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CLASS="CHAPTER"
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><H1
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><H1
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><A
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><A
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NAME="ECOS-OVERVIEW">Chapter 2. <SPAN
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NAME="ECOS-OVERVIEW">Chapter 2. <SPAN
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CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> Overview</H1
|
> Overview</H1
|
><P
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><P
|
><SPAN
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><SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is an open source, configurable,
|
> is an open source, configurable,
|
portable, and royalty-free embedded real-time operating
|
portable, and royalty-free embedded real-time operating
|
system. The following text expands on these core aspects that
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system. The following text expands on these core aspects that
|
define <SPAN
|
define <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
>.</P
|
>.</P
|
><P
|
><P
|
><SPAN
|
><SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is provided as an open source
|
> is provided as an open source
|
runtime system supported by the GNU open source development
|
runtime system supported by the GNU open source development
|
tools. Developers have full and unfettered access to all
|
tools. Developers have full and unfettered access to all
|
aspects of the runtime system. No parts of it are proprietary
|
aspects of the runtime system. No parts of it are proprietary
|
or hidden, and you are at liberty to examine, add to, and
|
or hidden, and you are at liberty to examine, add to, and
|
modify the code as you deem necessary. These rights are
|
modify the code as you deem necessary. These rights are
|
granted to you and protected by the GNU Public License (GPL).
|
granted to you and protected by the GNU Public License (GPL).
|
An exception clause has been added to the eCos license which
|
An exception clause has been added to the eCos license which
|
limits the circumstances in which the license applies to other
|
limits the circumstances in which the license applies to other
|
code when used in conjunction with eCos. This exception grants
|
code when used in conjunction with eCos. This exception grants
|
you the right to freely develop and distribute applications
|
you the right to freely develop and distribute applications
|
based on <SPAN
|
based on <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
>. You are not expected
|
>. You are not expected
|
or required to make your embedded applications or any
|
or required to make your embedded applications or any
|
additional components that you develop freely available so
|
additional components that you develop freely available so
|
long as they are not derived from
|
long as they are not derived from
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> code. We of course welcome all
|
> code. We of course welcome all
|
contributions back to <SPAN
|
contributions back to <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> such as
|
> such as
|
board ports, device drivers and other components, as this
|
board ports, device drivers and other components, as this
|
helps the growth and development of
|
helps the growth and development of
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
>, and is of benefit to the
|
>, and is of benefit to the
|
entire <SPAN
|
entire <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> community. See <A
|
> community. See <A
|
HREF="ecos-licensing.html"
|
HREF="ecos-licensing.html"
|
>Chapter 3</A
|
>Chapter 3</A
|
> for more details.</P
|
> for more details.</P
|
><P
|
><P
|
>One of the key technological innovations in
|
>One of the key technological innovations in
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is the configuration
|
> is the configuration
|
system. The configuration system allows the application writer
|
system. The configuration system allows the application writer
|
to impose their requirements on the run-time components, both
|
to impose their requirements on the run-time components, both
|
in terms of their functionality and implementation, whereas
|
in terms of their functionality and implementation, whereas
|
traditionally the operating system has constrained the
|
traditionally the operating system has constrained the
|
application's own implementation. Essentially, this enables
|
application's own implementation. Essentially, this enables
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> developers to create their own
|
> developers to create their own
|
application-specific operating system and makes
|
application-specific operating system and makes
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> suitable for a wide range of
|
> suitable for a wide range of
|
embedded uses. Configuration also ensures that the resource
|
embedded uses. Configuration also ensures that the resource
|
footprint of <SPAN
|
footprint of <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is minimized as
|
> is minimized as
|
all unnecessary functionality and features are removed. The
|
all unnecessary functionality and features are removed. The
|
configuration system also presents
|
configuration system also presents
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> as a component
|
> as a component
|
architecture. This provides a standardized mechanism for
|
architecture. This provides a standardized mechanism for
|
component suppliers to extend the functionality of
|
component suppliers to extend the functionality of
