Compaq 108164-003 - ProLiant - 800 Integration Notes page 22

PCI Bus Numbering in a Microsoft Windows NT Environment
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
6th
7th
8th
th
9
10th
11th
*Bus number is different than previous configuration
13UK-1200A-WWEN
Slot PCI Bridge/
Number Controller
Type - Test 1
Primary Host to PCI
Bus (O) Bridge
Slot 1 Empty
Secondary
Host to PCI
Bus (2) Bridge
Slot 7 Empty
Slot 8 Empty
Tertiary Host to PCI
Bus (5) Bridge
Slot 6 NC3131
Slot 4 Empty
Slot 3 Empty
Slot 2 Empty
Slot 5 NC3132 (non-
bridged)
Bus Number Description of PCI BIOS Discovery
Assignment Process
The PCI BIOS discovers the Primary Bus
Bus 0 and assigns it bus 0.
Discovery process continues to PCI slot 1.
No PCI controller detected, no bus number
N/A
assigned.
The PCI BIOS discovers the Secondary
Bus 2
Bus and increments the bus number to 2.
Discovery process continues to PCI slots 7
and 8. No PCI controller detected, no bus
N/A
number assigned.
N/A
The PCI BIOS discovers the Tertiary Bus
Bus 5
and increments the bus number to 5.
Discovery process continues to PCI slot 6,
and detects a bridged NIC, incrementing
Bus 6
the bus number by one to become bus 6.
Discovery process continues to PCI slots
N/A
4, 3, and 2. No PCI controller detected, no
bus number assigned.
N/A
N/A
PCI BIOS detects a NIC (no PCI bridge) in
Bus 5
slot 5, it is assigned the same bus number
as the PCI Bus where it resides.
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