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DP83TC814R-Q1: How to debug a network port

Part Number: DP83TC814R-Q1

Tool/software:

We use a DP83TC814R-Q1, in the linux-4.19 kernel to shift your driver dp83tc812.c, we can identify the PHY id, but we can't connect with other devices with the ping command, we have tested the tx clk with an oscilloscope is 25M, the data line is a data signal, and the rx data cannot be received and the rx clk has no signal

We use RGMII + slave mode, but we found that the SGMII  + slave is set on the hardware, and we modified the mode according to your RTOS driver software

Still can't successfully ping the device, I would like to ask, can this rgmii mode only be modified by hardware?
Or is there any other direction that can help me get through the network port? Thanks a lot