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TMS320DM8127: DM8127 NAND Flash Not booting ?

Part Number: TMS320DM8127

Hi sir,

we are TMS320DM8127CSK board totally in 6 boards, one board is not booting, Actually we are booting SD-card(u-boot) and baremetal MLO & Application flashing through u-boot commands, all boards are working. i am using below commands.

mmc rescan
nand erase 0x0 0x10000000
fatload mmc 0 0x80200000 MLO_BARE
nand write 0x80200000 0x0 0x80000
md 0x81200000 0x100
nand read 0x81200000 0x0 0x80000
md 0x81200000 0x100
fatload mmc 0 0x80280000 app
nand write 0x80280000 0x80000 0x100000
md 0x81280000 0x100
nand read 0x81280000 0x80000 0x1000000
md 0x81280000 0xBECD

After power off and On and NAND device able to read from sd-card(u-boot) bare metal data available in nand flash we cross checked from below commands.

md 0x81280000 0x100
nand read 0x81280000 0x80000 0x1000000
md 0x81280000 0xBECD

But it's not booting baremetal application code basic bootcode is booting in that code they are accessing nand device id etc.., then below message i am getting 

CARAVEL DM8127 BOOTLOADER1
Booting from NAND FLASH.........

*** ERROR : DEVICE MAY NOT BE ACCESSABLE OR NOT PRESENT.

It means block1 data i am not able read but through u-boot i am able to read app data properly from end it's there.

Thanking You,

Regards,

Ramachandra.