NanoPi M4V2 randomly drops ethernet

Troubleshooting
1

Hi, I’ve been using Dietpi on NanoPi M4V2 for about 6 months or so. Mostly without any major issues until recently. I did a fresh reinstall with v6.32.2, and it randomly drops Ethernet connection. The device is not connectable or seen by my router, so I cannot SSH into it. The device stays on (with the red led on), and it runs fine (until it drops Ethernet again) after I do a manual power button restart.

I’m not sure what the problem is and how to diagnose the issue. I’m currently testing the command I have found on https://tadeubento.com/2019/nanopi-m4-rk3399-network-issues/ to see if it solves anything.

sudo ethtool -K eth0 rx off tx off
2

Which kernel do you run at? uname -a

The offload workaround was required on older kernel versions but should not on current ones 5.6 and up AFAIK.

3

The Eth command didn’t solve the issue.

Uname -a shows

Linux DietPi 5.8.10-rockchip64 #20.08.3 SMP PREEMPT Fri Sep 18 11:05:12 CEST 2020 aarch64 GNU/Linux

I ran dmesg -l err,crit,alert,emerg

and this came back

[    2.540862] OF: graph: no port node found in /syscon@ff770000/usb2-phy@e450/otg-port
[    9.085288] rk_gmac-dwmac fe300000.ethernet: cannot get clock clk_mac_speed
[   54.219051] OF: graph: no port node found in /i2c@ff3d0000/typec-portc@22
[   54.515652] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4356-sdio for chip BCM4356/2
[   54.634998] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4356-sdio for chip BCM4356/2
[   54.648673] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4356/2 wl0: Mar  4 2020 22:06:08 version 7.35.349.87 (r724447 CY) FWID 01-c68a2890
4

these messages are right after system startup

would be good to know what messages will be renegaded during eth0 dropping. Maybe it would make sense to switch to full logging to keep log files after system restart.

5

BCM4356 is btw the WiFi adapter, so this is not related :thinking:.