Using the PCIe slot of ROCKPro64 as EndPoint mode

[nonoriri]

Hello
If I modify the PCIe driver, can I use ROCKPro64 board in Endpoint mode?
For example, I would like to connect two ROCKPro64 boards as RC(Root complex) and EP(Endpoint).
I'm thinking of connecting with a PCIe extension cable (Male-to-Male).
The purpose is to study PCI Express.

Thanks for reading!