Nitrogen i.MX8MM Ethernet Issues

[nbutts]

I'm having a lot of issues with Ethernet working reliably on a Nitrogen i.MX8MM device. Sometimes I get a

MDIO write timeout

in the system log, otherwise the interface just goes down. I tried resetting the phy, but once Ethernet drops I have to remove power for several seconds and then reapply power. It will then work for a minute or so.

root@bionic-dev64:~# mii-tool -r eth0

restarting autonegotiation...

root@bionic-dev64:~# ifcon[   93.852651] fec 30be0000.ethernet eth0: MDIO write timeout

fig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.110.121  netmask 255.255.255.0  broadcast 192.168.110.255

        inet6 fe80::219:b8ff:fe06:af3b  prefixlen 64  scopeid 0x20<link>

        ether 00:19:b8:06:af:3b  txqueuelen 1000  (Ethernet)

        RX packets 152  bytes 17908 (17.9 KB)

        RX errors 33  dropped 0  overruns 0  frame 41

        TX packets 127  bytes 16411 (16.4 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I have Rx errors 

[gusarambula]

Hello Nick Butts,

The Nitrogen i.MX8MM is manufactured and supported by Boundary Devices. gary_bisson, would you have any suggestion of what may be the issue here?

Regards,

[gary_bisson]

Hi,

I'm no longer with Boundary Devices.

Please contact support@boundarydevices.com directly.

Regards,

Gary