"host not reachable" - Can't SSH - Nano Pi R1

[arkadi]

Hello,

I was playing around with network settings trying to make armbian a router, but now I can't login via SSH.

armbian is installed to eMMC

Code: Select all

$ sudo arp-scan 192.168.0.1-192.168.3.1
[sudo] password for admin: 
WARNING: Could not obtain IP address for interface enp3s0. Using 0.0.0.0 for
the source address, which is probably not what you want.
Either configure enp3s0 with an IP address, or manually specify the address
with the --arpspa option.
Interface: enp3s0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.9.5 with 769 hosts (https://github.com/royhills/arp-scan)
192.168.0.14    12:81:3b:15:76:9c       (Unknown)
192.168.2.1     12:81:3b:15:76:9c       (Unknown)
192.168.2.20    12:81:3b:15:76:9c       (Unknown)

ssh admin@192.168.0.14
ssh: connect to host 192.168.0.14 port 22: Network is unreachable

how to reset? or reflash eMMC? or boot off of SD card?

1. I tried flashing SD card with nanopi-r1_eflasher_friendlywrt_4.14_armhf, doesn't seem to boot from that
2. held reset button a long time, doesn't seem to do anything

tips?

i was trying to run before, walking.

[arkadi]

so i guess i need a USB to TTL serial cable?

USB to TTL Serial Cable - Debug / Console Cable for Pi
https://www.friendlyarm.com/index.php?r ... uct_id=178
it says "Connect Matrix-USB2UART to NanoPi NEO/NEO Air/NEO2/NEO Plus2's serial Interface"

1. does this work with Nano Pi R1?
I see Nano Pi has "UART x1: 2.54mm pitch 4-pin-connector". I guess same size as this.
2. can i fix my problem from serial console - flash eMMC?

thank you

[guidol]

1. does this work with Nano Pi R1?
I see Nano Pi has "UART x1: 2.54mm pitch 4-pin-connector". I guess same size as this.
2. can i fix my problem from serial console - flash eMMC?

1.) The NPI R1 (not the new R1S) has the same 2.54mm Pinout as the Neo/Neo2 - should work.
2.) maybe you dont need to reflash - you could login via TTL-serial and correct your network settings without using a network/SSH

[arkadi]

2.) maybe you dont need to reflash - you could login via TTL-serial and correct your network settings without using a network/SSH

that would be great. i am having trouble getting TTL-serial connection to work. maybe you have some pointers?

this is what i tried so far

1) plugged in USB to TTY cable previous mentioned, (sys light blinking 2 fast, pause seems OK)
2) entered "dmesg" command:

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[  842.464315] usb 1-2: new full-speed USB device number 5 using xhci_hcd
[  842.612942] usb 1-2: New USB device found, idVendor=067b, idProduct=2303, bcdDevice= 3.00
[  842.612950] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  842.612955] usb 1-2: Product: USB-Serial Controller
[  842.612959] usb 1-2: Manufacturer: Prolific Technology Inc.
[  842.615428] pl2303 1-2:1.0: pl2303 converter detected
[  842.616434] usb 1-2: pl2303 converter now attached to ttyUSB0

3) entered "sudo setserial /dev/ttyUSB0"
/dev/ttyUSB0, UART: 16654, Port: 0x0000, IRQ: 0
4)entered "sudo minicom -s"
shows device offline, can't do anything
5)then tried "sudo screen /dev/ttyUSB0"
blank screen with cursor at top left
6) then I tried "sudo putty", serial connection with /dev/ttyUSB0, speed: 115200
it opens up a terminal window but it's blank and nothing happens.

i'm quite lost. i don't know how to connect to the Nano Pi with a serial cable. oh how i regret messing around with those network settings to make SSH un-accessible.

anybody have any troubleshooting tips?

info from statserial /dev/ttyUSB0

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Device: /dev/ttyUSB0

Signal  Pin  Pin  Direction  Status  Full
Name    (25) (9)  (computer)         Name
-----   ---  ---  ---------  ------  -----
FG       1    -      -           -   Frame Ground
TxD      2    3      out         -   Transmit Data
RxD      3    2      in          -   Receive  Data
RTS      4    7      out         1   Request To Send
CTS      5    8      in          1   Clear To Send
DSR      6    6      in          1   Data Set Ready
GND      7    5      -           -   Signal Ground
DCD      8    1      in          1   Data Carrier Detect
DTR     20    4      out         1   Data Terminal Ready
RI      22    9      in          1   Ring Indicator

[guidol]

6) then I tried "sudo putty", serial connection with /dev/ttyUSB0, speed: 115200
it opens up a terminal window but it's blank and nothing happens.

i'm quite lost. i don't know how to connect to the Nano Pi with a serial cable. oh how i regret messing around with those network settings to make SSH un-accessible.

anybody have any troubleshooting tips?

If the serial window is blank you could try to press enter to get a login prompt if the device has booted up.
If nothing appears after pressing enter/return then you could could try to switch rx with tx - some adaptors use rx-tx/tx-rx and some rx-rx/tx-tx

[arkadi]

If the serial window is blank you could try to press enter to get a login prompt if the device has booted up.
If nothing appears after pressing enter/return then you could could try to switch rx with tx - some adaptors use rx-tx/tx-rx and some rx-rx/tx-tx

thanks for the suggestion, but sadly it didn't work.

i wiggled the cable when it was plugged in and some weird characters came up on putty terminal
like this ░ ░

so maybe my cable is not good? i was plugging into the pins on the back. i will try to plug into the pins right on the board when I get more time.

i've almost given up troubleshooting this. i'm wasting too much time on this. i guess i shall use it as a paperweight if i can't get it to work

[guidol]

i've almost given up troubleshooting this. i'm wasting too much time on this. i guess i shall use it as a paperweight if i can't get it to work

How about booting armbian for the R1 from sdcard and installing armbian via armbian-config to emmc?

You could use this sdcard-image (flash it with etcher - after unpacking .7z - to the sdcard):
https://dl.armbian.com/nanopi-r1/archiv ... t_5.3.9.7z

[arkadi]

If the serial window is blank you could try to press enter to get a login prompt if the device has booted up.
If nothing appears after pressing enter/return then you could could try to switch rx with tx - some adaptors use rx-tx/tx-rx and some rx-rx/tx-tx

thanks for the suggestion, but sadly it didn't work.

i wiggled the cable when it was plugged in and some weird characters came up on putty terminal
like this ░ ░

so maybe my cable is not good? i was plugging into the pins on the back. i will try to plug into the pins right on the board when I get more time.

i've almost given up troubleshooting this. i'm wasting too much time on this. i guess i shall use it as a paperweight if i can't get it to work

the answer to my problem was UART doesn't work. I had to connect to the board headers to flash the eMMC.

I got this information from this tutorial: https://gist.github.com/pjobson/95b67bc ... 0bf15ca99d