Steffen, I tried create my own ISO (tumbleweed) with similar to Ivan's mksusecd command line args. I see issue when booting newly created ISO with initrd - the kernel cannot execute /init (linuxrc) because the loader cannot find /lib/ld-linux-aarch64.so.1. Looking into initrd (on the new ISO) I see that /lib is __not__ a symlink to /usr/lib (where the .so lib is).