Try using inband tags instead.

mount -t yaffs2 -o inband-tags ....

The most common cause of the problem you see here is that the nand driver
does not support the oob/spare area properly.

That can be worked around by using inband tags which do not use the
oob/spare area.

-- Charles


On Tue, Jun 9, 2015 at 7:01 AM, Pawel Jasinski <pawel.jasinski@gmail.com>
wrote:

> It works, I changed config:
> CONFIG_YAFFS_DOES_ECC=y
> CONFIG_YAFFS_DISABLE_TAGS_ECC=y
>
> --pawel
>
>
> On Mon, Jun 8, 2015 at 2:56 PM, Pawel Jasinski <pawel.jasinski@gmail.com>
> wrote:
> > Hi,
> >
> > I have a device with kernel 2.6.36.
> > I am able to mount a yaffs file system and it appears to work.
> > However, the files are gone after power cycle.
> > What is the best way to diagnose this problem?
> > Any hints are greatly appreciated.
> >
> > --pawel
> >
> > # grep YAFFS .config
> > CONFIG_YAFFS_FS=y
> > CONFIG_YAFFS_YAFFS1=y
> > # CONFIG_YAFFS_9BYTE_TAGS is not set
> > # CONFIG_YAFFS_DOES_ECC is not set
> > CONFIG_YAFFS_YAFFS2=y
> > CONFIG_YAFFS_AUTO_YAFFS2=y
> > # CONFIG_YAFFS_DISABLE_TAGS_ECC is not set
> > # CONFIG_YAFFS_DISABLE_WIDE_TNODES is not set
> > # CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set
> > CONFIG_YAFFS_SHORT_NAMES_IN_RAM=y
> > # CONFIG_YAFFS_EMPTY_LOST_AND_FOUND is not set
> > # CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING is not set
> > # CONFIG_YAFFS_DISABLE_BACKGROUND is not set
> > CONFIG_YAFFS_XATTR=y
> >
> > # ps | grep yaffs
> > 94 0            0 SW   [yaffs-bg-1]
> >
> > # dmesgs
> > ...
> > yaffs: dev is 32505862 name is "mtdblock6" rw
> > yaffs: passed flags ""
> > yaffs: Attempting MTD mount of 31.6,"mtdblock6"
> > yaffs_read_super: is_checkpointed 0
> >
> > # cat /proc/yaffs
> > Multi-version YAFFS built:Jun  8 2015 09:08:54
> >
> >
> > Device 0 "Overlay"
> > start_block.......... 0
> > end_block............ 665
> > total_bytes_per_chunk 2048
> > use_nand_ecc......... 1
> > no_tags_ecc.......... 0
> > is_yaffs2............ 1
> > inband_tags.......... 0
> > empty_lost_n_found... 0
> > disable_lazy_load.... 0
> > refresh_period....... 500
> > n_caches............. 10
> > n_reserved_blocks.... 5
> > always_check_erased.. 0
> >
> > data_bytes_per_chunk. 2048
> > chunk_grp_bits....... 0
> > chunk_grp_size....... 1
> > n_erased_blocks...... 623
> > blocks_in_checkpt.... 0
> >
> > n_tnodes............. 199
> > n_obj................ 69
> > n_free_chunks........ 39969
> >
> > n_page_writes........ 4220
> > n_page_reads......... 1757
> > n_erasures........... 24
> > n_gc_copies.......... 1466
> > all_gcs.............. 301
> > passive_gc_count..... 301
> > oldest_dirty_gc_count 0
> > n_gc_blocks.......... 24
> > bg_gcs............... 24
> > n_retired_writes..... 0
> > nRetireBlocks........ 0
> > n_ecc_fixed.......... 0
> > n_ecc_unfixed........ 0
> > n_tags_ecc_fixed..... 0
> > n_tags_ecc_unfixed... 0
> > cache_hits........... 0
> > n_deleted_files...... 0
> > n_unlinked_files..... 0
> > refresh_count........ 1
> > n_bg_deletions....... 0
>
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