ram not detected in slot 2 - Pci express slot x16 does not work for x1 card - HiFive Unmatched - SiFive Forums tt888 slot

I tried two pci express x1 card in the x16 slot, neither was even detected the kernel, lspci showed nothing of course, it’s like two of them are not even power on. however both x1 cards work in desktop’s pci express x16 slots, plus, a x16 AMD GPU card works on unmatched board as well. both x1 cards are wifi cards but I don’t want to use the M.2 slot for that, question is, why did not the x1 work in x16 slot here? Looked at schematics and nothing suspicious to me either.

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It still says that the SPD in slot 4 is not detected. I have swapped the 2 rams between slots 2 and 4 and get the same result.