I took the occasion to check what is the mechanism of overriding.
Below what myself found in Bitbake User Manual, ch. 3.3. Conditional Syntax
(Overrides) "You can use OVERRIDES to ... conditionally append or prepend
the value of a variable."
This is the point where I wonder why overriding is discussed in context of
append and prepend.
Which element of appending and prepending operations has the nature of
overriding other things?
I am also not comfortable with two first examples provided in chapter myself referred previously too.
The first one, short one: why is "_nooverride = blabla" component necessary?
Will variable default value not suffice?
The second one, longer one: It does not include the OVERRIDES = "blabla" component.
Hence, the question is this override-code complete?