Lanner HCP-72i1 User Manual page 67

Port 1A/1B/2A Link Speed: select "GEN1", "GEN2" or "GEN3" for the target link speed.
IOU2-PCIe Port: Functions visible based on the following options:
x4x4x4x4: functions 0/1/2/3 visible
x4x4x8: functions 0/2/3 visible
x8x4x4: functions 0/1/2 visible
x8x8: functions 0/2 visible
x16: function 0 visible
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