I get the following errors when an Ethernet cable is connected to the BeagleV. these errors only show up on serial console and not on an ssh login.
[ 2619.718130] rtc-ds1307 2-0068: write error -121
[ 2619.723232] rtc-ds1307 2-0068: read error -121
if the Ethernet cable is not connected at boot time the errors do not show up until the Ethernet cable is connected. basically making the serial console unusable.
Edit #1
printk loglevel is set to 7 by default
“cat /proc/sys/kernel/printk”
to suppress these read/write errors, i’ve added “loglevel=3” to the end of the “append root” line in “/boot/extlinux/extlinux.conf” file.
ya can read more about loglevel at “Documentation/admin-guide/kernel-parameters.txt” in the linux source