> I intend to use YAFFS to a SD Card
> file system.
If you are planning to use an SD Card as a storage medium, you don't need yaffs. Using yaffs on an SD Card medium does not give you any benefits. If anything, it will wear out your SD Card faster.
yaffs is a file system designed to run on top of raw flash. An SD Card is not raw flash. It contains a raw flash chip, true, but it also contains a microcontroller with firmware which will make the raw flash look like a standard disk (block device). This firmware is called a 'flash translation layer'.
In short, if you want to use an SD Card as a storage medium, use a standard disk (block device) file system such as FAT.
Sven
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