The documentation's sample scan predates SPD instantiation at probe. It
shows 0x36, 0x50 and 0x52 as detected addresses, but the driver claims
them itself now, so a real run reports UU there and 0x37 as well. The
example printed output the driver can no longer produce.
Measured on the X299 system, both channels identical:
0 1 2 3 4 5 6 7 8 9 a b c d e f
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: 30 31 -- -- 34 35 UU UU -- -- -- -- -- -- -- --
50: UU -- UU -- -- -- -- -- -- -- -- -- -- -- -- --
Say what the UU entries are, since the section that explains
instantiation comes further down and a reader scanning the bus meets
them first.