Can The Jetson Xavier NX be cofigured as Pcie Endpoint in x1 Mode?

I have a question, I saw in design guide, the Jetson Xavier NX brings two PCIe interfaces, include PCIE #0 and PCIE #1, I want to know if the PCIE #0(x4) or PCIE #1(x1) can work as endpoint in x1 mode?
Becaus the Root Port is zynq (work in x1 mode), if the NX can’t work as endpoint in x1 mode, the communition between zynq and NX is a big problem!
Please give me some guidance on the above mentioned issue.

Sorry for the late response, I wil have intenral team to confirm this.

Is there any conclusion for my question? I really want you can provide detailed guidance.

As mentioned in the documentation, PCIe #0 (x4) can be used as EP. It can also work as x1 in the EP mode.

We refer NVIDIA Jetson Linux Developer Guide : Jetson AGX Xavier PCIe Endpoint Mode | NVIDIA Docs, but in /sys/kernel/config/pci_ep/controllers we can’t find any files, do you know the reason