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MCU-PLUS-SDK-AM243X: CPSW malfunction

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: AM2432

Hi there,
We are facing communication problems with a network example from 
mcu_plus_sdk_am243x_08_05_00_24.

We are using a custom board based on AM2432 and the interested example is examples\networking\lwip\enet_lwip_cpsw.
After a cold restart, sometimes the board is able to manage incoming Ethernet messages (ARP, ICMP, …) .
After a cold restart, other times the board isn’t able to manage incoming Ethernet messages, in fact we notice that the LWIPIF_LWIP_input function is never called, so the packet is never passed to LwIP stack. The board seems to be unable to listen packets from the Ethernet and the only way to restore the correct functioning of the networking peripheral is to turn off and on the power supply of the board.

How can we fix this abnormal behavior of the network peripheral?.
Thanks.
Regards,
Matteo