User`s guide

Installing Expansion Boards
8-5
2. The PCI bus is then scanned in this order:
PCI slots 1-4 are fixed to be on PCI bus 0, and are scanned
in ascending order. Each slot represents a different PCI
device number on PCI bus 0 as shown below:
Slot 1 PCI Bus 0, Device 6
Slot 2 PCI Bus 0, Device 7
Slot 3 PCI Bus 0, Device 8
Slot 4 PCI Bus 0, Device 9
For each controller found, the server scans to see if there
are any additional PCI busses on that controller. As PCI
busses are detected, they are assigned the next available
PCI bus number in sequence.
Controllers such as the Adaptec 2940W and the Mylex RAID
controllers (1, 2 or 3 channel), have no additional PCI
busses on board. They would represent a single device on
PCI bus 0 if installed in PCI slots 1-4.
In the case of the Adaptec 3940W, there is one additional
PCI bus onboard with two SCSI channels. If the 3940W
controller is installed in slot 1 of PCI bus 0, then the PCI bus
on the 3940W would be assigned as PCI bus 1, the two
SCSI channels on that controller would be seen as devices
on PCI bus 1.
Once all the controllers on PCI bus 0 (slots 1-4) have been
scanned, the secondary PCI bus is scanned (slots 5-8). This
PCI bus is assigned the next available bus number. Thus the
slot assignments would be:
Slot 5 PCI Bus N+1, Device 1
Slot 6 PCI Bus N+1, Device 2
Slot 7 PCI Bus N+1, Device 3
Slot 8 PCI Bus N+1, Device 4
Where N is the last PCI bus number assigned.