~ # /mtd/sbin/flash_erase /dev/mtd0 0 0
Erasing 128 Kibyte @ 1dfe0000 -- 100 % complete 

~ # echo all > /proc/yaffs 
~ # mkdir -p /mnt/nand
~ # mount -t yaffs2 /dev/mtdblock0 /mnt/nand 
yaffs: dev is 32505856 name is "mtdblock0" rw
yaffs: passed flags ""
<7>yaffs: nandmtd2_read_chunk_tags chunk 90880 data   (null) tags cc469bc8
<7>yaffs: packed tags obj -1 chunk -1 byte -1 seq -1
<7>yaffs: packed tags obj -1 chunk -1 byte -1 seq -1

~ # cd mnt/nand/
/mnt/nand # ls
lost+found
/mnt/nand # cat /proc/yaffs 
Multi-version YAFFS built:Jan 11 2012 09:16:37


Device 0 "jffs2"
start_block.......... 0
end_block............ 3839
total_bytes_per_chunk 2048
use_nand_ecc......... 1
no_tags_ecc.......... 0
is_yaffs2............ 1
inband_tags.......... 0
empty_lost_n_found... 1
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...... 3840
blocks_in_checkpt.... 0

n_tnodes............. 0
n_obj................ 4
n_free_chunks........ 245760

n_page_writes........ 0
n_page_reads......... 0
n_erasures........... 0
n_gc_copies.......... 0
all_gcs.............. 0
passive_gc_count..... 0
oldest_dirty_gc_count 0
n_gc_blocks.......... 0
bg_gcs............... 0
n_retried_writes..... 0
n_retired_blocks..... 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
tags_used............ 0
summary_used......... 0
/mnt/nand # cd lost\+found/
/mnt/nand/lost+found # ls
/mnt/nand/lost+found # cd ..
/mnt/nand # mkdir test

