How to create a generic sum?

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Assuming you mean (n) will vary as "generic" per compile then one way is to declare a a large adder to accommodate max (n) then wire up per compile.

e.g.

sum <= A(1) + A(2) +A(3) +A(4) +A(5) + A(6) + A(7); -- 7 is max n

then for a given compile with n set to 3:

for i in 1 to 3 loop

A(i) <= a(i);

end loop;

That way the compiler will optimise off inputs A(4) ~ A(7)

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Thanks a lot! :)