@george Looks like only PCIe1 can be set to EP mode, the SSD PCIe3 cant.

And I tried your method, still can't find "/sys/class/pci_ep" device, we have to switch to Nvidia Platform....; Or, do you have other ideas? Thanks.

@george Can we disable the RC clock (by remove the Clock-Chip on PCB) and turn it into EP mode? I guess this will disable the PCIe-Eth too, but I can accept that. Thanks.

Cannot set the system to PCIe EndPoint mode, how? the RK3588 support PCIe EndPoint Mode.