Eth0 does not always appear & requires a power cycle if not present

Legato Linux distribution (Yocto project)
1

I have a MangOH yellow board with a talon ethernet board plugged into the IoT connector.
Most of the time this works fine. Occasionally it forgets that it has an ethernet connection. When this happens, the only way I have found to get it to work again is to power cycle the MangOH.
Are there any better solutions to this problem?

2

Could it be some IOT card hardware connection problem?

Is that there is a reset pin on the board?

3

Thanks for the prompt reply.
The board appears to have connections to the following IoT pins:
2: USB-D+
3: USB-D-
4/21/30/38: Gnd
11: Vcc 1v8 ULPM
22: SDA
23: SCL
28/29: 3v3
31: Card Detect
32: Reset

The shell script from the link would run to the lines
if [[ ! -d /sys/class/net/${ITF_LAN} ]]; then
echo “Bring up LAN interface $ITF_LAN”
/sbin/ifup $ITF_LAN
if [ “$?” -ne 0 ]; then
echo “Bring up LAN interface $ITF_LAN failed”
exit 1
fi
fi

Where is would exit with:
ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCSIFADDR: No such device

Dave.

4

how about re-insert the IOT card?
How about toggling the reset pin?