Compaq ProLiant 1000 PCI Bus Numbering in a Microsoft Windows NT Environment - Page 22

PCI Bus Numbering in a Microsoft Windows NT Environment 22 Configuration A - Test 2 - Adding a Device The example in Table 7 illustrates the PCI BIOS discovery and bus number assignment process in the same ProLiant ML530 server. However, the configuration changes slightly by adding a bridged PCI network controller on the Tertiary Bus. Table 7. PCI BIOS bus detection in a ProLiant ML530-after adding a bridged controller Bus Detection Order/ Controller Discovery 1st 2nd 3rd 4th 5th Slot Number PCI Bridge/ Controller Type - Test 1 Bus Number Assignment Primary Bus (O) Slot 1 Secondary Bus (2) Slot 7 Slot 8 Host to PCI Bridge Empty Host to PCI Bridge Empty Empty Bus 0 N/A Bus 2 N/A N/A Description of PCI BIOS Discovery Process The PCI BIOS discovers the Primary Bus and assigns it bus 0. Discovery process continues to PCI slot 1. No PCI controller detected, no bus number assigned. The PCI BIOS discovers the Secondary Bus and increments the bus number to 2. Discovery process continues to PCI slots 7 and 8. No PCI controller detected, no bus number assigned. 6th Tertiary Host to PCI Bus 5 Bus (5) Bridge 7th Slot 6 NC3131 Bus 6 8th Slot 4 Empty N/A 9th Slot 3 Empty N/A The PCI BIOS discovers the Tertiary Bus and increments the bus number to 5. Discovery process continues to PCI slot 6, and detects a bridged NIC, incrementing the bus number by one to become bus 6. Discovery process continues to PCI slots 4, 3, and 2. No PCI controller detected, no bus number assigned. 10th Slot 2 Empty N/A 11th Slot 5 NC3132 (non- Bus 5 bridged) *Bus number is different than previous configuration PCI BIOS detects a NIC (no PCI bridge) in slot 5, it is assigned the same bus number as the PCI Bus where it resides. 13UK-1200A-WWEN