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authorpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2011-05-08 14:42:42 +0000
committerpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2011-05-08 14:42:42 +0000
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parent0a30a23cf0bb5a2abf1f02c5f120641e75067fae (diff)
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Complets ram mapping logic
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3578 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/Documentation/NuttXNxFlat.html')
-rw-r--r--nuttx/Documentation/NuttXNxFlat.html10
1 files changed, 6 insertions, 4 deletions
diff --git a/nuttx/Documentation/NuttXNxFlat.html b/nuttx/Documentation/NuttXNxFlat.html
index b08b65801..d6ada4e9b 100644
--- a/nuttx/Documentation/NuttXNxFlat.html
+++ b/nuttx/Documentation/NuttXNxFlat.html
@@ -10,7 +10,7 @@
<td>
<h1><big><font color="#3c34ec"><i>NXFLAT</i></font></big></h1>
<h2><font color="#dc143c">&gt;&gt;&gt; Under Construction &lt;&lt;&lt;</font></h2>
- <p>Last Updated: March 20, 2011</p>
+ <p>Last Updated: May 8, 2011</p>
</td>
</tr>
</table>
@@ -193,10 +193,12 @@
<a name="limitations"><h2>1.3 Limitations</h2></a>
<ul>
- <li><b>ROMFS Only</b>.
- The initial NXFLAT release will work only with executable modules residing on a ROMFS
- file system.
+ <li><b>ROMFS (or RAM maps) Only</b>.
+ The initial NXFLAT release will work only with wither (1) executable modules residing on a ROMFS
+ file system, or (2) executables provided on other file systems provided that <code>CONFIG_FS_RAMMAP</code>
+ is defined.
That is because the loader depends on the capability to <code>mmap()</code> the code segment.
+ See the <a href="NuttxUserGuide.html#mmapxip">NuttX User Guide</a> for further information.
NUTTX does not provide any general kind of file mapping capability.
In fact, <i>true </i>file mapping is only possible with RTOSs and MCUs that provide an MMU<sup>1</sup>
and only ROMFS supports that kind of XIP execution from FLASH.