Jetson AGX Orin Dev Kit PCIe (Orin RP to Orin EP) Shared RAM Memory Not Working

I have followed the “PCIe Endpoint Mode” instructions from r35.3.1 Developer Guide. I have rebuilt the kernel to disable CONFIG_STRICT_DEVMEM. I can enable to EP Orin and rd/wr to the BAR0 RAM phys.

Although when I run “# setpci -s 0005:01:00.0 COMMAND=0x02” on RP Orin, I get the following message:

"setpci: Warning: No devices selected for “COMMAND=0x02” .

Furthermore, when I run “# lspci -v” it only shows 0001:00:00.0 PCI bridge: NVIDIA Corporation Device 229e (rev a1) (prog-if 00 [Normal decode]) and does not show any mention of “RAM memory: NVIDIA Corporation Device 0001”

Can this test be done using an x4 PCIe cable in the x16 slot?

Please advise!