In the i.MX23, there are no separate boot modes for each type of ECC level. The hardware ECC level to
use is embedded inside NCB block. The NCB data structure is itself protected using software ECC
(SEC-DED Hamming Codes). Driver reads raw 2112 bytes of first sector and runs through software ECC
engine that determines whether NCB data is valid or not.

HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
ARM-A-BOT REV 1.01
PowerPrep Debug Version
PowerPrep start initialize power...
Battery Voltage = 0.20V
No battery or bad battery detected!!!.Disabling battery voltage measurements./r/nLLLCFeb 26 201214:36:57
EMI_CTRL 0x1C084040
FRAC 0x92926192
init_ddr_mt46v32m16_133Mhz
power 0x00820710
Frac 0x92926192
start change cpu freq
hbus 0x00000003
cpu 0x00010001
LLLLLLLLFCLJUncompressing Linux... done, booting the kernel.
Linux version 2.6.35.3 (user@debian6) (gcc version 4.6.1 (Sourcery CodeBench Lite 2011.09-70) ) #107 PREEMPT Wed Jul 24 23:06:05 EEST 2013
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: ARM-A-BOT board
Ignoring unrecognised tag 0x54410009
Memory policy: ECC disabled, Data cache writeback
INITRD: 0x40400000+0x00400000 overlaps in-use memory region - disabling initrd
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: console=ttyAM0,115200 mem=64M
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 58576k/58576k available, 6960k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xfde00000 - 0xffe00000 ( 32 MB)
vmalloc : 0xc4800000 - 0xf0000000 ( 696 MB)
lowmem : 0xc0000000 - 0xc4000000 ( 64 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0290000 (2592 kB)
.text : 0xc0290000 - 0xc0601000 (3524 kB)
.data : 0xc0602000 - 0xc062bf20 ( 168 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:224
Console: colour dummy device 80x30
console [ttyAM0] enabled
Calibrating delay loop... 226.09 BogoMIPS (lpj=1130496)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
NET: Registered protocol family 16
regulator: vddd: 800 <--> 1575 mV at 1550 mV fast normal
regulator: vdddbo: 800 <--> 1575 mV fast normal
regulator: vdda: 1500 <--> 2275 mV at 1750 mV fast normal
regulator: vddio: 2800 <--> 3575 mV at 3300 mV fast normal
regulator: overall_current: fast normal
regulator: mxs-duart-1: fast normal
regulator: mxs-bl-1: fast normal
regulator: mxs-i2c-1: fast normal
regulator: mmc_ssp-1: fast normal
regulator: mmc_ssp-2: fast normal
regulator: charger-1: fast normal
regulator: power-test-1: fast normal
regulator: cpufreq-1: fast normal
i.MX IRAM pool: 28 KB@0xc4808000
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Switching to clocksource mxs clock source
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
Bus freq driver module loaded
mxs_cpu_init: cpufreq init finished
JFFS2 version 2.2. (NAND) б&#9560; 2001-2006 Red Hat, Inc.
msgmni has been set to 114
alg: No test for stdrng (krng)
cryptodev: driver loaded.
io scheduler noop registered
io scheduler cfq registered (default)
mxs-duart.0: ttyAM0 at MMIO 0x80070000 (irq = 0) is a DebugUART
brd: module loaded
loop: module loaded
SSFDC read-only Flash Translation layer
mtdoops: mtd device (mtddev=name/number) must be supplied
i.MX GPMI NFC
NFC: Version 0, 4-chip GPMI and BCH
Boot ROM: Version 0, Single/dual-chip boot area, no block mark swapping
Scanning for NAND Flash chips...
CHIP size: 134217728 PAGE size: 0
init_size defined
run init_size
INIT_SIZE ENTERED
AMD/SPANSION device info search...
TYPE 2
-----------------------------
NAND Flash Device Information
-----------------------------
Manufacturer : AMD/SPANSION (0x01)
Device Code : 0xf1
Cell Technology : SLC
Chip Size : 128 MiB
Pages per Block : 64
Page Geometry : 2048+64
ECC Strength : 4 bits
ECC Size : 512 B
Data Setup Time : 30 ns
Data Hold Time : 20 ns
Address Setup Time: 25 ns
GPMI Sample Delay : 6 ns
tREA : Unknown
tRLOH : Unknown
tRHOH : Unknown
Description : S34ML01G1
Block count : 3
Block size : 512
Metadata size: 10
Ecc strength : 4
Page size : 2112
------------
NFC Geometry
------------
ECC Algorithm : BCH
ECC Strength : 8
Page Size in Bytes : 2112
Metadata Size in Bytes : 10
ECC Chunk Size in Bytes: 512
ECC Chunk Count : 4
Payload Size in Bytes : 2048
Auxiliary Size in Bytes: 16
Auxiliary Status Offset: 12
Block Mark Byte Offset : 0
Block Mark Bit Offset : 0
NAND device: Manufacturer ID: 0x01, Chip ID: 0xf1 (AMD/SPANSION NAND 128MiB 3,3V 8-bit)
-----------------
Boot ROM Geometry
-----------------
Boot Area Count : 1
Boot Area Size in Bytes : 20971520 (0x1400000)
Stride Size in Pages : 64
Search Area Stride Exponent: 2
Scanning for an NCB fingerprint...
Looking for a fingerprint in page 0x0
Found a fingerprint
Scanning device for bad blocks
Bad eraseblock 187 at 0x000001760000
Bad eraseblock 1022 at 0x000007fc0000
Boot area protection is enabled.
Creating 2 MTD partitions on "gpmi-nfc-main":
0x000000000000-0x000001400000 : "gpmi-nfc-0-boot"
mtd: Giving out device 0 to gpmi-nfc-0-boot
0x000001400000-0x000008000000 : "gpmi-nfc-general-use"
mtd: Giving out device 1 to gpmi-nfc-general-use
ftl_cs: FTL header not found.
PPP generic driver version 2.4.2
usbcore: registered new interface driver asix
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
fsl-ehci fsl-ehci: Freescale On-Chip EHCI Host Controller
fsl-ehci fsl-ehci: new USB bus registered, assigned bus number 1
fsl-ehci fsl-ehci: irq 11, io base 0x80080000
fsl-ehci fsl-ehci: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
WARNING : No battery connected !
Aborting power driver initialization
mxs-battery: probe of mxs-battery.0 failed with error 1
mxs watchdog: initialized, heartbeat 19 sec
cpuidle: using governor ladder
cpuidle: using governor menu
dcp dcp.0: DCP crypto enabled.!
ip_tables: (C) 2000-2006 Netfilter Core Team
TCP cubic registered
NET: Registered protocol family 10
IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
Freeing init memory: 2592K


Starting ARM-A-BOT system...
VER 1.01

Please press Enter to activate this console.
[root@arm-a-bot /]$mkdir /mnt
[root@arm-a-bot /]$mkdir /mnt/nf
[root@arm-a-bot /]$mount -t jffs2 /dev/mtdblock1 /mnt/nf
JFFS2 doesn't use OOB.
[root@arm-a-bot /]$cd /mnt/nf
[root@arm-a-bot nf]$dir
nfi
[root@arm-a-bot nf]$cat nfi
This is a test file
[root@arm-a-bot nf]$df -h
Filesystem Size Used Available Use% Mounted on
/dev/mtdblock1 108.0M 2.8M 105.2M 3% /mnt/nf
[root@arm-a-bot nf]$