@jpegxguy For the mainline ethernet tx/rx delays, were those just copied from the Rock64 or were they empirically determined? They're caused by trace impedance/etc, so they're tied to the specific hardware. I'll dig up the thread/tool Ayufan and Tkaiser were using and see what I get, there might be some more to gain there, since obviously the default ones are fairly bad.
@Igor Any argument against moving Ayufan's RK3328 mainline to "next" and putting true mainline at "dev"? I think it's to the point that 5.1/5.2 are nearly to RK3288 levels of support in mainline.