Re: u-boot debug, was: Re: U-boot on RPI3, sees disk but won't boot it

Well, I think the u-boot mailing lists are made for 
internal patch contributors. But it could be worth a try to subscribe to the list
and mark a message  as a bug report.
I would include  a short debug-log-snippet and ask if changing delays or adding a hub_reset function
could help out and then wait for answer.
I will not do that because I don’t own a an RPI 3B for testing.
https://lists.denx.de/listinfo/u-boot

Regards

Klaus