Nand flash driver give error ( uncorrectable ECC error )

I compiled openwrt for a new device and the initramfs is booted successfully all functions is working properly but when I try to install permanently flashing factory file on the nand flash I get ( uncorrectable ECC error) the nand flash is ( hynix H27U518S2CT ) ( nand: 64 MiB, SLC, erase size: 16 KiB, page size: 512, OOB size: 16 )
when I reflash the device by the original image the device boot normally so the nand flash is in good condition , I think the problem with the nand driver specially ( subpages ecc corrections )
I also tried ( nand-ecc-mode = "soft") option in my dts file got also error.
any advice will be appreciated
thanks .
here is my log

[    0.439753] nand: device found, Manufacturer ID: 0xad, Chip ID: 0x76
[    0.446266] nand: Hynix NAND 64MiB 3,3V 8-bit
[    0.450713] nand: 64 MiB, SLC, erase size: 16 KiB, page size: 512, OOB size: 16
[    0.458318] Scanning device for bad blocks
[    0.494709] random: fast init done
[    0.680229] random: crng init done
[    0.704264] Bad eraseblock 3674 at 0x000003968000
[    0.732519] 2 fixed-partitions partitions found on MTD device ar934x-nand
[    0.739435] Creating 2 MTD partitions on "ar934x-nand":
[    0.744771] 0x000000000000-0x000000400000 : "kernel"
[    0.750947] 0x000000400000-0x000001400000 : "rootfs"
[    0.757593] mtd: device 11 (rootfs) set to be root filesystem
[    0.765165] __nand_correct_data: uncorrectable ECC error
[    0.770619] mtdsplit: error occured while reading from "rootfs"
[    0.777709] libphy: Fixed MDIO Bus: probed
[    1.101936] libphy: ag71xx_mdio: probed
[    1.107224] ag71xx 19000000.eth: connected to PHY at fixed-0:00 [uid=00000000, driver=Generic PHY]
[    1.117093] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: rgmii
[    1.126041] NET: Registered protocol family 10
[    1.136461] Segment Routing with IPv6
[    1.140393] NET: Registered protocol family 17
[    1.145040] 8021q: 802.1Q VLAN Support v1.8
[    1.152768] PCI host bridge /ahb/pcie-controller@180c0000 ranges:
[    1.159036]  MEM 0x0000000010000000..0x0000000013ffffff
[    1.164371]   IO 0x0000000000000000..0x0000000000000000
[    1.169911] PCI host bridge to bus 0000:00
[    1.174127] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[    1.181131] pci_bus 0000:00: root bus resource [io  0x0000]
[    1.186805] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    1.193715] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    1.203557] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1001ffff 64bit]
[    1.211055] pci 0000:00:00.0: BAR 6: assigned [mem 0x10020000-0x1002ffff pref]
[    1.221565] __nand_correct_data: uncorrectable ECC error
[    1.227030] print_req_error: I/O error, dev mtdblock11, sector 0
[    1.233196] SQUASHFS error: squashfs_read_data failed to read block 0x0
[    1.239963] squashfs: SQUASHFS error: unable to read squashfs_super_block
^[[    1.247201] VFS: Cannot open root device "(null)" or unknown-block(31,11): error -5
[    1.255020] Please append a correct "root=" boot option; here are the available partitions:
[    1.263520] 1f00             256 mtdblock0
[    1.263524]  (driver?)
[    1.270190] 1f01              64 mtdblock1
[    1.270193]  (driver?)
[    1.276861] 1f02              64 mtdblock2
[    1.276864]  (driver?)
[    1.283552] 1f03              64 mtdblock3
[    1.283555]  (driver?)
[    1.290229] 1f04              64 mtdblock4
[    1.290232]  (driver?)
[    1.296899] 1f06               1 mtdblock6
[    1.296901]  (driver?)
[    1.303554] 1f07               2 mtdblock7
[    1.303557]  (driver?)
[    1.310222] 1f08              64 mtdblock8
[    1.310225]  (driver?)
[    1.316892] 1f09              64 mtdblock9
[    1.316895]  (driver?)
[    1.323567] 1f0a            4096 mtdblock10
[    1.323570]  (driver?)
[    1.330329] 1f0b           16384 mtdblock11
[    1.330332]  (driver?)
[    1.337084] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,11)
[    1.346825] Rebooting in 1 seconds..

here is error ( hardware ECC is not available for 512 byte pages)
anyone know the meaning of this error

[    0.442611] nand: device found, Manufacturer ID: 0xad, Chip ID: 0x76
[    0.449125] nand: Hynix NAND 64MiB 3,3V 8-bit
[    0.453573] nand: 64 MiB, SLC, erase size: 16 KiB, page size: 512, OOB size: 16
[    0.461030] ar934x-nand 1b000200.nand: hardware ECC is not available for 512 byte pages
[    0.469169] ar934x-nand 1b000200.nand: nand_scan failed, err:-22
[    0.475315] ar934x-nand: probe of 1b000200.nand failed with error -22
[    0.482887] libphy: Fixed MDIO Bus: probed
[    0.806787] libphy: ag71xx_mdio: probed
[    0.812088] ag71xx 19000000.eth: connected to PHY at fixed-0:00 [uid=00000000, driver=Generic PHY]
[    0.822009] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: rgmii
[    0.831031] NET: Registered protocol family 10
[    0.841506] Segment Routing with IPv6
[    0.845425] NET: Registered protocol family 17
[    0.850062] 8021q: 802.1Q VLAN Support v1.8
[    0.857832] PCI host bridge /ahb/pcie-controller@180c0000 ranges:
[    0.864104]  MEM 0x0000000010000000..0x0000000013ffffff
[    0.869426]   IO 0x0000000000000000..0x0000000000000000
[    0.874955] PCI host bridge to bus 0000:00
[    0.879172] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[    0.886174] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.891847] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    0.898756] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.908607] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1001ffff 64bit]
[    0.916107] pci 0000:00:00.0: BAR 6: assigned [mem 0x10020000-0x1002ffff pref]
[    0.925831] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    0.933484] Please append a correct "root=" boot option; here are the available partitions:
[    0.941986] 1f00             256 mtdblock0
[    0.941990]  (driver?)
[    0.948643] 1f01              64 mtdblock1
[    0.948646]  (driver?)
[    0.955296] 1f02              64 mtdblock2
[    0.955298]  (driver?)
[    0.961961] 1f03              64 mtdblock3
[    0.961964]  (driver?)
[    0.968619] 1f04              64 mtdblock4
[    0.968622]  (driver?)
[    0.975272] 1f06               1 mtdblock6
[    0.975275]  (driver?)
[    0.981936] 1f07               2 mtdblock7
[    0.981939]  (driver?)
[    0.988594] 1f08              64 mtdblock8
[    0.988597]  (driver?)
[    0.995248] 1f09              64 mtdblock9
[    0.995250]  (driver?)
[    1.001910] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    1.011346] Rebooting in 1 seconds..