know what? a little birdie just reminded me of this page: http://docs.ubports.com/en/latest/porting/ubp-5.1.html
it kinda says everything that needs to be said, no? had you seen this page? did you have to do something else? actually, which device are you working on?
I'm thinking of moving that page from porting (where frankly I had overlooked it) to system software development section....
I agree