Don't take this an argument, but do you have a cite for those definitions?
I have cites that say otherwise, but the problem is that depending on which
cite/site you look at, you will find differing definitions for a carport.
The number of walls will vary, some say a carport is "usually" attached to
the side of building, others do not.
As examples...
From Wikipedia
"A carport is a covered structure used to offer limited protection to
vehicles, primarily cars, from the elements. The structure can either be
free standing or attached to a wall. Unlike most structures a carport does
not have four walls, and usually has one or two."
One or two walls is a cross between your definitions of a carport and
covered parking.
From
http://www.merriam-webster.com/dictionary/carport
"carport: a shelter for a car that has open sides and that is usually
attached to the side of a building."
As long as there are less than 3 walls, the words "open sides" would fit.
Again, a cross between two of your definitions.
From
http://dictionary.reference.com/browse/carport
"carport: a roofed, wall-less shed, usually projecting from the side of a
building, used as a shelter for an automobile"
"Wall-less" fits your definition of covered parking, not carport.
I really don't think there is a clear, specific definition of a carport.