use fw_printenv for get U-boot's env

I want to use fw_printenv for get U-boot's env.

$cat /proc/mtd

mtd0: 00060000 00004000 "bootloader"
mtd1: 00200000 00004000 "kernel"
mtd2: 03c00000 00004000 "root"

and

$vi /etc/fw_env.config

# Configuration file for fw_(printenv/saveenv) utility.
# Up to two entries are valid, in this case the redundand开发者_Python百科
# environment sector is assumed present.

# MTD device name       Device offset   Env. size       Flash sector size
/dev/mtd0               0x0000          0x60000         0x4000

then

$ fw_printenv

Warning: Bad CRC, using default environment
bootcmd=bootp; setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; bootm
bootdelay=5
baudrate=115200

would you tell me what's wrong?

thanks a lot. ^^

I got it.

# MTD device name       Device offset   Env. size       Flash sector size
/dev/mtdblock0               0x40000          0x20000         0x4000