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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@50 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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<hr>
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<h1>Overview</h1>
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<p>
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<b>Goals</b>.
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Nuttx is a real timed embedded operating system (RTOS).
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Its goals are:
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<p>
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<ol>
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<li>A very small footprint usable in all but the tightest micro-controller environments,</li>
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<li>Fully scalable from tiny (8-bit) to moderate embedded (32-bit),</li>
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<li>High degree of standards compliance.</li>
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<li>Totally open.</li>
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<li><b>Small Footprint</b></li>
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<p>
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Usable in all but the tightest micro-controller environments,
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The focus is on the tiny-to-small, deeply embedded environment.
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</p>
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<li><b>Rich Feature OS Set</b></li>
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<p>
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The goal is to provide most standard POSIX OS interfaces to support
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a rich multi-threaded development environment.
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</p>
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NON-GOALS: (1) It is not a goal to provide OS subsystems such
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as network or USB (but these could obviously be added).
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(2) There is no MMU-based support for processes.
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At present, NuttX assumes a flat address space.
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</p>
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<li><b>Highly Scalable</b></li>
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<p>
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Fully scalable from tiny (8-bit) to moderate embedded (32-bit).
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Scalability with rich feature set is accomplished with:
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Many tiny source files, link from static libraries, highly configurable, use of
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weak symbols when available.
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</p>
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<li><b>Standards Compliance</b></li>
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<p>
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NuttX strives to achieve a high degree of standards compliance.
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The primary governing standards are POSIX and ANSI standards.
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Additional standard APIs from Unix and other common RTOS's are
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adopted for functionality not available under these standards
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or for functionaly that is not appropriate for the deeply-embedded
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RTOS (such as <code>fork()</code>).
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</p>
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<p>
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Because of this standards conformance, software developed under other
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standard OSs (such as Linux) should port easily to NuttX.
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</p>
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<li><b>Real-Time</b></li>
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<p>
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Fully pre-emptible, fixed priority and round-robin scheduling.
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</p>
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<li><b>Totally Open</b></li>
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<p>
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Non-restrictive BSD license.
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</p>
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</ol>
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<h1>Downloads</h1>
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<p>
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The initial release of NuttX (nuttx-0.1.0) is avalable for download
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from the <a href="http://sourceforge.net/project/showfiles.php?group_id=189573">SourceForge</a>
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website.
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</p>
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<h1>Supported Platforms</h1>
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<ul>
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<li><b>x86 Linux Simulation</b>. Fully functional.</li>
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<li>TI <b>TMS320C5471</b> (also called <b>TMS320DM180</b>).
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NuttX operates on the ARM7 of this dual core processor.
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This port uses the <a href="http://www.spectrumdigital.com/">Spectrum Digital</a>
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evaluation board with a GNU arm-elf toolchain*.
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This port is complete, verified, and included in the initial NuttX
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release.</li>
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<li><b>8051 Microcontroller</b>.
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This port uses the <a href="http://www.pjrc.com/">PJRC</a> 87C52 development system
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and the <a href="http://sdcc.sourceforge.net/">SDCC</a> toolchain.
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This port will require a few more weeks before it is ready for prime time.</li>
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<li><b>Other ports</b>.
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I also have partial ports for the TI TMS320DM270 and for MIPS.
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<li><b>Linux User Mode</b></li>
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<p>
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A user-mode port of NuttX to the x86 Linux platform is available.
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The purpose of this port is primarily to support OS feature developement.
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</p>
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<p>
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STATUS: Does not support interrupts but is otherwise fully functional.
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</p>
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<li><b>TI TMS320C5471</b> (also called <b>TMS320DM180</b>).</li>
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<p>
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NuttX operates on the ARM7 of this dual core processor.
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This port uses the <a href="http://www.spectrumdigital.com/">Spectrum Digital</a>
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evaluation board with a GNU arm-elf toolchain*.
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</p>
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<p>
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STATUS: This port is complete, verified, and included in the initial NuttX
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release.
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</p>
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<li><b>8051 Microcontroller</b></li>
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<p>
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This port uses the <a href="http://www.pjrc.com/">PJRC</a> 87C52 development system
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and the <a href="http://sdcc.sourceforge.net/">SDCC</a> toolchain.
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</p>
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<p>
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STATUS: This port will require a few more weeks before it is ready for prime time.
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</p>
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<li><b>Other ports</b></li>
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<p>
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There are partial ports for the TI TMS320DM270 and for MIPS.
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</p>
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</ul>
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<blockquote>* A highly modified <a href="http://buildroot.uclibc.org/">buildroot</a>
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@ -61,7 +126,7 @@ is available that be used to build a NuttX-compatible arm-elf toolchain.</blockq
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<p>NuttX is available under the highly permissive
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<a href="http://en.wikipedia.org/wiki/BSD_license">BSD license</a>.
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Other than some fine print that you agree to respect my copyright
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Other than some fine print that you agree to respect the copyright
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you should feel absolutely free to use NuttX in any environment and
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without any concern for jeopardizing any proprietary software that
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you may link with it.</p>
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