Looking at the API, I really don't like the mixing of namespaces.
Either it's fw_ or it's firmware_ but not a mix of both.

I agree, that was not really clever.

	struct fw_loading { ... }
	__fw_loading_*()
	fw_loading_*()

Would that make more sense? firmware_loading_ as prefix is a bit long IMO.

Also looks like fw_loading_start() would do nothing as the struct is
likely zero initialised, and FW_STATUS_LOADING == 0. Maybe you need an
UNSET enum member?

Good point, I cut a corner here a bit :). In the spirit of making things 
more clear fw_loading_start() should be used.

FW_STATUS_ABORT <- FW_STATUS_ABORTED, to match the adjective suffixes
of the other members. Ditto fw_loading_abort() which doesn't abort
firmware loading but sets the status.

Okay.

Thanks a lot for the feedback.

cheers,
daniel