[Upgrading cubox-i Buster from Kernel 5.7.y to 5.8.y breaks ethernet]

Here the details about my cubox i4 which also had network issues with 5.8.x. It is currently running smoothly with an older version. I hope somebody helps this information as such driver issues go beyond my knowledge.
 

cat /etc/armbian-release

# PLEASE DO NOT EDIT THIS FILE
BOARD=cubox-i
BOARD_NAME="Cubox i2eX/i4"
BOARDFAMILY=imx6
BUILD_REPOSITORY_URL=https://github.com/armbian/build
BUILD_REPOSITORY_COMMIT=b9814056
DISTRIBUTION_CODENAME=buster
DISTRIBUTION_STATUS=supported
VERSION=20.11.3
LINUXFAMILY=imx6
BRANCH=current
ARCH=arm
IMAGE_TYPE=stable
BOARD_TYPE=conf
INITRD_ARCH=arm
KERNEL_IMAGE_TYPE=Image

uname -a

Linux <hostname> 5.7.15-imx6 #20.08 SMP Mon Aug 17 07:36:36 CEST 2020 armv7l GNU/Linux

find /sys -name phy_id

/sys/devices/soc0/soc/2100000.bus/2188000.ethernet/mdio_bus/2188000.ethernet-1/$
find: ‘/sys/module/at803x/drivers’: Input/output error

ifconfig eth0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet <ip router>  netmask 255.255.255.0  broadcast <ip cubox>
        inet6 2001:9e8:208c:6800:84e5:8994:7642:4da2  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::3721:95e0:891b:d0ef  prefixlen 64  scopeid 0x20<link>
        ether d0:63:b4:00:32:d9  txqueuelen 1000  (Ethernet)
        RX packets 17508632  bytes 3075857589 (2.8 GiB)
        RX errors 0  dropped 4  overruns 0  frame 0
        TX packets 6162802  bytes 803661074 (766.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0Cubox

 

 

 

[Upgrading cubox-i Buster from Kernel 5.7.y to 5.8.y breaks ethernet]

Hello,

I'm experiencing exactly the same problem. The upgrade to kernel 5.8.x broke the ethernet on my Cubox-i, a completely fresh image with the same kernel had the same issue.

My solution for now was a clean install with kernel 5.7.15 (downgrading wasn't successful for me) and frozen kernel updates in armbian-config.