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

[Nikolai Zhubr]

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 
its mini-usb connector to a computer. The problem does not happen if 12V 
power connector is also empoyed. (Note: the example attached below is 
for RC1, but RC2 is no different)
I can't say if such problem was also present in previous version of 
u-boot or not.


Thank you,

Regards,
Nikolai

U-Boot 2019.01-rc1 (Dec 13 2018 - 15:11:11 +0300) Allwinner Technology

CPU:   Allwinner A20 (SUN7I)
Model: Olimex A20-Olinuxino Micro
I2C:   ready
DRAM:  1 GiB
MMC:   SUNXI SD/MMC: 0, SUNXI SD/MMC: 1
Loading Environment from FAT... MMC: no card present
In:    serial
Out:   serial
Err:   serial
Net:   eth0: ethernet at 1c50000
starting USB...
USB0:   USB EHCI 1.00
USB1:   USB OHCI 1.0
USB2: