+++ /dev/null
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-<HTML
-><HEAD
-><TITLE
->eCos Overview</TITLE
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-TITLE="Introduction"
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-REL="PREVIOUS"
-TITLE="Key Features"
-HREF="ecos-key-features.html"><LINK
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-TITLE="eCos Licence Overview"
-HREF="ecos-licensing.html"></HEAD
-><BODY
-CLASS="CHAPTER"
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-VLINK="#840084"
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->eCos User Guide</TH
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-><DIV
-CLASS="CHAPTER"
-><H1
-><A
-NAME="ECOS-OVERVIEW">Chapter 2. <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> Overview</H1
-><P
-><SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is an open source, configurable,
- portable, and royalty-free embedded real-time operating
- system. The following text expands on these core aspects that
- define <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
->.</P
-><P
-><SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is provided as an open source
- runtime system supported by the GNU open source development
- tools. Developers have full and unfettered access to all
- aspects of the runtime system. No parts of it are proprietary
- or hidden, and you are at liberty to examine, add to, and
- modify the code as you deem necessary. These rights are
- granted to you and protected by the GNU Public License (GPL).
- An exception clause has been added to the eCos license which
- limits the circumstances in which the license applies to other
- code when used in conjunction with eCos. This exception grants
- you the right to freely develop and distribute applications
- based on <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
->. You are not expected
- or required to make your embedded applications or any
- additional components that you develop freely available so
- long as they are not derived from
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> code. We of course welcome all
- contributions back to <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> such as
- board ports, device drivers and other components, as this
- helps the growth and development of
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
->, and is of benefit to the
- entire <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> community. See <A
-HREF="ecos-licensing.html"
->Chapter 3</A
-> for more details.</P
-><P
->One of the key technological innovations in
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is the configuration
- system. The configuration system allows the application writer
- to impose their requirements on the run-time components, both
- in terms of their functionality and implementation, whereas
- traditionally the operating system has constrained the
- application's own implementation. Essentially, this enables
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> developers to create their own
- application-specific operating system and makes
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> suitable for a wide range of
- embedded uses. Configuration also ensures that the resource
- footprint of <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is minimized as
- all unnecessary functionality and features are removed. The
- configuration system also presents
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> as a component
- architecture. This provides a standardized mechanism for
- component suppliers to extend the functionality of
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> and allows applications to be
- built from a wide set of optional configurable run-time
- components. Components can be provided from a variety of
- sources including: the standard
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> release; commercial third
- party developers or open source contributors.</P
-><P
->The royalty-free nature of <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> means that you can develop and
-deploy your application using the standard <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> release without
-incurring any royalty charges. In addition, there are no up-front
-license charges for the <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> runtime source code and associated
-tools. We provide, without charge, everything necessary for basic
-embedded applications development.</P
-><P
-><SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is designed to be portable to a
-wide range of target architectures and target platforms including 16,
-32, and 64 bit architectures, MPUs, MCUs and DSPs. The
-<SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> kernel, libraries and runtime
-components are layered on the Hardware Abstraction Layer (HAL), and
-thus will run on any target once the HAL and relevant device drivers
-have been ported to the target's processor architecture and
-board. Currently <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> supports a large
-range of different target architectures:
- </P
-><P
-></P
-><UL
-><LI
-><P
->ARM, Intel StrongARM and XScale</P
-></LI
-><LI
-><P
->Fujitsu FR-V</P
-></LI
-><LI
-><P
->Hitachi SH2/3/4</P
-></LI
-><LI
-><P
->Hitachi H8/300H </P
-></LI
-><LI
-><P
->Intel x86</P
-></LI
-><LI
-><P
->MIPS</P
-></LI
-><LI
-><P
->Matsushita AM3x</P
-></LI
-><LI
-><P
->Motorola PowerPC</P
-></LI
-><LI
-><P
->Motorola 68k/Coldfire</P
-></LI
-><LI
-><P
->NEC V850</P
-></LI
-><LI
-><P
->Sun SPARC</P
-></LI
-></UL
-><P
->including many of the popular variants of these architectures
-and evaluation boards.</P
-><P
-><SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> has been designed to support
-applications with real-time requirements, providing features such as
-full preemptability, minimal interrupt latencies, and all the
-necessary synchronization primitives, scheduling policies, and
-interrupt handling mechanisms needed for these type of
-applications. <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> also provides all the
-functionality required for general embedded application support
-including device drivers, memory management, exception handling, C,
-math libraries, etc. In addition to runtime support, the
-<SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> system includes all the tools
-necessary to develop embedded applications, including
-<SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> software configuration and build
-tools, and GNU based compilers, assemblers, linkers, debuggers, and
-simulators.</P
-><P
->To get the most out of <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> you
-should visit the <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> open source
-developers site: <A
-HREF="http://sources.redhat.com/ecos/"
-TARGET="_top"
->http://sources.redhat.com/ecos/</A
->.</P
-><P
->The site is dedicated to the <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
->
- developer community and contains a rich set of resources
- including news, FAQ, online documentation, installation guide,
- discussion and announcement mailing lists, and runtime and
- development tools downloads. The site also supports anonymous
- CVS and WEBCVS access to provide direct access to the latest
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> source base. </P
-><P
-><SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> is released as open source
- software because we believe that this is the most effective
- software development model, and that it provides the greatest
- benefit to the embedded developer community as a whole. As part
- of this endeavor, we seek the input and participation of
- <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> developers in its continuing
- evolution. Participation can take many forms including:</P
-><P
-></P
-><UL
-><LI
-><P
->providing us with feedback on how <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> might be made more
-useful to you - by taking part in the ongoing mailing list discussions
-and by submitting problem reports covering bugs, documentation issues,
-and missing features</P
-></LI
-><LI
-><P
->contributing bug fixes and enhancement patches</P
-></LI
-><LI
-><P
->contributing new code including device drivers, board
-ports, libraries, and other runtime components</P
-></LI
-></UL
-><P
->Our long term aim is to make <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> a
-rich and ubiquitous standard infrastructure for the development of
-deeply embedded applications. This will be achieved with the
-assistance of the <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> developer community
-cooperating to improve <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> for all. We
-would like to take this opportunity to extend our thanks to the many
-<SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> developers who have already
-contributed feedback, ideas, patches, and code that have augmented and
-improved this release.</P
-><P
-><SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->The <SPAN
-CLASS="PRODUCTNAME"
->eCos</SPAN
-> Maintainers</I
-></SPAN
-></P
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->Key Features</TD
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->Up</A
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