[Buildroot] Plug/unplug ethernet connector does not detected on Raspberry PI3 B+

[Oscar Gomez Fuente]

Hi Arnout,

>  You probably want ifplugd.

Yes, I was checking this one, but it didn't work properly (Sometimes works
and sometimes not).

I don't understand because If I am using the same defconfig file than in
the Raspberry Pi 3B (changing the config.txt file and changing the device
tree bcm2710-rpi-3-b-plus.dtb for bcm2710-rpi-3-b.dtb) everything works
fine without installing the ifplugd.

So, this is the reason I think there is something wrong with the driver
LAN9515 (Raspberry Pi 3B+).

It is not normal that with the same image, in the raspberry pi 3B, I can
see kernel messages of the plug/unplug events:

[   81.006823] smsc95xx 1-1.1:1.0 eth0: link down
[   83.455586] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa
0xC5E1
[   84.454778] smsc95xx 1-1.1:1.0 eth0: link down
[   87.080069] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa
0xC5E1

And with the Raspberry Pi 3B+, I cannot see this messages, so I think the
driver is not detecting these events and then the Raspberrypi is not able
to execute ifup/ifdown automatically.

Does anyone have any suggestion? I am stuck.

Oscar Gomez Fuente
TST Sistemas
www.tst-sistemas.es
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