Why does the PCIe core send Unsupported Request completion message to my first good MRD request?

Description

If bit 1 of the PCI® Command Register (Memory Space Access Enable) in the Configuration Space is not set,
the PCIe core responds to the first good MRd request with a Completion with Unsupported Request status.

To fix this issue, please set Memory Space Access Enable bit of the PCIe Command Register to one.

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