Unable to handle kernel paging request for data at address 0x0000040f
Faulting instruction address: 0xc0119a20
Oops: Kernel access of bad area, sig: 11 [#1]
BRE750FX
last sysfs file: /sys/devices/platform/bre_nand.0/mtd/mtd0/flags
Modules linked in:
NIP: c0119a20 LR: c0119a08 CTR: c017a624
REGS: cc46bac0 TRAP: 0300   Not tainted  (2.6.39.3-svn471)
MSR: 00009032 <EE,ME,IR,DR>  CR: 24044282  XER: 20000000
DAR: 0000040f, DSISR: 42000000
TASK = cbc58b40[841] 'mkdir' THREAD: cc46a000
GPR00: 80000001 cc46bb70 cbc58b40 0000001f c04545ea 00000019 c0452eb0 00004000 
GPR08: 000000ff c0349700 0000040b 0000030c 24044222 100db7cc cc46bc28 c02da4b8 
GPR16: 40000010 c02da430 c02da380 c02da3e0 c02da3b0 c0350000 00000000 cbd52800 
GPR24: 00000001 00000000 00000000 00000041 cc46bcc8 00000041 cbd5a000 00000041 
NIP [c0119a20] yaffs_summary_add+0xb8/0x264
LR [c0119a08] yaffs_summary_add+0xa0/0x264
Call Trace:
[cc46bb70] [c0119a08] yaffs_summary_add+0xa0/0x264 (unreliable)
[cc46bc00] [c01145a0] yaffs_wr_chunk_tags_nand+0x8c/0xfc
[cc46bc20] [c010ec98] yaffs_write_new_chunk+0x2dc/0x588
[cc46bcc0] [c011078c] yaffs_update_oh+0x298/0x498
[cc46be80] [c0116510] yaffs_set_attribs+0xa8/0xc0
[cc46be90] [c01086d4] yaffs_setattr+0xd4/0x190
[cc46beb0] [c00a15a8] notify_change+0xf0/0x2a8
[cc46bee0] [c0088238] sys_fchmodat+0xb8/0xdc
[cc46bf40] [c000f1ac] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xfdc08ec
    LR = 0x10031a64
Instruction dump:
7f84e378 38610008 4bffa6a9 3c60c02e 3863be8c 4bf03f75 811e0e08 57e0103a 
57eb2036 7d605850 80010010 7d4b4214 <900a0004> 81210014 912a0008 8001000c 
---[ end trace 2587c3887bbd6046 ]---
Segmentation fault
/mnt/nand # yaffs: yaffs_write_super 
Unable to handle kernel paging request for data at address 0x00000113
Faulting instruction address: 0xc0108000
Oops: Kernel access of bad area, sig: 11 [#2]
BRE750FX
last sysfs file: /sys/devices/platform/bre_nand.0/mtd/mtd0/flags
Modules linked in:
NIP: c0108000 LR: c0109dfc CTR: c017a624
REGS: cc46fea0 TRAP: 0300   Tainted: G      D      (2.6.39.3-svn471)
MSR: 00009032 <EE,ME,IR,DR>  CR: 24002084  XER: 20000000
DAR: 00000113, DSISR: 40000000
TASK = cc43b2c0[79] 'sync_supers' THREAD: cc46e000
GPR00: 000000ff cc46ff50 cc43b2c0 cbd5a000 00000000 ffffffff c0452eb0 00000000 
GPR08: 000000ff 000000ff 000000ff 0000fe01 24000082 100db7cc 00000001 0d0cc000 
GPR16: 0000003f 0cff2d24 0cfaaaac 0cfaa6ac 00000000 0cfaa2c6 00000001 0cfaa268 
GPR24: 00000000 c003795c c0350000 cc425f44 00000000 00000000 cbcc1a00 cbd5a000 
NIP [c0108000] yaffs_bg_gc_urgency+0x24/0x70
LR [c0109dfc] yaffs_do_sync_fs+0x3c/0x17c
Call Trace:
[cc46ff80] [c008c5f0] sync_supers+0xf8/0x110
[cc46ffa0] [c006ab60] bdi_sync_supers+0x30/0x54
[cc46ffb0] [c00379d8] kthread+0x7c/0x80
[cc46fff0] [c000dd84] kernel_thread+0x4c/0x68
Instruction dump:
38000000 90030008 4e800020 8103000c 38e00000 80030124 81230d48 7d6801d6 
81430090 7f8b4840 409c0008 7ceb4850 <800a0014> 2f800000 419e003c 5500083c 
---[ end trace 2587c3887bbd6047 ]---
yaffs: yaffs_background
yaffs: yaffs locking cbc59680
Unable to handle kernel paging request for unknown fault
Faulting instruction address: 0xc02524e0
Oops: Kernel access of bad area, sig: 11 [#3]
BRE750FX
last sysfs file: /sys/devices/platform/bre_nand.0/mtd/mtd0/flags
Modules linked in:
NIP: c02524e0 LR: c0108150 CTR: c017a624
REGS: cc48be70 TRAP: 0600   Tainted: G      D      (2.6.39.3-svn471)
MSR: 00009032 <EE,ME,IR,DR>  CR: 24000082  XER: 20000000
DAR: 00000117, DSISR: 00000000
TASK = cbc59680[835] 'yaffs-bg-1' THREAD: cc48a000
GPR00: c0108190 cc48bf20 cbc59680 00000117 00265f18 ffffffff c0452eb0 00004000 
GPR08: 00265f18 c0349700 00265f18 c03503d0 44000082 100db7cc 00000001 0d0cc000 
GPR16: 0000003f 0cff2d24 c02d96ec c0350000 c0350000 c0340000 c010b3dc cbd4b000 
GPR24: cc48bf38 0000627e cbd5a000 000061b6 000061b6 000060bc c0350000 cbd5a000 
NIP [c02524e0] mutex_lock+0x0/0x1c
LR [c0108150] yaffs_gross_lock+0x30/0x74
Call Trace:
[cc48bf20] [c0108190] yaffs_gross_lock+0x70/0x74 (unreliable)
[cc48bf30] [c010b474] yaffs_bg_thread_fn+0x78/0x204
[cc48bfb0] [c00379d8] kthread+0x7c/0x80
[cc48bff0] [c000dd84] kernel_thread+0x4c/0x68
Instruction dump:
4bdc6895 80010014 38210010 7c0803a6 4e800020 7c001828 30000001 7c00192d 
40a2fff4 2f800000 4dbd0020 4bffffb0 <7c001828> 3000ffff 7c00192d 40a2fff4 
---[ end trace 2587c3887bbd6048 ]---

/mnt/nand # cat /proc/yaffs
Multi-version YAFFS built:Jan 11 2012 09:16:37


Device 0 "(null)"
start_block.......... 255
end_block............ 255
total_bytes_per_chunk 255
use_nand_ecc......... 255
no_tags_ecc.......... 255
is_yaffs2............ 255
inband_tags.......... 255
empty_lost_n_found... 255
disable_lazy_load.... 255
refresh_period....... 255
n_caches............. 255
n_reserved_blocks.... 255
always_check_erased.. 255

data_bytes_per_chunk. 255
chunk_grp_bits....... 0
chunk_grp_size....... 255
n_erased_blocks...... 255
blocks_in_checkpt.... 255

n_tnodes............. 255
n_obj................ 255
n_free_chunks........ 255

n_page_writes........ 255
n_page_reads......... 255
n_erasures........... 255
n_gc_copies.......... 255
all_gcs.............. 255
passive_gc_count..... 255
oldest_dirty_gc_count 255
n_gc_blocks.......... 255
bg_gcs............... 255
n_retried_writes..... 255
n_retired_blocks..... 255
n_ecc_fixed.......... 255
n_ecc_unfixed........ 255
n_tags_ecc_fixed..... 255
n_tags_ecc_unfixed... 255
cache_hits........... 255
n_deleted_files...... 255
n_unlinked_files..... 255
refresh_count........ 255
n_bg_deletions....... 255
tags_used............ 255
summary_used......... 255
/mnt/nand # 

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