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> and allows applications to be
|
> and allows applications to be
|
built from a wide set of optional configurable run-time
|
built from a wide set of optional configurable run-time
|
components. Components can be provided from a variety of
|
components. Components can be provided from a variety of
|
sources including: the standard
|
sources including: the standard
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> release; commercial third
|
> release; commercial third
|
party developers or open source contributors.</P
|
party developers or open source contributors.</P
|
><P
|
><P
|
>The royalty-free nature of <SPAN
|
>The royalty-free nature of <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> means that you can develop and
|
> means that you can develop and
|
deploy your application using the standard <SPAN
|
deploy your application using the standard <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> release without
|
> release without
|
incurring any royalty charges. In addition, there are no up-front
|
incurring any royalty charges. In addition, there are no up-front
|
license charges for the <SPAN
|
license charges for the <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> runtime source code and associated
|
> runtime source code and associated
|
tools. We provide, without charge, everything necessary for basic
|
tools. We provide, without charge, everything necessary for basic
|
embedded applications development.</P
|
embedded applications development.</P
|
><P
|
><P
|
><SPAN
|
><SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is designed to be portable to a
|
> is designed to be portable to a
|
wide range of target architectures and target platforms including 16,
|
wide range of target architectures and target platforms including 16,
|
32, and 64 bit architectures, MPUs, MCUs and DSPs. The
|
32, and 64 bit architectures, MPUs, MCUs and DSPs. The
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> kernel, libraries and runtime
|
> kernel, libraries and runtime
|
components are layered on the Hardware Abstraction Layer (HAL), and
|
components are layered on the Hardware Abstraction Layer (HAL), and
|
thus will run on any target once the HAL and relevant device drivers
|
thus will run on any target once the HAL and relevant device drivers
|
have been ported to the target's processor architecture and
|
have been ported to the target's processor architecture and
|
board. Currently <SPAN
|
board. Currently <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> supports a large
|
> supports a large
|
range of different target architectures:
|
range of different target architectures:
|
</P
|
</P
|
><P
|
><P
|
></P
|
></P
|
><UL
|
><UL
|
><LI
|
><LI
|
><P
|
><P
|
>ARM, Intel StrongARM and XScale</P
|
>ARM, Intel StrongARM and XScale</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Fujitsu FR-V</P
|
>Fujitsu FR-V</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Hitachi SH2/3/4</P
|
>Hitachi SH2/3/4</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Hitachi H8/300H </P
|
>Hitachi H8/300H </P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Intel x86</P
|
>Intel x86</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>MIPS</P
|
>MIPS</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Matsushita AM3x</P
|
>Matsushita AM3x</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Motorola PowerPC</P
|
>Motorola PowerPC</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Motorola 68k/Coldfire</P
|
>Motorola 68k/Coldfire</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>NEC V850</P
|
>NEC V850</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>Sun SPARC</P
|
>Sun SPARC</P
|
></LI
|
></LI
|
></UL
|
></UL
|
><P
|
><P
|
>including many of the popular variants of these architectures
|
>including many of the popular variants of these architectures
|
and evaluation boards.</P
|
and evaluation boards.</P
|
><P
|
><P
|
><SPAN
|
><SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> has been designed to support
|
> has been designed to support
|
applications with real-time requirements, providing features such as
|
applications with real-time requirements, providing features such as
|
full preemptability, minimal interrupt latencies, and all the
|
full preemptability, minimal interrupt latencies, and all the
|
necessary synchronization primitives, scheduling policies, and
|
necessary synchronization primitives, scheduling policies, and
|
interrupt handling mechanisms needed for these type of
|
interrupt handling mechanisms needed for these type of
|
applications. <SPAN
|
applications. <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> also provides all the
|
> also provides all the
|
functionality required for general embedded application support
|
functionality required for general embedded application support
|
including device drivers, memory management, exception handling, C,
|
including device drivers, memory management, exception handling, C,
|
math libraries, etc. In addition to runtime support, the
|
math libraries, etc. In addition to runtime support, the
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> system includes all the tools
|
> system includes all the tools
|
necessary to develop embedded applications, including
|
necessary to develop embedded applications, including
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> software configuration and build
|
> software configuration and build
|
tools, and GNU based compilers, assemblers, linkers, debuggers, and
|
tools, and GNU based compilers, assemblers, linkers, debuggers, and
|
simulators.</P
|
simulators.</P
|
><P
|
><P
|
>To get the most out of <SPAN
|
>To get the most out of <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> you
|
> you
|
should visit the <SPAN
|
