[U-Boot] u-boot-fw-utils issue

[Heiko Schocher]

Hello Hardik Padhariya,

Am 09.01.2019 um 09:14 schrieb Hardik Padhariya:
> Hello,
> 
>   
> 
> We are trying to access uboot variables from our application running over
> Linux.
> 
>   
> 
> We are using Yocto krogoth 2.1.1 for imx6ul evaluation kit
> "mx6ul_14x14_evk".
> 
> We have built u-boot-fw-utils by adding "CORE_IMAGE_EXTRA_INSTALL +=
> "u-boot-fw-utils" in the local.conf file.
> 
>   
> 
> Issues:
> 
> 1. We are unable to update the existing uboot delay from the user space. We
> have tried updating it but it is not reflected once we reboot the device.
> 
> 2. We are unable to add the new variables in uboot. When we execute
> "fw_setenv board_name evalkit" then we can see it using fw_printenv but
> after rebooting the device when we check the boot variables using the
> command "printenv" (uboot command interface) then the variable is not shown.
> 
> 3. We also tried adding the variable through CONFIG_EXTRA_ENV_SETTINGS in
> mx6ul_14x14_evk.h  at ./tmp/work/../../include/configs/ but it is also not
> shown when we use fw_printenv command.
> 
>   
> 
> We get warning " Bad CRC, using default environment" if we try to set any
> variable using fw_setenv.

This means, that your fw_printenv util does not find the U-Boot
environment on your env storage device.

Yoiu have to add a "/etc/fw_env.config" file, which fit with your
device. See for some examples:

http://git.denx.de/?p=u-boot.git;a=blob;f=tools/env/fw_env.config;h=053895a2c07b23891e098c2370066204f04b8ea1;hb=aac0c29d4b8418c5c78b552070ffeda022b16949

I do not know the exact values for "mx6ul_14x14_evk" ...

bye,
Heiko
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