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Roll back to hw hamming ecc mode for dm8168 in DVRRDK_04.01.00.02

KAMI QU
Prodigy 20 points

Hi sir,

I want to roll back to hw hamming ecc mode in order to use jiffs2 filesystem.

I follow the guide, which in 2.8 release .

    1.Refer this document for details - DM81xx_DVR_RDK_NAND_ECC_App_Notes.pdf
    2.Patches - 1BitECC_LSP_Patches.tar.gz

and there is my detail steps:

boot from DHCP
nand scrub
setenv serverip 192.168.2.170     
setenv ipaddr 192.168.2.171
nandecc hw 0
save
mw.b 0x81000000 0xFF 0x260000
tftp 0x81000000 uboot_NAND_DM816X_UD_DVR
nand erase 0x0 0x260000 
nandecc hw 0
nand write.i 0x81000000 0x0 0x260000
mw.b 0x81000000 0xFF 0x400000
tftp 0x81000000 uImage
nand erase 0x400000 0x400000 
nandecc hw 0
nand write.i 0x81000000 0x400000 0x400000

mw.b 0x81000000 0xFF 0x3000000
tftp 0x81000000 ubi.img
tftp 0x81000000 HDEX_V1V2_2.0.1239T.img
nand erase 0x800000 0x3000000
nandecc hw 0
nand write.i 0x81000000 0x800000 0x3000000
after all done, reboot the target, the system hang, print nothing.
Is there anyting wrong or I missed?