Having CHDKPTP on a headless mini board to get your photo taken under software control has many advantages.
For the moment not much additional info is available, unless you add it yourself. So maybe a good place to visit is the *CHDKPTP on BeagleBone Black page. More info should be available there and should almost be the same as for ODroidXU
If you do not want to crosscompile, then there is good new for you; chdkptp just works out of the box on an OdroidXU with Ubuntu 14.04 as OS
Links related to getting it to work would be here if there were any.