<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Chapter 6. Filesystem support</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="MTD NAND Driver Programming Interface" /><link rel="up" href="index.html" title="MTD NAND Driver Programming Interface" /><link rel="prev" href="ch05s05.html" title="Spare area autoplacement default schemes" /><link rel="next" href="ch07.html" title="Chapter 7. Tools" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 6. Filesystem support</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch05s05.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch07.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 6. Filesystem support"><div class="titlepage"><div><div><h2 class="title"><a id="filesystems"></a>Chapter 6. Filesystem support</h2></div></div></div><p> The NAND driver provides all neccecary functions for a filesystem via the MTD interface. </p><p> Filesystems must be aware of the NAND pecularities and restrictions. One major restrictions of NAND Flash is, that you cannot write as often as you want to a page. The consecutive writes to a page, before erasing it again, are restricted to 1-3 writes, depending on the manufacturers specifications. This applies similar to the spare area. </p><p> Therefor NAND aware filesystems must either write in page size chunks or hold a writebuffer to collect smaller writes until they sum up to pagesize. Available NAND aware filesystems: JFFS2, YAFFS. </p><p> The spare area usage to store filesystem data is controlled by the spare area placement functionality which is described in one of the earlier chapters. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch05s05.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ch07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Spare area autoplacement default schemes </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 7. Tools</td></tr></table></div></body></html>
