Please do a cat /proc/mtd and cat /proc/yaffs for both working and non-working 
configurations.

-- CHarles
On Friday 26 February 2010 19:53:34 Saquib wrote:
> Hi All,
>
> Only with 256MB partition size it is not working.
>
> *When you reduce the size do the writes to the fourth partition work or
> only to
> the first three partitions?*
>
> Yes its working fine for all partitions.With MTD Utility I have not tried.
>
> We had combination of 300MB 300MB 300MB and rest is fourth partition (of
> 1GB NAND). It is working fine, read/write on all partitions done
> successfully.
>
> Was this issue is faced by anyone or this is the first time I am getting?
>
> Thanks & regards,
> Saquib
>
> On Fri, Feb 26, 2010 at 3:15 AM, Charles Manning 
<manningc2@actrix.gen.nz>wrote:
> > On Friday 26 February 2010 01:39:44 Saquib wrote:
> > > Hi All,
> > >
> > > Thanks for your continued support and cooperation.
> > >
> > > On Numonyx nand flash of 1GB we are trying to create four partitions of
> > > 256MB each.
> > >
> > > The problem is when ever we are trying to create the file in any of the
> > > partition, it is not writing file(s) into NAND flash.
> > >
> > > When we do unmount and re-mount on the same partitions, not able to see
> >
> > the
> >
> > > files.
> > >
> > > *Obervation:
> > > *
> > > When size of the partitions is reduced to 128MB as below, file(s)
> > > storage on NAND flash is happening successfully.
> > >
> > > First Partition = 128MB
> > >
> > > Second Partition = 128MB
> > >
> > > Third Partition = 128MB
> > >
> > > Fourth Partition = remaining left free space (of 1GB).
> > >
> > > Please help me to resolve issue.
> >
> > When you reduce the size do the writes to the fourth partition work or
> > only to
> > the first three partitions?
> >
> > If you read/write with the mtd tools what happens?