Does DDR4 in general require periodic retraining, or is that just an LPDDR4 requirement? I can't seem to find much reference to DDR4 periodic retraining, but it's hard to prove a negative through the lack of search results :-)
Yeah, that's all for LPDDR4 though. I can't seem to find a system or a piece of firmware that claims to do retraining for "standard" DDR4 -- not sure if that's because of failing my searches or because it's just not needed for some reason.