HP ROM-Based Setup Utility - Manual (Page 110)

PCI Bus Padding Options
This option allows the user to disable the default PCI Bus padding where each expansion slot is
provided with an extra PCI Bus number. By default, the System ROM pads bus numbers for slots
such that adding expansion cards does not affect the bus numbering of devices in the system.
Disabling this option works around issues with certain expansion cards.
HP recommends disabling this option only when you encounter a specific issue.
Options include:
•
Enabled (default)
•
Disabled
110 RBSU menu-driven interface, version 3.xx or later (G6, G7, and Gen8 servers)