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sfh_dm35x problem

I am trying to burn my flash using sfh_dm35x tools. But, I have the following errors messages.

I can fuse my flash using CCS. But, I can not fuse my flash using sfh_dm35x. 

my command is "sfh_dm35x.exe ublDM355.bin u-boot.bin".

"NAND block 0x00000001 is bad!!!"

"Target: Write verify failed!"

My hardware spec. are the followings.

1. CPU : DM355-270

2. Flash memory :  SAMSUNG K9F5608D0C

3. SDRAM :  SAMSUNG K4T1G164QA

I don't know the cause of these errors.