CerboGX: error messages in /var/log/messages

Q&A and troubleshooting
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1

Hi community,

I have a problem with my CerboGX, when I look in /var/log/messages I only see:

Jun 11 07:14:10 einstein kern.info kernel: [48416.969238] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48416.975275] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48416.980504] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48416.986425] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48416.991703] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48416.997631] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.002957] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.008814] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.014079] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.019977] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.025108] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.031040] sun4i-emac 1c0b000.ethernet eth0: ab : 8
Jun 11 07:14:10 einstein kern.info kernel: [48417.036202] sun4i-emac 1c0b000.ethernet eth0: ab : 9
Jun 11 07:14:10 einstein kern.info kernel: [48417.041843] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.046988] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.052714] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.057824] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.063355] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.068574] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.074109] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.079223] sun4i-emac 1c0b000.ethernet eth0: ab : 8
Jun 11 07:14:10 einstein kern.info kernel: [48417.085466] sun4i-emac 1c0b000.ethernet eth0: ab : 8
Jun 11 07:14:10 einstein kern.info kernel: [48417.091149] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.096556] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.101805] sun4i-emac 1c0b000.ethernet eth0: ab : 6
Jun 11 07:14:10 einstein kern.info kernel: [48417.107803] sun4i-emac 1c0b000.ethernet eth0: ab : 8
Jun 11 07:14:10 einstein kern.info kernel: [48417.113042] sun4i-emac 1c0b000.ethernet eth0: ab : 9
Jun 11 07:14:10 einstein kern.info kernel: [48417.119063] sun4i-emac 1c0b000.ethernet eth0: ab : 4
Jun 11 07:14:10 einstein kern.info kernel: [48417.124291] sun4i-emac 1c0b000.ethernet eth0: ab : 6

Basically this type of kernel info message is flooding my messages log file. Maybe someone knows what is the reason for that? The other thing what I noticed the Cerbo will not correctly reboot if the Ethernet cable is plugged in, the led is only fast flashing and the screen is stuck before the boot screen appears. I noticed that the watchdog is trying to restart the device, but I never noticed that it worked until I disconnect the ethernet cable.
When the Cerbo is running and booted up, I connect the ethernet cable and usually I need to try it 3-4 times bevor the fast flashing of the ethernet port stops and I get a IP address.

I have this behavior with version 3.55 and 3.60

Thanks for any hint

2

Have you loaded any modifications or customisations to the GX?

3

No modification, I run the “large” version with Node-Red enabled, but my only active flow is to send a “keepalive” so that the MQTT broker don’t stops publishing.

4

According to the kernel sources, “ab” stands for abort, in this case on transmitting – so my educated guess would be to try changing the cable and the switch on the other side of the cable and see if stuff gets more stable. Worst case, the GX’ ethernet hardware is defective.