I was able to get fedora running using a kernel from a raspian image (as proposed here). But when I replace the kernel7.img with the vmlinuz-4.2.3-300.fc23.armv7hl from a Fedora-Minimal(armhfp) the multicolor bootloader screen does not disappear and the green led blinks twice after power on, then stays off.
On the vfat boot partition I have all the content of both images. I basically only replace kernel=vmlinuz-4.2.3-300.fc23.armv7hl in config.txt.
Where and why does my attempt fail?