[Arm-dev] rbf for olinuxino-micro

I've managed to create Fedora 22 image running on olinuxino-micro (with HDMI support! hooray! (:) ) using rbf script. My goal is of course CentOS7 but before that i have two issues: - i don't know how to generate /boot/extlinux/extlinux.conf (in official Fedora image in comment it says it was generated by appliance-creator). Is there any (automated) way to do it properly? - rootpass.exp doesn't work, it hangs on 'passwd' command. If i kill it, rbf will continue, but of course root password won't be set. I tried to run rbf with LC_ALL=C but it doesn't help.