[U-Boot] fw_setenv device not accessible

[pshambhu]

Hi,
 
    I am unable to change the u-boot environment variables from the Linux
environment using fw_setenv and fw_printenv. 
I am able to list out the variables from the particular partition, but i am
unable to change the variable value using fw_setenv.

[Linux promp]# fw_setenv Status 0
Can't open /dev/mtd4: Permission denied
Error: can't write fw_env to flash

i tried to change the permission of /dev/mtd4 as well, but i am getting the
same problem.

Regards
Pradeep S



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