDTH="34%"
|
ALIGN="center"
|
ALIGN="center"
|
VALIGN="top"
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><A
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|
HREF="cdl-concepts.html"
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HREF="cdl-concepts.html"
|
ACCESSKEY="U"
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ACCESSKEY="U"
|
>Up</A
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|
WIDTH="33%"
|
WIDTH="33%"
|
ALIGN="right"
|
ALIGN="right"
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VALIGN="top"
|
VALIGN="top"
|
>Conflicts</TD
|
>Conflicts</TD
|
></TR
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