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DM365 NAND erase issue

Hello,

I have Spectrum Digiatal DM365 EVM. I want to flash u-boot on nand via tftp. But during nand erase command. I am getting following error.


DM36x EVM #
DM36x EVM # tftpboot 0x80700000 u-boot-1.3.4-dm365_evm.bin
Using DaVinci-EMAC device
TFTP from server 192.168.1.127; our IP address is 192.168.1.110
Filename 'u-boot-1.3.4-dm365_evm.bin'.
Load address: 0x80700000
Loading: #############################
done
Bytes transferred = 146220 (23b2c hex)
DM36x EVM # nand erase 0x2C000 0x28000

NAND erase: device 0 offset 0x2c000, size 0x28000

nand0: MTD Erase failure: -22

nand0: MTD Erase failure: -22

OK
DM36x EVM #

Why this is coming??