A wall-bolted post sits flush against an existing structure with masonry anchors or chemical anchors, dumping all gate load into the wall. Resistance to gate weight and wind comes from the wall's anchor pull-out capacity, which depends on the wall material (brick, blockwork, reinforced concrete) and the anchor type.
Wall-bolted posts are common at the hinge side of pedestrian gates that land on the side of a house or garage. They save you from digging a footing right next to the building, but the host wall has to be sound enough to take the load. Old single-leaf brick walls often aren't. In that case, a concreted post next to the wall is the safer call.
CAD60 surfaces wall-bolted as one of three mounting options per post in the drawing pack.