Thanks for the reply and your work.
Ok .. currently I am trying the "NEXT".
Wifi seems to work.
Except there is frequent kernel(module)-message:
"xradio_wlan mmc1:0001:1: missed interrupt"
Can't I reduce the kernel debug level to hide this message somehow?
I tryied dmesg -n 5, /etc/sysctl.conf->"kernel.printk = "3 4 1 3" and
sysctl -w kernel.printk="2 4 1 7"
These did not help.
PS: Now also it seems that the serial tty-interface is somehow disabled.