w.r.t my previous posting (YAFFS on
NOR in Linux)...
I found that problem is due to Gross
locking of FS in YAFFS. While erasing, i was not able to run any applications
from YAFFS.
Since MTD layer for NOR implements locking
per operation & our YAFFS FS is read-only most of the time,
I tried to unlock YAFFS gross
lock just before call to mtd->erase and locking it back again after
return from MTD call.
This solved my problem of filesystem
getting locked during flash erase. i.e now i m able to run applications
while flash erase is ON (ex delete of a 1MB file).
I know this is not a neat solution but
owing to the point FS in our case is read-only unless during firmware
upgrade,
do you think we can live with this work-around?
or is the implementation of grain
locking only solution for having YAFFS on NOR?
Any help/direction is greatly appreciated.
Charles Manning <manningc2@actrix.gen.nz> Sent by: yaffs-bounces@lists.aleph1.co.uk
12/02/2009 02:52 AM
To
yaffs@lists.aleph1.co.uk
cc
Srilatha.Narayana@lntemsys.com
Subject
Re: [Yaffs] YAFFS2 on NOR Flash - CPU
overloading during erase/write
On Tuesday 01 December 2009 19:15:01 Srilatha.Narayana@lntemsys.com
wrote:
> Hello,
>
> I am using YAFFS2 on Intel Strata Flash P30 for a MPC8313 based board
> (linux 2.6.29).
> I have modified YAFFS2 for NOR as in
> http://www.yaffs.net/yaffs-direct-user-guide.
>
> I am encountering this problem with YAFFS2 now -
> Any write to filesystem has been causing elevated priority threads
to
> block (especially during erase).
>
> Any hint or pointers would be greatly appreciated.
>
I am not aware of anyone using YAFFS on NOR in Linux. You will likely need
to
fiddle around with the mtd interfacing to make this work well.
-- Charles
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