Try turning on all tracing, including tracing in the mtd.

Also:
1) What does 'cat /rpoc/mtd' show?
2) What does dmesg show when you do the mount?
3) Did you erase the flash?

If you are getting a 'no more erased blocks' message then that means all the
blocks were either full or bad. Try to erase the flash and see if that fixes
things. If not, then there is alikely a problem in the bad block handling or
spare area handling in your mtd.

-- Charles

On Thursday 21 January 2010 03:32:47 Saquib wrote:
> Hi,
>
> Thanks for your continued support and cooperation.
>
> On MTD partition size of 2MB, I am trying to mount the YAFFS2.
>
> Steps are as follows:
>
> (1) First I have written the low level driver to access NAND flash.
> (2) Hook-up all the low level functions to fill MTD structures.
> (3) Then I'd given the command to create block device
>  #mknod -m 777 /dev/mtdblock0 b 31 0
> (4) #mkdir /mnt
> (5) #mount -t yaffs2 /dev/mtdblock0 /mnt
> (6) In /mnt folder i can see lost+found
> (7) While trying to create directory or file could see the following error
> "*yaffs tragedy: no more eraased blocks*"
>
> On doing the # cat /proc/yaffs can see the below results, *nErasedBlocks
> *is zero.
> startBlock......... 0
> endBlock........... 15
> chunkGroupBits..... 0
> chunkGroupSize..... 1
> nErasedBlocks...... 0
> nTnodesCreated..... 100
> nFreeTnodes........ 100
> nObjectsCreated.... 200
> nFreeObjects....... 96
> nFreeChunks........ 0
> nPageWrites........ 0
> nPageReads......... 0
> nBlockErasures..... 0
> nGCCopies.......... 0
> garbageCollections. 0
> passiveGCs......... 0
> nRetriedWrites..... 0
> nRetireBlocks...... 0
> eccFixed........... 0
> eccUnfixed......... 0
> tagsEccFixed....... 0
> tagsEccUnfixed..... 0
> cacheHits.......... 0
> nDeletedFiles...... 0
> nUnlinkedFiles..... 2
> nBackgroudDeletions 0
> useNANDECC......... 1
> isYaffs2........... 1
>
> Please let me know, is this the problem with low level driver or I am
> missing something else.
>
> Thanks in advance.
>
> Regards,
> Saquib Herman
>
> On Mon, Jan 18, 2010 at 10:39 PM, Charles Manning
>
> <manningc2@actrix.gen.nz>wrote:
> > You still have not explained what steps you took.
> >
> > You don't need to fdisk or anything like that. Just erase the flash
> > first.
> >
> > It is also important to turn on all the tracing you can when you start
> > out. Read:http://www.yaffs.net/yaffs-debugging
> >
> > echo 0xffffffff > /proc/yaffs
> >
> > Also read
> > http://www.aleph1.co.uk/lurker/message/20090826.015413.14594671.en.htmlfo
> >r a general approach.
> >
> > On Tuesday 19 January 2010 01:53:48 Saquib wrote:
> > > Hi All,
> > >
> > > Thanks for continued support and cooperation.
> > >
> > > We have created partition on NAND flash and able to mount one of the
> > > directory to that partition.
> > >
> > > Issue is when we are trying to create a directory/file on mounted
> > > folder, getting the following errors.
> > >
> > > *"yaffs tragedy: no more erased blocks"*
> > > *mkdir: can not create a directory 'temp' : Cannot allocate memory*
> > >
> > >
> > > Where temp is a directory/file name we are trying to create. We are not
> > > doing "fdisk" before doing the mounting.
> > >
> > > Thanks in advance..
> > >
> > > Regards,
> > > Saquib Herman
> > >
> > > On Thu, Jan 14, 2010 at 4:10 AM, Charles Manning
> >
> > <manningc2@actrix.gen.nz>wrote:
> > > > On Wednesday 13 January 2010 20:10:27 Saquib wrote:
> > > > > Hi All,
> > > > >
> > > > > I am using the YAFFS for the linux 2.16.21 version. I am facing
> > > > > some problem.
> > > > >
> > > > > I am able to list my YAFFS and YAFFS2 file system in
> >
> > /proc/filesystems
> >
> > > > and
> > > >
> > > > > also created three partitions.
> > > > >
> > > > > But the problem is. I am not able to mount these partition on any
> > > > > of the folders by using mount command. Let me know what may the
> > > > > issue.
> > > >
> > > > You need to give some examples of the commands you are using and the
> > > > errors you are getting.
> > > >
> > > > > One more query is do we need to do a format before mounting the
> > > >
> > > > partition.
> > > >
> > > > No.
> > > >
> > > > Charles
> > > >
> > > > _______________________________________________
> > > > yaffs mailing list
> > > > yaffs@lists.aleph1.co.uk
> > > > http://lists.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs
> >
> > _______________________________________________
> > yaffs mailing list
> > yaffs@lists.aleph1.co.uk
> > http://lists.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs



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