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<h2>Search results</h2><ol><li>
<h3>
  <a href="https://yaffs.net/archives/yaffs-original-specification">Yaffs Original Specification</a>
</h3>

  <p>…  a file id and chunk number. These tags are stored in the &quot;<strong>spare</strong> data&quot; region of the flash. The chunk number is …  require just one pass reading NAND. Since only the the <strong>spare</strong> data needs to be read, this should be relatively fast …  As always, life is a compromise....  

    
   

  <strong>Spare</strong> area details  

  The following table summarizes the …</p>
  <p></p>
</li><li>
<h3>
  <a href="https://yaffs.net/documents/yaffs-direct-interface">Yaffs Direct Interface</a>
</h3>

  <p>…  (that is, a 512-byte or larger data portion and a 16-byte <strong>spare</strong> area). For Yaffs2, a chunk will typically be larger …  be a single 2k page: 2kbytes of data and 64 bytes of <strong>spare</strong>). Yaffs2 is capable of working with smaller chunk …  are page chunk aligned. Some reads might only read the <strong>spare</strong> area where the tags are kept.  
   
  
  When …</p>
  <p><span lang="" about="/user/admin" typeof="schema:Person" property="schema:name" datatype="">Admin</span> - 7 Jun 2017 - 11:53pm</p>
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<h3>
  <a href="https://yaffs.net/documents/yaffs-tuning">Yaffs Tuning</a>
</h3>

  <p>…  be used to store data and the tags will be stored in the <strong>spare</strong> area. If inbandTags is set then part of this area will …   
			  
			  
			  The number of available bytes in the <strong>spare</strong> area of the flash page. This excludes space used by …</p>
  <p><span lang="" about="/user/admin" typeof="schema:Person" property="schema:name" datatype="">Admin</span> - 27 Jun 2017 - 3:37am</p>
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<h3>
  <a href="https://yaffs.net/archives/yaffs-development-notes">Yaffs (Yaffs1) Development Notes</a>
</h3>

  <p>…  the same size as a NAND flash page (ie. 512 bytes + 16 byte <strong>spare</strong>). In the future we might decide to allow for different …   
   
  
  A chunk of file data.  
   
  
  The 16 byte <strong>spare</strong> area contains:  
  
  
  8 bytes of tags,  
   
  
  6 …  *dev,int chunkInNAND, const __u8 *data, yaffs_<strong>Spare</strong> *<strong>spare</strong>)  
   
  
  int ReadChunkFromNAND(struct …</p>
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<h3>
  <a href="https://yaffs.net/documents/how-yaffs-works">How Yaffs works</a>
</h3>

  <p>…  Yaffs1 only ever overwrites a single byte in the <strong>spare</strong> area of the chunks to set the deletion marker. More …  block marking. This checks the sixth byte (byte 5) of the <strong>spare</strong> area. In a good block this should be 0xFF. A …  mode is designed to support a wider range of devices and <strong>spare</strong>-area layouts. Thus, Yaffs2 does not decide which bytes …</p>
  <p><span lang="" about="/user/charles-manning" typeof="schema:Person" property="schema:name" datatype="">Charles Manning</span> - 27 Jun 2017 - 3:33am</p>
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<h3>
  <a href="https://yaffs.net/yaffs-2-specification">Yaffs 2 Specification</a>
</h3>

  <p>…  faster operation. (Yaffs1 uses a single rewrite in the <strong>spare</strong> area to delete a page).  
   
  
  Ability to exploit …       42 bytes    
     
   
  
  
    
   
  To get enough <strong>spare</strong> bytes for this tagging structure requires a chunk-size …</p>
  <p></p>
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<h3>
  <a href="https://yaffs.net/yaffs-porting-guide">Yaffs Porting Guide</a>
</h3>

  <p>…       int spareBytesPerChunk      
This is the size of the <strong>spare</strong> area, i.e. the number of OOB bytes per chunk (page)  . …  enough space for the data yaffs would normally store in the <strong>spare</strong> area.  

      write/readChunkWithTagsFromNAND, …  is the OOB data you will want to write out to the nands <strong>spare</strong> area.  

  How you write these out to the OOB data …</p>
  <p></p>
</li><li>
<h3>
  <a href="https://yaffs.net/archives/yaffs-nand-specific-flash-file-system-introductory-article">YAFFS: the NAND-specific flash file system - Introductory Article</a>
</h3>

  <p>…   Access  
   
   
   Random  
   
   
   Page oriented with <strong>spare</strong> area on each page. Sequential access within a page.  
 …</p>
  <p></p>
</li><li>
<h3>
  <a href="https://yaffs.net/archive/jffs2-and-nand-study">JFFS2 and NAND study</a>
</h3>

  <p>…  out a chunk of code too.  
   
  
  Attempting to use the <strong>spare</strong> 16 bytes per page for journalling tags (if there&#039;s a …</p>
  <p></p>
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