[Yaffs] Read Disturb

Hi, I'm trying to understand the mechanisms built in Yaffs to mitigate read
disturb failures.

In the Summary of YaffsNandFailureMitigation PDF there’s a reference to an
“Occasional rewrite of oldest data” mechanism. How data is evaluated to be
old or not? Is it based on duration since last write? Is it possible to
configure the duration used by this mechanism to evaluate if data is old or
not?

Does YAFFS has a built-in mechanism to re-write data when the NAND status
register Rewrite recommended flag is set?

At the moment there’s no call from MTD to the NAND Controller driver to
read the status register after a reading data. Is there a configuration
that need to be done to activate the reading of the NAND status register
and rewriting of data when the NAND status register report “Rewrite
recommended”?

Thanks,

Dan