Hello I would like to know how to make a sd with multiple operating systems.I have orange pi 2. Thanks.

I am interesting too. I need to have an ability quickly swith OS'es between Android and Debian. How-to?

u-boot example http://forum.odroid.com/viewtopic.php?f=112&t=8740

Thanks! This is exactly what I need.

I will probably implement multi boot on OrangePI, similar to that on Odroid C1. Maybe next month...