[U-Boot] fw_setenv not working

Hi,

im currently trying to set the u-boot environment variables by using fw_setenv. i hope my configuration everything is fine.. as im getting proper crc check and able to print environment variables, but not able to set using fw_setenv, as im getting the following error.

CRC error on /dev/mtd0 : Invalid argument Error: can't write fw_env to flash

Any help would be gr8..

Regards, Sandeep