With update to yocto2.3 I started using the vanilla 4.9 kernel. (currently out 
of tree, as I don't know howto build a recipe to build from kernel.org 
This works for me with minor changes (backporting the spi-zynq-qspi.c).

But I found a strange problem. The tool "fw_setenv" (out of u-boot utils) 
doesn't work anymore - after usage I get a destroyed environment. ("fw_readenv 
works - but only until usage of fw_setenv).
I checked a few things, but I end up, that just changing the kernel is the 
issue (neither u-boot, nor the utils, nor the devicetree). I am wonding what 
can be the reason for that? Is some kernel setting missing?
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