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Demand paging documentation

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2854 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
2010-08-15 15:13:34 +00:00
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Documentation/NuttXDemandPaging.html
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<a name="Overview"><h2>Overview</h2></a>
<p>
This document summarizes the design of NuttX on-demand page.
This document summarizes the design of NuttX on-demand paging.
This feature permits embedded MCUs with some limited RAM space to execute large programs some some non-random access media.
This feature was first discussed in this email thread:
<a href="http://tech.groups.yahoo.com/group/nuttx/message/213">http://tech.groups.yahoo.com/group/nuttx/message/213</a>.
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</li>
<li>
The MCU must have a (relatively) small block of fast SRAM from which it can execute code.
A size of, say 256Kb (or 192Kb as in the ea3131) would be sufficient for many applications.
A size of, say 256Kb (or 192Kb as in the NXP LPC3131) would be sufficient for many applications.
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<li>
The MCU has an MMU (again like the ea3131).
The MCU has an MMU (again like the NXP LPC3131).
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</p>
<p>
If the platforms meets these requirement, then NuttX can provide on-demand paging:
If the platform meets these requirement, then NuttX can provide on-demand paging:
It can copy .text from the large program in non-volatile media into RAM as needed to execute the huge program from the small RAM.
</p>