ETHERNET-SW: TDA4VH Ethfw can't receive ethernet data from lidar

Dear TI experts,

• Problem Description

Currently the TDA4VH can receive UDP data from packETH on the PC, but cannot receive Ethernet data from our lidar.

• Basic Info

Sw veision：ti-processor-sdk-rtos-j784s4-evm-08_06_00_14

Hw version：TDA4VH Original Demo board

Sw change：only change from DHCP to static IP mode. The changes are as follows：

                      Before change: 

                          #define ETHAPP_LWIP_USE_DHCP            (1)

                          #if !ETHAPP_LWIP_USE_DHCP

                          #define ETHFW_SERVER_IPADDR(addr)       IP4_ADDR((addr), 192,168,1,200)

                          #define ETHFW_SERVER_GW(addr)           IP4_ADDR((addr), 192,168,1,1)

                      After change:

                         #define ETHAPP_LWIP_USE_DHCP            (0)

                         #if !ETHAPP_LWIP_USE_DHCP

                         #define ETHFW_SERVER_IPADDR(addr)       IP4_ADDR((addr), 172,23,37,10)

                         #define ETHFW_SERVER_GW(addr)           IP4_ADDR((addr), 172,23,37,19)

• Analyze step

step1:  The wireshark on the PC parse the ethernet data from radar, as shown below.

            Dest MAC（PC side): 64:51:06:A1:91:7B     source MAC(lidar side)：70:b3:d5:99:d0:c3

            Dest IP：172.23.37.10                                   source IP: 172.23.37.11 each UDP packet total length1074 bytes, include user data length 1032 bytes

            Dest port 8888                                               source port 65535

step 2: packETH simulates lidar to send data to the board. First input ifconfig command to obtain MAC information of the network port on the board. eth2 MAC address                  70:FF:76:1D:92:C1. eth3 MAC address 70:FF:76:1D:92:C2. Then debug to find that BufPool globalTable in the SDK is able to accept data, and the packETH                        configuration is as screenshot below.

 Dest MAC（PC side): 70:FF:76:1D:92:C2     source MAC(lidar side)：70:b3:d5:99:d0:c3

 Dest IP：172.23.37.10                                   source IP: 172.23.37.11 each UDP packet total length1074 bytes, include user data length 1032 bytes

 Dest port 8888                                               source port 65535

step3: When the board is connected to the radar, I found that the board can't not receive Ethernet data during debugging.

• Test issue

Q1: The configuration of UDP data sending in Step 2 and Step 3 is basically the same. Why can Step 2 receive data but Step 3 cannot?

Q2: In step 2, why can the board receive data only if the destination MAC is 70:FF:76:1D:92:C2? If the destination MAC is others such as 70:FF:76:1D:92:C1, the board cannot receive data.