Diskless rPi 3 boot error.
After unboxing a new rpi3, applying 2016-09-20-netboot-lmce to an SD-card and doing all the steps needed on the core. Diskless boot starts and options display on an existing orbiter. After diskless install the Pi reboots with "rainbow screen" and nothing happen. To get it working i replaced the bootcode.bin on the SD card with the one from the Pi´s folder in /tftpboot/ on the core. After that everything is happy.