should visit the <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> open source
|
> open source
|
developers site: <A
|
developers site: <A
|
HREF="http://sources.redhat.com/ecos/"
|
HREF="http://sources.redhat.com/ecos/"
|
TARGET="_top"
|
TARGET="_top"
|
>http://sources.redhat.com/ecos/</A
|
>http://sources.redhat.com/ecos/</A
|
>.</P
|
>.</P
|
><P
|
><P
|
>The site is dedicated to the <SPAN
|
>The site is dedicated to the <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
>
|
>
|
developer community and contains a rich set of resources
|
developer community and contains a rich set of resources
|
including news, FAQ, online documentation, installation guide,
|
including news, FAQ, online documentation, installation guide,
|
discussion and announcement mailing lists, and runtime and
|
discussion and announcement mailing lists, and runtime and
|
development tools downloads. The site also supports anonymous
|
development tools downloads. The site also supports anonymous
|
CVS and WEBCVS access to provide direct access to the latest
|
CVS and WEBCVS access to provide direct access to the latest
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> source base. </P
|
> source base. </P
|
><P
|
><P
|
><SPAN
|
><SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is released as open source
|
> is released as open source
|
software because we believe that this is the most effective
|
software because we believe that this is the most effective
|
software development model, and that it provides the greatest
|
software development model, and that it provides the greatest
|
benefit to the embedded developer community as a whole. As part
|
benefit to the embedded developer community as a whole. As part
|
of this endeavor, we seek the input and participation of
|
of this endeavor, we seek the input and participation of
|
<SPAN
|
<SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> developers in its continuing
|
> developers in its continuing
|
evolution. Participation can take many forms including:</P
|
evolution. Participation can take many forms including:</P
|
><P
|
><P
|
></P
|
></P
|
><UL
|
><UL
|
><LI
|
><LI
|
><P
|
><P
|
>providing us with feedback on how <SPAN
|
>providing us with feedback on how <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> might be made more
|
> might be made more
|
useful to you - by taking part in the ongoing mailing list discussions
|
useful to you - by taking part in the ongoing mailing list discussions
|
and by submitting problem reports covering bugs, documentation issues,
|
and by submitting problem reports covering bugs, documentation issues,
|
and missing features</P
|
and missing features</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>contributing bug fixes and enhancement patches</P
|
>contributing bug fixes and enhancement patches</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>contributing new code including device drivers, board
|
>contributing new code including device drivers, board
|
ports, libraries, and other runtime components</P
|
ports, libraries, and other runtime components</P
|
></LI
|
></LI
|
></UL
|
></UL
|
><P
|
><P
|
>Our long term aim is to make <SPAN
|
>Our long term aim is to make <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> a
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> a
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rich and ubiquitous standard infrastructure for the development of
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rich and ubiquitous standard infrastructure for the development of
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deeply embedded applications. This will be achieved with the
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deeply embedded applications. This will be achieved with the
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assistance of the <SPAN
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assistance of the <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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> developer community
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> developer community
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cooperating to improve <SPAN
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cooperating to improve <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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> for all. We
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> for all. We
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would like to take this opportunity to extend our thanks to the many
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would like to take this opportunity to extend our thanks to the many
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<SPAN
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<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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> developers who have already
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> developers who have already
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contributed feedback, ideas, patches, and code that have augmented and
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contributed feedback, ideas, patches, and code that have augmented and
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improved this release.</P
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improved this release.</P
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><P
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><P
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>eCos</SPAN
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>eCos</SPAN
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> Maintainers</I
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