136e3d9fca
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@123 42af7a65-404d-4744-a932-0658087f49c3
457 lines
12 KiB
HTML
457 lines
12 KiB
HTML
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<title>NuttX</title>
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<table width ="100%">
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<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
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<p>Last Updated: March 21, 2007</p>
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<hr><hr>
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<table width ="100%">
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<td>
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<h1>Table of Contents</h1>
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<center><table width ="80%">
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<table>
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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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<td><img src="favicon.ico"></td>
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<td><a href="#downloads">Downloads</a></td>
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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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<td><img src="favicon.ico"></td>
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<td><a href="#footprint">Memory Footprint</a></td>
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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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<td><img src="favicon.ico"></td>
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<td><a href="#history">Release History</a></td>
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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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</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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</tr>
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</table>
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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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<center><table width="90%">
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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><br></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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<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><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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</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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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<b>Highly Scalable</b>
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<td><br></td>
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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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<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><br></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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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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<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><br></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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<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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<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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</tr>
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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="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 fourth release of NuttX (nuttx-0.2.1) 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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<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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<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><br></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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<p>
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<b>STATUS:</b>
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Does not support interrupts but is otherwise fully functional.
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</p>
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</td>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>ARM7TDMI</b>.
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<td><br></td>
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<td>
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<p>
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<b>TI TMS320C5471</b> (also called a <b>C5471</b> or <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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</p>
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<p>
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<b>STATUS:</b>
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This port is complete, verified, and included in the initial NuttX release.
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</p>
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</td>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>ARM9EJS</b>.
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</td>
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<td><br></td>
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<td>
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<p>
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<b>TI TMS320DM320</b> (also called <b>DM320</b>).
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NuttX operates on the ARM9 of this dual core processor.
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This port uses the
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<a href="http://wiki.neurostechnology.com/index.php/Developer_Welcome">Neuros OSD</a>
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with a GNU arm-elf toolchain*.
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</p>
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<p>
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<b>STATUS:</b>
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This port is code complete but totally untested due to hardware issues with my OSD.
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</p>
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</td>
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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><br></td>
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<td>
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<p>
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<b>PJRC 87C52 Development Board</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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</p>
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<p>
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<b>STATUS:</b>
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This port is complete but not stable with timer interrupts enabled.
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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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</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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<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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</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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<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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Linux <tt>size</tt> command is (3/9/07):
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</p>
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<pre>
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text data bss dec hex filename
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53272 428 3568 57268 dfb4 nuttx
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</pre>
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<p><b>87C52</b>
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A reduced functionality OS test for the 8052 target requires only
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about 18-19Kb:
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</p>
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<pre>
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Stack starts at: 0x21 (sp set to 0x20) with 223 bytes available.
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Other memory:
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Name Start End Size Max
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---------------- -------- -------- -------- --------
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PAGED EXT. RAM 0 256
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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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<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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<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.
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</p>
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</ul>
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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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<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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* Support for Linux user mode simulation and TI
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TMS320C5471 (Arm7) provided
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0.1.1 2007-03-14 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Corrected an error in interrupt level context switching
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for C5471
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* Added fgets() and gets() logic; verified c5471 console read.
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* Corrected error in reading from the C5471 serial port:
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Improper use of semaphore can cause deadlock.
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* Fixed an error in the memory cleanup: The idle task
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cannot take sempahores (because it must always be ready
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to run).
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* Tasks can now accept a configurable maximum number of
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input parameters (argc)
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* _task_init() was divided into separate functions that
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require fewer parameters. This was necessary to keep
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the stack usage down for the 8051/2 (which has only
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256 bytes of stack).
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* Attempts to use C5471 console from interrupt handlers
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can cause errors. Added a special path for this case.
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* Refuse calls to sem_wait and sem_trywait from interrupt
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handlers. This was happening because interrupt handlers
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were calling printf-like functions.
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* Added strtok() and strtok_r()
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* Added a simple shell called nsh (see examples/nsh).
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* Platform support for 8052 is complete but not stable
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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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0.1.2 2007-03-19 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Add dirent.h, opendir(), readdir(), closedir(), etc.
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* Add strerror()
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* Added 'ls' command to nsh
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* Added C5471 watchdog driver
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* Fixed another bug where free() is called from IDLE task.
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Can't do this; the caller must be able to wait for access
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to memory.
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* Fixed bugs associated with debug output:
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Cannot do dbg() in middle of context switch logic.
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because it may require use of semaphores and cause
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additional context switches. lldbg() is safe.
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* Interrupt must be disabled throughout all context switches.
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* Separated C5471 serial driver; a shareable part is
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in drivers/. ; the C5471 specific part is in arch/C5471.
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serial.h defines the interface.
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* Fixed mq_receive() and mq_send() -- bad memcpy()
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* Fixed C5471 signal deliver logic: use of dbg() and
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other actions by use signal handler can alter errno.
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need to protect errno during signal handling.
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* Fixed uninitialized variable in filesystem that could
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cause various problems
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* Added a test for roundrobin scheduler.
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0.2.1 2007-03-22 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Fix error in handing signed decimal in vsprintf().
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* Major restructuring of header files to get closer to
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POSIX compliance.
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* Eliminate compilation warnings that that crept into
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recent check-ins
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* Add kill()
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* Added support for POSIX timers
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* Some Documentation updates
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* Added support for the Neuros OSD / DM320
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</pre></ul>
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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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<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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