Compaq 108164-003 - ProLiant - 800 Integration Notes page 49

PCI Bus Numbering in a Microsoft Windows NT Environment
IMPORTANT: The controllers that Compaq added to the server configuration were selected
only to illustrate how bus renumbering occurs. Several different SMART Array and network
controllers were included to demonstrate that they all respond to renumbering in the same
manner. This is not meant to be a recommended configuration.
Test 2 in Table 16 illustrates how bus assignments change when physical configuration changes
occur in the server.
Table 16. Test 2 – PCI BIOS bus detection in the ProLiant 6000 and 7000 servers
Bus
Detection
Order/
Controller
Discovery
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
*Bus number is different than previous configuration.
13UK-1200A-WWEN
Slot PCI Bridge/
Number Controller
Type - Test 2
Primary Host to PCI
Bus (0) Bus bridge
Slot 1 N/A
(EISA)
Slot 2 N/A
(EISA)
Slot 3 Netelligent
10/100 TX
(new device)
Slot 4 SMART-2/P
Drive Array
(new device)
Slot 5 Netelligent
Dual
10/100 TX
Slot 6 SMART-2/SL
Drive Array
Secondary
Host to PCI
Bus (4) Bus bridge
Slot 7 Empty
Slot 8 SMART-2/SL
Drive Array
Slot 9 Empty
Slot 10 Netelligent
Dual
10/100 TX
Slot 11 Empty
Bus Number Description of PCI BIOS Discovery
Assignment Process
Bus 0 As with Test 1, the PCI BIOS assigns 0 to
the Primary Bus and continues
downstream with the controller discovery
N/A
process.
The NIC in slot 3 does not contain a PCI
N/A
bridge it assumes the bus number of the
bus where it resides, which in this case is
bus 0. It is the first network controller
detected by the PCI BIOS.
Bus 0
A PCI bridged Intelligent drive array
controller was ADDED to the server in slot
4. The PCI BIOS increments the PCI bus
number to 1 and assigns it to the bridge on
Bus 1*
the controller.
A PCI bridged NIC was ADDED to the
server in slot 5. The PCI BIOS increments
the PCI bus to 2 and assigns the bus
Bus 2*
number to the bridge on the controller. All
bus numbers assigned later in the
discovery from here are affected.
Intelligent drive array controller with a PCI
bridge detected in slot 6. The PCI BIOS
Bus 3*
increments the PCI number to bus 3 and
changes the assignment of the bus
number on the array controller.
The PCI BIOS discovers the Secondary
Bus 4*
Bus and assigns it bus 4, a changed
number.
N/A
Intelligent drive array controller with PCI
bridge detected in slot 8. The PCI BIOS
Bus 5*
increments the PCI bus number to 5
changing the bus number assignment on
the array controller.
Slot 9 is empty, no PCI bus number
N/A
assignment
NIC in slot 10 contains a PCI bridge and
Bus 6*
the PCI BIOS increments the bus number
to 6 changing the bus number assignment.
Slot 11 is empty, no PCI bus number
N/A
assignment.
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