What is the Linux built-in driver load order?

Question

How can we customize the built-in driver load order (to make some built-in driver module load first, and the dependent module load later)?

Answer 1

depmod examines the symbols exported and required by each module and does a topological sort on them that modprobe can later use to load modules in the proper order. Requiring the symbols from modules you wish to be dependent on is enough for it to do the right thing.