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Connection establishment from laptop to controller is not happeing (verified with ping)

Hi All,

I have used latest SDK(8.2.0.24) with kernel version 5.10.100  in this we are not able to ping from laptop to controller..

my architecture is laptop --> controller 

Task is to port from 4.9.59 kernel(sustom kernel) to 5.10.100

I am able to make the kernel up.. and we have used the KSZ8863 ethernet switch and can able to load the module.. while booting 

1 issue i am facing is i am not able to ping from laptop to controller(custom controller which is based on am335x.

Note: i have modified dts (am335x-evmsk.dts) i.e as below (5.10.100 kernel version)

&phy_gmii_sel {
rmii-clock-ext;
};

initialy it was because we wer using 4.9.59 kernel

&phy_sel {

 rmii-clock-ext;
};

will it be a problem while establishing connection? via ping?

am i missing any additional configurations..?

i debuged by wireshark and arp tool observed the arp is not able to reslove the ip.. may i know how resolve this..

Also 1 fundemnetal question: may i know who will be assigning ip for the controller?

please provide info at earliest..

Thank you