Dear pshambhu,
In message 1383039837672-166275.post@n7.nabble.com you wrote:
I am unable to change the u-boot environment variables from the Linuxenvironment 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.
Obviously partition mtd4 is mapped as read-only. You need read-write mode instead. This has nothing to do with the permissions on the /dev/mtd4 special file, but with the mapping of the MTD device in the device tree or the mtdargs boot argument or however you pass that information to Linux on your system.
Best regards,
Wolfgang Denk