After using a plain vanilla instead of a vendor kernel I do have problems with 
fw_setenv.
Althoug fw_printenv still works fine, after usage of fw_setenv the environment 
is destroyed, CRC error.

I checked a lot of things, changed u-boot, devicetree, fw_setenv ... and 
finally came to the point, that it just depends on the kernel. Only changing 
the kernel makes the difference. I assume that there is an option not enabled. 
Honestly, I am lost with the differences - I couldn't identify the one that 
makes difference. 
Using an older config file, with lot more options, than it works also with a 
newer kernel.

Someone has an idea, which of the million settings is my friend? CONFIG_CRC16 
and 32 are both enabled.

Best regards
Arno
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