Error message on uboot.

"Timeout poll on Interrupt endpoint"

I have a Raspberry pi 2 B+ and Fedora-KDE-armhfp-29-1.2-sda.raw.xz installed on a 32gb SD card.

I gather that it has something to do with USB ports.  I have a WiFi adapter and a wireless keyboard adapter plugged in two USB ports of the Raspberry Pi, and that's it.

Does anyone have any ideals ?