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Add a configuration to begin development of an LM4F120 LaunchPad port 

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5692 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2013-03-01 19:10:02 +00:00
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Documentation/NuttX.html
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@ -2017,16 +2017,33 @@ svn checkout -r5595 http://svn.code.sf.net/p/nuttx/code/trunk nuttx-code
As of this writing, more device drivers are needed to make this a more complete port.
</p>
<p>
For a full-featured RTOS such as NuttX, providing support in a usable and meaningful way within the tiny memories of the NUC120 demonstrates the scalability of NuttX (128KB FLASH and 16KB of SRAM in a 48-pin package).
When running the NSH configuration (a full up application), there is still more than 9KB or SRAM available:
<b>Memory Usage</b>.
For a full-featured RTOS such as NuttX, providing support in a usable and meaningful way within the tiny memories of the NUC120 demonstrates the scalability of NuttX. The NUC120LE2AN comes in a 48-pin package and has 128KB FLASH and 16KB of SRAM.
When running the NSH configuration (itself a full up application), there is still more than 90KB of FLASH and 10KB or SRAM available for further application development).
</p>
<p>
Static memory usage can be shown with <code>size</code> command:
</p>
<ul><pre>
$ size nuttx
text data bss dec hex filename
35037 106 1092 36235 8d8b nuttx
</pre></ul>
<p>
NuttX, the NSH application, and GCC libraries use 34.2KB of FLASH leaving 93.8KB of FLASH (72%) free from additional application development.
Static SRAM usage is about 1.2KB (&lt;4%) and leaves 13.8KB (86%) available for heap at runtime.
SRAM usage at run-time can be shown with the NSH <code>free</code> command:
</p>
<ul><pre>
NuttShell (NSH) NuttX-6.26
nsh> free
total used free largest
Mem: 13344 3944 9400 9400
Mem: 14160 3944 10216 10216
nsh>
</ul>
</pre></ul>
<p>
You can see that 10.0KB (62%) is available for further application development.
</p>
<p>
<b>Development Environments:</b>
1) Linux with native Linux GNU toolchain, 2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS