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Tool/software:
#1. What is the Strap pin of PCIE_GENERATION_SEL?
#2. How to select among GEN1/2/3 if only want to work in GEN1?
PCIE_GENERATION_SEL is set via CTRLMMR_PCIE0_CTRL [1:0] register.
Setting to 0b'00' should limit link negotiation to only Gen1