[Yaffs] Partitial written blocks and retired blocks

System Settings:

Linux kernel version  -    2.6.23.12
NAND FLASH chip         -    Samsung 2GiB MLC K9LAG08
The NAND FLASH is used as root file system with Debian Etch for AMR
distribution.

Error(warning) messages:

The partial written block and set to retired message similar to the
following always appear when reboot,

Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
Partially written block 975 being set for retirement
**>> Block 975 retired

However do a cat /proc/yaffs shows no block is retired,

YAFFS built:Dec 27 2007 08:12:30
$Id: yaffs_fs.c,v 1.65 2007-12-13 15:35:17 wookey Exp $
$Id: yaffs_guts.c,v 1.54 2007-12-13 15:35:17 wookey Exp $

Device 0 "GESBC NAND FLASH"
startBlock......... 0
endBlock........... 8191
nDataBytesPerChunk. 2048
chunkGroupBits..... 0
chunkGroupSize..... 1
nErasedBlocks...... 6388
nReservedBlocks.... 5
blocksInCheckpoint. 0
nTnodesCreated..... 19100
nFreeTnodes........ 696
nObjectsCreated.... 15000
nFreeObjects....... 18
nFreeChunks........ 930337
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nShortOpCaches..... 10
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 389
nDeletedFiles...... 3130
nUnlinkedFiles..... 3176
nBackgroudDeletions 0
useNANDECC......... 1
isYaffs2........... 1


If the NAND FLASH is mounted as part of the file system but not the root,
there doesn't seem to be any of these kinds of messages.

The question is if those error (warning) messages serious. What would be
cause of those messages?

Thanks,

zl