BBB boot failure between r366365 and r366386

[Ed Maste]

On Mon, 5 Oct 2020 at 15:56, Ed Maste <emaste at freebsd.org> wrote:
>
>   On Mon, 5 Oct 2020 at 09:53, Ed Maste <emaste at freebsd.org> wrote:
> >
> > Sometime after r366365 and up to r366365 BBB stopped booting in the HW
> > test environment.
>
> That should of course be after r366365 and up to (and including)
> r366386.

Discussed on IRC; the second U-Boot banner comes out ~60s after the
first, which might suggest a watchdog timeout.

We seem to get stuck after
> random: unblocking device.