[Yaffs-archive] [YAFFS]Check in

[Charles Manning]

Hi yaffsers

I have just checked in some changes to the yaffs cvs. 

Most noteable changes:

* Change to the way deleted chunks are marked. Instead of stomping the tags, 
I changed to using the pageStatus OOB field. This was done to conform to the 
requirement that we don't ever write over a previously written byte ( a new 
requirement coming out with the 256MB NAND chips). NB: This change means you 
will need to reformat previously formatted YAFFS partitions.

* Added hard links.
* Added symlinks.
* Added memory mapping for read. This means that you can now execute a file 
stored in yaffs.

-- Charles


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