Documentation update
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@64 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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<title>NuttX</title>
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</head>
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<body background="backgd.gif">
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<center>
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<hr><hr>
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<h1><big><i>NuttX RTOS</i></big></h1>
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<hr><hr>
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<table width ="100%">
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<tr align="center" bgcolor="#e4e4e4">
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<td>
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<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
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<p>Last Updated: March 14, 2007</p>
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<hr><hr>
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</td>
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</tr>
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</table>
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<hr><hr>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<h1>Table of Contents</h1>
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</center>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#downloads">Downloads</a></li>
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<li><a href="#platforms">Supported Platforms</a></li>
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<li><a href="#footprint">Memory Footprint</a></li>
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<li><a href="#licensing">Licensing</a></li>
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<li><a href="#history">Release History</a></li>
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<li><a href="#documentation">Other Documentation</a></li>
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</td>
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</tr>
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</table>
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<center><table width ="80%">
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<tr>
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<td>
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<table>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#overview">Overview</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#downloads">Downloads</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#platforms">Supported Platforms</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#footprint">Memory Footprint</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#licensing">Licensing</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#history">Release History</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#documentation">Other Documentation</a></td>
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</tr>
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</table>
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</td>
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</td>
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</table></center>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="overview"><h1>Overview</h1></a>
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</td>
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</tr>
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</table>
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<a name="overview"><h1>Overview</h1></a>
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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><b>Small Footprint</b></li>
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<center><table width="90%">
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Small Footprint</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Rich Feature OS Set</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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@ -40,14 +104,32 @@
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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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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Highly Scalable</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Standards Compliance</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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@ -60,28 +142,67 @@
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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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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Real-Time</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Totally Open</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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</tr>
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</table></center>
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<a name="downloads"><h1>Downloads</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="downloads"><h1>Downloads</h1></a>
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</td>
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</tr>
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</table>
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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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The second release of NuttX (nuttx-0.1.1) 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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<a name="platforms"><h1>Supported Platforms</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="platforms"><h1>Supported Platforms</h1></a>
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</td>
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</tr>
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</table>
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<ul>
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<li><b>Linux User Mode</b></li>
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<center><table width="90%">
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Linux User Mode</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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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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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>TI TMS320C5471</b> (also called <b>TMS320DM180</b>).
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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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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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>8052 Microcontroller</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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There seems to be some issue when the stack pointer enters into the indirect IRAM
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address space during interrupt handling.
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</p>
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<li><b>Other ports</b></li>
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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Other ports</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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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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</td>
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</tr>
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</table></center>
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<blockquote>* A highly modified <a href="http://buildroot.uclibc.org/">buildroot</a>
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is available that be used to build a NuttX-compatible arm-elf toolchain.</blockquote>
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<a name="footprint"><h1>Memory Footprint</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="footprint"><h1>Memory Footprint</h1></a>
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</td>
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</tr>
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</table>
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<ul>
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<p><b>C5471 (Arm7)</b>
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The build for this ARM7 target that includes most of the OS features and
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a broad range of OS tests. The size of this executable as given by the
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@ -143,19 +303,36 @@ Other memory:
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EXTERNAL RAM 0x0100 0x02fd 510 7936
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ROM/EPROM/FLASH 0x2100 0x6e55 19798 24384
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</pre>
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</ul>
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<a name="licensing"><h1>Licensing</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="licensing"><h1>Licensing</h1></a>
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</td>
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</tr>
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</table>
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<p>NuttX is available under the highly permissive
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<ul>
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<p>
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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 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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you may link with it.
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</p>
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</ul>
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<a name="history"><h1>Release History</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="history"><h1>Release History</h1></a>
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</td>
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</tr>
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</table>
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<pre>
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<ul><pre>
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0.1.0 2007-03-09 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Initial Release
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@ -189,12 +366,26 @@ Other memory:
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when the timer interrupt is enabled. Seems to be an
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issue when SP enters indirect address space.
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* Documentation updates
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</pre>
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</pre></ul>
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<a name="documentation"><h1>Other Documentation</h1></a>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="documentation"><h1>Other Documentation</h1></a>
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</td>
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</tr>
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</table>
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<li><a href="NuttxUserGuide.html">User Guide</li>
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<li><a href="NuttxPortingGuide.html">Porting Guide</li>
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<ul><table>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="NuttxUserGuide.html">User Guide</td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="NuttxPortingGuide.html">Porting Guide</td>
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</tr>
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</center></ul>
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</body>
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</html>
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</a>
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</td>
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<td>
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<big><b>NuttX RTOS</b></big><br>
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<table width="100%">
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<tr>
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<td bgcolor="#e4e4e4">
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<big><b><i><font color="#3c34ec">NuttX RTOS</font></i></b></big>
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</td>
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</tr>
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<tr>
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<td>
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<a href="http://sourceforge.net/projects/nuttx" target="_top">Project</a><br>
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</td>
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</tr>
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<tr>
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<td>
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<a href="http://nuttx.sourceforge.net" target="_top">Home</a>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</body>
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</html>
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<head>
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<title>NuttX</title>
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</head>
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<frameset rows="75,*" framespacing="0" border="0" frameborder="0">
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<frameset rows="80,*" framespacing="0" border="0" frameborder="0">
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<frame name="header" scrolling="no" target="main" src="NuttXBanner.html" marginwidth="0" marginheight="0">
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<frame name="main" src="NuttX.html">
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<noframes>
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