fw_printenv gives Warning: Bad CRC, using default environment.

[Nitishroy]

Hello Team,

I am trying to access u-boot environment from user space but facing issue with fw_utils like command fw_printenv always prints default environment instead of environment used on boot.

FYI: I have flashed my image in the emmc on iMX8QM_MEK board. So enabled the option for block devices in the fw_env.config file. 

Please help me to resolve this issue. 

Thank you.

[Zhiming_Liu]

Hi

Did you print the uboot env successfully?

In my test ,it would show Warning: Bad CRC, using default environment, but it can print uboot args successfully.

BR

Zhiming

[Nitishroy]

Yes I can print the default environment, with warning: Bad CRC. But it is not taking the upgraded environment that is created on boot.

Thank you.

[sinanakman]

Hi Nitishroy

It is possible that your u-boot is configured to save the environment to a device that is not configured properly or not configured at all. You might want to verify if CONFIG_SYS_MMC_ENV_DEV is set. On u-boot command line where you printed them, if you try to save them you might see where it is trying to save and if it fails.

Hope this helps.

Best regards

Sinan Akman

[Nitishroy]

Hi @sinanakman 

Yes, CONFIG_SYS_MMC_ENV_DEV is set in u-boot source code.

Thank you.

[sinanakman]

Hi Nitishroy

When you try to save the environment what do you get ? Does it hint at any error ?

Regards

Sinan Akman

[Zhiming_Liu]

HI

Tha just a warning and have no effect with uboot.

You can prevent the "Warning - bad CRC" by changing the u-boot configuration:

- disable CONFIG_ENV_IS_IN_FAT

- enable CONFIG_ENV_IS_NOWHERE

BR

Zhiming

[Nitishroy]

Hi
Actually the warning it is giving cause it is not finding correct environment variable and always switch to default environment. That's why the changes made in the u-boot with environment variable is not reflecting in the user space. So disabling the configuration suggested by you will not solve my problem.

Thank you.

[jerry_liu]

Hi,

I have the same problem.

Did you solve it?

Thanks!