[U-Boot] cp.b command not working for copy to flash

[Nirav Rabara]

I am trying cp.b 22000000 10100000 180000 (i.e. copy from RAM to FLASH)
Its showing me message flash can't Erase.

But when i tried cp.b 10100000 22000000 180000 its working. (i.e. copy from
FLASH to RAM)
Can please anybody tell me what's going wrong??
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