Add /etc via ROMFS and /tmp via FAT FS to NSH
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@911 42af7a65-404d-4744-a932-0658087f49c3
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@ -67,6 +67,12 @@
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<a href="#environvars">1.6 Environment Variables</a>
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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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<a href="#startupscript">1.7 NSH Start-Up Script</a>
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</td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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@ -470,6 +476,129 @@ fi
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</tr>
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</table></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="startupscript"><h2>1.7 NSH Start-Up Scrip</h2></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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<b>NSH Start-Up Script</b>.
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NSH supports options to provide a start up script for NSH. In general
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this capability is enabled with <code>CONFIG_EXAMPLES_NSH_ROMFSETC</code>, but has
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several other related configuration options as described with the
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<a href="#nshconfiguration">NSH-specific configuration settings</a>.
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This capability also depends on:
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<ul>
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<li><code>CONFIG_DISABLE_MOUNTPOINT</code> not set
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<li><code>CONFIG_NFILE_DESCRIPTORS</code> < 4
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<li><code>CONFIG_FS_ROMFS</code> enabled
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</ul>
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</p>
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<p>
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<b>Default Start-Up Behavior</b>.
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The implementation that is provided is intended to provide great flexibility
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for the use of Start-Up files. This paragraph will discuss the general
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behavior when all of the configuration options are set to the default
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values.
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</p>
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<p>
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In this default case, enabling <code>CONFIG_EXAMPLES_NSH_ROMFSETC</code> will cause
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NSH to behave as follows at NSH startup time:
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<ul>
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<li>
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NSH will create a read-only RAM disk (a ROM disk), containing a tiny
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ROMFS filesystem containing the following:
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<ul><pre>
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`--init.d/
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`-- rcS
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</pre></ul>
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Where rcS is the NSH start-up script.
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</li>
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<li>
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NSH will then mount the ROMFS filesystem at <code>/etc</code>, resulting in:
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<ul><pre>
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|--dev/
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| `-- ram0
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`--etc/
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`--init.d/
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`-- rcS
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</pre></ul>
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</li>
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<li>
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By default, the contents of rcS script are:
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<ul><pre>
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# Create a RAMDISK and mount it at XXXRDMOUNTPOUNTXXX
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mkrd -m 1 -s 512 1024
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mkfatfs /dev/ram1
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mount -t vfat /dev/ram1 /tmp
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</pre></ul>
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</li>
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<li>
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NSH will execute the script at <code>/etc/init.d/rcS</code> at start-up (before the
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first NSH prompt. After execution of the script, the root FS will look
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like:
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<ul><pre>
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|--dev/
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| |-- ram0
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| `-- ram1
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|--etc/
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| `--init.d/
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| `-- rcS
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`--tmp/
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</pre></ul>
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</li>
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</ul>
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</p>
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<p>
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<b>Modifying the ROMFS Image</b>.
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The contents of the <code>/etc</code> directory are retained in the file
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<code>examples/nsh/nsh_romfsimg.h</code>. In order to modify the start-up
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behavior, there are three things to study:
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<ol>
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<li>
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<b>Configuration Options.</b>
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The additional <code>CONFIG_EXAMPLES_NSH_ROMFSETC</code> configuration options
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discussed with the other <a href="#nshconfiguration">NSH-specific configuration settings</a>.
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</li>
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<li>
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<p>
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<b><code>mkromfsimg.sh</code> Script</b>.
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The script <code>examples/nsh/mkromfsimg.sh</code> creates <code>nsh_romfsimg.h</code>.
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It is not automatically executed. If you want to change the
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configuration settings associated with creating and mounting
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the <code>/tmp</code> directory, then it will be necessary to re-generate
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this header file using the <code>mkromfsimg.sh</code> script.
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</p>
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<p>
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The behavior of this script depends upon three things:
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<ul>
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<li>The configuration settings then installed configuration.
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<li>The <code>genromfs<code> tool (available from <a href="http://romfs.sourceforge.net">http://romfs.sourceforge.net</a>).
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<li>The file <code>examples/nsh/rcS.template</code>.
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</ul>
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</p>
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</li>
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<li>
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<b><code>rcS.template</code></b>.
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The file <code>examples/nsh/rcS.template</code> contains the general form
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of the <code>rcS</code> file; configurated values are plugged into this
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template file to produce the final <code>rcS</code> file.
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</li>
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</ol>
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</p>
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<p>
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All of the startup-behavior is contained in <code>rcS.template</code>. The
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role of <code>mkromfsimg.sh</code> is to (1) apply the specific configuration
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settings to <code>rcS.template</code> to create the final <code>rcS</code>, and (2) to
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generate the header file <code>nsh_romfsimg.h</code> containg the ROMFS
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file system image.
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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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@ -1641,7 +1770,7 @@ nsh>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_FILEIOSIZE</code></b></td>
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<td>
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Size of a static I/O buffer used for file access (ignored if
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there is no filesystem).
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there is no filesystem). Default is 1024.
