[U-Boot] [linux-sunxi] A20-olinuxino-micro hangs in U-boot if powered from MINI-USB only.

[Diego Roversi]

On Mon, 24 Dec 2018 01:04:04 +0300
Nikolai Zhubr <n-a-zhubr at yandex.ru> wrote:

> Hi all,
> 
> I'm observing that the said A20-onlinuxino-micro board hangs in U-boot 
> in probing USB2 (see example below) in case it is powered by connecting 

I think it's normal. During the boot, u-boot initialize the usb otg, and for a fraction of second the power is disconnected. I solved it by attaching a battery (and I have a PSU as a side effect :) ).

Regards,
  Diego.

-- 
Diego Roversi <diegor at tiscali.it>