serial via USB.

[FRANK333]

To control from terminal a remote orangepizeroplus in case of lockup, I connected the otg to the USB port of a second Opi0+ modifying a usb cable to which I disconnected the power cables (+red and -black).
I gave these commands on the orange to monitor:

# 	
echo "g_serial" >> /etc/modules
mkdir -p /etc/systemd/system/serial-getty@ttyGS0.service.d

nano /etc/systemd/system/serial-getty@ttyGS0.service.d/10-switch-role.conf
#add 2 lines save and exit
[Service]
ExecStartPre=-/bin/sh -c "echo 2 > /sys/bus/platform/devices/sunxi_usb_udc/otg_role"
	
systemctl --no-reload enable serial-getty@ttyGS0.service
echo "ttyGS0" >> /etc/securetty
reboot

on the second orange connected to the network, I made a simple script of serial activation:

simple script chmod +x,it disconnects with ctrl+a and then d

#!/bin/bash
dmesg | grep tty
sudo chmod 666 /dev/ttyACM0
echo "defscrollback 5000" > .screenrc  is 5,000 lines enough?
screen /dev/ttyACM0 115200

Everything works but in dmesg I have this warning:

cdc_acm 3-1:2.0: ttyACM0: USB ACM device
musb-hdrc musb-hdrc.2.auto: request 0000000019a4bba3 not queued to ep1in.

 

Sometimes after exiting the console I can't login again and I have to restart the service.

Someone, can explain me the problem or how to solve it?

 

 

[Werner]

Moved to Common issues / peer to peer technical support