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</td>
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</tr>
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<tr>
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@ -1691,6 +1820,15 @@ nsh>
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where a minimal footprint is a necessity and background command execution is not.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_ROMFSETC</code></b></td>
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<td>
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Mount a ROMFS filesystem at <code>/etc</code> and provide a startup script
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at <code>/etc/init.d/rcS</code>. The default startup script will mount
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a FAT FS RAMDISK at <code>/tmp</code> but the logic is
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<a href="#startupscript">easily extensible</a>.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_CONSOLE</code></b></td>
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<td>
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@ -1720,6 +1858,7 @@ nsh>
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<th align="left" width="25%">Configuration</th>
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<th align="left">Description</th>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_IOBUFFER_SIZE</code></b></td>
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<td>
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Determines the size of the I/O buffer to use for sending/
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@ -1760,6 +1899,76 @@ nsh>
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</tr>
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</table></center>
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<p>
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If <code>CONFIG_EXAMPLES_NSH_ROMFSETC</code> is selected, then the following additional
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configuration setting apply:
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</p>
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<center><table width="100%">
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<tr bgcolor="#e4e4e4">
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<th align="left" width="25%">Configuration</th>
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<th align="left">Description</th>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_ROMFSMOUNTPT</code></b></td>
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<td>
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The default mountpoint for the ROMFS volume is <code>"/etc"</code>, but that
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can be changed with this setting. This must be a absolute path
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beginning with '<code>/</code>' and enclosed in quotes.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_INITSCRIPT</code></b></td>
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<td>
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This is the relative path to the startup script within the mountpoint.
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The default is <code>"init.d/rcS"</code>. This is a relative path and must not
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start with '<code>/</code>' but must be enclosed in quotes.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_ROMFSDEVNO</code></b></td>
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<td>
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This is the minor number of the ROMFS block device. The default is
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'<code>0</code>' corresponding to <code>/dev/ram0</code>.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_ROMFSSECTSIZE</code></b></td>
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<td>
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This is the sector size to use with the ROMFS volume. Since the
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default volume is very small, this defaults to 64 but should be
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increased if the ROMFS volume were to be become large. Any value
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selected must be a power of 2.
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</td>
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</tr>
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</table></center>
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<p>
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When the default <code>rcS</code> file used when <code>CONFIG_EXAMPLES_NSH_ROMFSETC</code> is
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selected, it will mount a FAT FS under <code>/tmp</code>. The following selections
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describe that FAT FS.
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</p>
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<center><table width="100%">
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<tr bgcolor="#e4e4e4">
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<th align="left" width="25%">Configuration</th>
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<th align="left">Description</th>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_FATDEVNO</code></b></td>
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<td>
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This is the minor number of the FAT FS block device. The default is
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'<code>1</code>' corresponding to <code>/dev/ram1</code>.
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</td>
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</tr>
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<tr>
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<td valign="top"><b><code>CONFIG_EXAMPLES_NSH_FATSECTSIZE</code></b></td>
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<td>
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This is the sector size use with the FAT FS. Default is 512.
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</td>
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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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@ -1785,13 +1994,22 @@ nsh>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_DISABLEBG</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_DISABLESCRIPT</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_DRIPADDR</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_FATDEVNO</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_FATMOUNTPT</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_FATNSECTORS</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_FATSECTSIZE</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_FILEIOSIZE</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_INITSCRIPT</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_IOBUFFER_SIZE</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_IPADDR</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_LINELEN</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_NESTDEPTH</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_NETMASK</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_NOMAC</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_ROMFSDEVNO</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_ROMFSETC</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_ROMFSMOUNTPT</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_ROMFSSECTSIZE</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_STACKSIZE</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_STRERROR</code></a></li>
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<li><a href="#nshconfiguration"><code>CONFIG_EXAMPLES_NSH_TELNET</code></a></li>
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@ -1802,11 +2020,12 @@ nsh>
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<li><a href="#currentwd">Current working directory</a></li>
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<li><a href="#cmdecho"><code>echo</code></a></li>
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<li><a href="#environvars">Environment Variables</a></li>
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<li><a href="#startupscript"><code>/etc/init.d/rcS</code></a>
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</ul></td>
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<td></ul>
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<li><a href="#cmdexec"><code>exec</code></a></li>
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<li><a href="#cmdexit"><code>exit</code></a></li>
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<li><a href="#cmdget"><code>get</code></a></li>
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</ul></td>
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<td></ul>
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<li><a href="#frontend">Greeting</a></li>
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<li><a href="#cmdhelp"><code>help</code></a></li>
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<li><a href="#conditional"><code>if-then[-else]-fi</code></a></li>
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@ -1837,6 +2056,7 @@ nsh>
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<li><a href="#cmdsh"><code>sh</code></a></li>
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<li><a href="#cmdoverview">Simple commands</a></li>
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<li><a href="#cmdsleep"><code>sleep</code></a></li>
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<li><a href="#startupscript">start-up script</a>
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<li><a href="#cmdtest"><code>test</code></a></li>
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<li><a href="#cmdunmount"><code>umount</code></a></li>
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<li><a href="#cmdunset"><code>unset</code></a></li>
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@ -8,7 +8,7 @@
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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: September 10, 2008</p>
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<p>Last Updated: September 11, 2008</p>
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</td>
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</tr>
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</table>
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@ -1099,6 +1099,7 @@ buildroot-0.1.0 2007-03-09 <spudmonkey@racsa.co.cr>
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nuttx-0.3.15 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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* Added support for ROMFS filesystem.
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* Added a simple test the ROMFS filesystem (examples/romfs)
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* NSH: Use ROMFS to provide an option for a start-up script at /etc/init.d/rcS
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pascal-0.1.3 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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