em… the board is actually a clone from from @Semi , who is generous enough to share us his hardwork from another thread and on altium.
For a better reference, I would hereattach the dts I’ve used which could successfully load both of the PCIe slots.
rk3588-rock-5b.zip (5.1 KB)
It is compiled under Kernel version 5.10.110.
I am currently working on the 10Gbps NIC… after that I would upload an image for this set up