I have a Z270 Classified on 1.02 and during boot it pauses on A2, sometimes A0, for about 30 seconds or more. This is the "IDE Detect" phase.
Drive setup is 2x Samsung Pro 960 NVMe cards, a Samsung Pro 850 in the first Intel Sata port, two Evo 840's in two Marvel ports and two older BD-RW's in the other two Marvel SATA ports. They all work just fine.
Same thing occurs with hotplug enabled or disabled.
Before I start pulling random things out to see if anything makes it better, would anyone happen to have thoughts on what might cause the pause? :)