How to extend a dGPU to JAO moudle?

HI,
I want to extend a external dGPU to JAO moudle, could you please tell hwo to inter connect? For example, I want to use UPHY2 working as a PCIe x8 mode? how to config the sideband signals?
Thanks!
Jason

Sorry to tell this is not not supported at Jetson plattform currently.

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