If you follow this one,

https://raspberry-projects.com/pi/programming-in-c/uart-serial-port/using-the-uart

You should see whats going on from the beginning, a copy of that will help out alot


On Fri, Apr 19, 2019 at 6:29 PM Peter Robinson <pbrobinson@gmail.com> wrote:
On Fri, Apr 19, 2019 at 6:18 PM JAMES TATE <binarynut@comcast.net> wrote:
>
> 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 ?

At what point in the boot do you get that error, is it in linux, or
before linux starts? What happens if you remove the wifi/keyboard and
see if it boots to completion and then plug them in?

Can you try the latest Fedora 30 nightly? F-29 is quite old now.

Peter
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