Ethernet can not work on my custom carrier board with AGX Xavier

We design a custom carrier board ,in which we reference the NVIDIA carrier board and only keep three parts of the main functions:
1.HDMI Display port
2.PCIe (using a Kintex 7 series FPGA)
3.Ethnmet(same PHY: 88E1512)
By the way,SYS_VIN_MV(5V) and SYS_VIN_HV(12V) are not controled for power-on and power-down.
The issue is:after power on,the PCIe and HDMI all are work well,The Ethemet is established(LED0 light up!).
but ping always is timeout and cannot link it!

Please compare your dmesg between custom carrier and devkit.

417114548楼主,您好,我这用88E1512,也是不通,请问你的问题解决了没有

through read phy id,the result is 0xffffff-----,but change the phy to the other board,the phy work,why?

through read phy id,the result is 0xffffff-----,but change the phy to the other board,the phy work,why?