[Yaffs] RAM usage

[Evgeny Belyanco]

Wednesday, September 7, 2005, 2:40:25 AM, you wrote:

>> How I can calculate RAM usage for YAFFS (or YAFFS2) direct mode?

CM> Most of the RAM used by YAFFS is in the tnode structures used to build the 
CM> file trees. This uses approx 2 bytes of RAM per "chunk" of NAND.

CM> Most people will use a NAND page as a "chunk", but you can use larger.

CM> That means that if you are using NAND with 512byte pages, then for every 
CM> 1Mbyte of NAND you will need (1MB/512b = 2k chunks) * 2 bytes per chunk = 
CM> 4kbytes of RAM. 

CM> For 2k page chunks you will need only 1 quarter of that.

Thanks!

>> I will try to port YAFFS to uCOS-II.

CM> Please be aware of licensing issues when using YAFFS with non-GPL code.

Of course. I will keep all code, concerning YAFFS, GPL and in separate
*.so.

Evgeny.