Compaq ProLiant 1000 PCI Bus Numbering in a Microsoft Windows NT Environment - Page 45

PCI Bus Numbering in a Microsoft Windows NT Environment 45 the PCI controllers discovered on each bus. In this example, the controllers do not contain bridges. Therefore, they are assigned the same bus number as the bus on which they reside. Configuration A - Test 2 - Adding a Device The next example in Table 14 illustrates the PCI BIOS discovery and bus number assignment process in the same dual-peer PCI ProLiant 6500 server. However, the configuration changes slightly by adding a bridged PCI disk controller on the Primary Bus. Table 14. PCI BIOS bus detection in a ProLiant 6500 - after adding a bridged controller Bus Detection Order/ Controller Discovery 1st Slot Number Primary Bus (0) PCI Bridge/ Controller Type - Test 2 Host to PCI Bus Bridge 2nd Slot 1 Netelligent 10/100 TX (new device) 3rd Slot 2 SMART-2/P Drive Array 4th Secondary Host to PCI Bus Bus (1) Bridge 5th Slot 3 Empty 6th Slot 4 Netelligent 10/100 TX 7th Slot 5 Empty Slot 6 Empty 8th 9th Slot 7 Empty 10th Slot 8 Empty *Bus number is different than previous configuration Bus Number Assignment Bus 0 Bus 0 Bus 1* Bus 2* N/A Bus 2* N/A N/A N/A N/A Description of PCI BIOS Discovery Process The PCI BIOS discovers the Primary Bus and assigns it bus 0. PCI BIOS detects a NIC (no PCI bridge) in slot 1, it is assigned the same bus number as the PCI Bus where it resides, and is the first controller detected by the PCI BIOS. Discovery process continues to PCI slot 2. PCI BIOS detects a SMART-2 disk controller (PCI bridge device) in slot 2, it detects the PCI bridge on the controller and increments the bus number to 1. The PCI BIOS discovers the Secondary Bus and increments the bus number to 2. Changing the bus number assignment from the original configuration. Discovery process continues to PCI slot 3. No PCI controller detected, no bus number assigned. PCI BIOS detects a NIC (no PCI bridge) in slot 4, it takes the same bus number assignment as the Secondary PCI Bus where it resides, bus 2. Changing the bus number assignment from the original configuration. Discovery process continues to PCI slot 5. No PCI controller detected, no bus number assigned. Discovery process continues to PCI slot 6. No PCI controller detected, no bus number assigned. Discovery process continues to PCI slot 7. No PCI controller detected, no bus number assigned. Discovery process continues to PCI slot 8. No PCI controller detected, no bus number assigned. 13UK-1200A-WWEN