Hi yaffsers
Been offline for a while....
I expect to shortly be CVSing the following:
* Some bug fixes to the YAFFS guts.
* Support for pipes and devices (now YAFFS can be used as a root fs).
* Utility to make a yaffs loadable image from a host directory.
In the last few weeks I have been head down, bum up doing an exploratory
WinCE port of YAFFS. The results will be GPLed. The WinCE port wraps up the
yaffs guts in a WindowsCE FSD (File system Device) allowing usage as a normal
file system by WinCE applicaitons. The device even boots off an image held on
the YAFFS fs.
The benefits of this are that more people are now using YAFFS and it is being
tested on more flavours of hardware etc by more people. It also helps
partition problems into VFS (ie. Linux interfacing) vs YAFFS guts.
We have tested this on real hardware (StongARM-based) with NAND arrays in
various sizes from 32MB up to 256MB so far and bigger sizes to follow. This
has flushed out a few minor (but important) bugs. Robustness has been
excellent and I have not had any corruptions in three weeks of
development-style abuse.
Performance is excellent when compared to a commercial (FAT-based)
NAND solutions out there - by a factor of 1.5 to about 200 depending on the
operation mix. As a sampler:
* Flat-out write speed (1MB writes). 1.2MB/s.
* YAFFS-to-YAFFS copy using the WinCE file explorer. The data is read off
YAFFS and written to a new file on YAFFS in 64kB chunks. 500kB/s.
* Copy 11MB file from host over USB ActiveSync. Approx 26 seconds - most of
which is USB transfer time.
* Delete an 11MB file. 5 seconds.
-- Charles
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