[U-Boot] Raspberry Pi 3(+) / 64bit bug with saveenv

Hi,

I see a strange problem with `saveenv` on Raspberry Pi 3 platform. Other Raspberry Pi (0/w/2) device work well with `saveenv`.

After I call the `saveenv` command, the device going into `fsm 1, hsts 00000001` loop. I try it with env file on ext/fat and on mmc.

Here is the bug report: https://github.com/home-assistant/hassos/issues/28

Anyone see a problem like this before?

greets Pascal