Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 364

10.1.3 RPFN—Root Port Function Number and Hide for PCI
Express* Root Ports
Offset Address: 0404–0407h
Default Value:
For the PCI Express root ports, the assignment of a function number to a root port is
not fixed. BIOS may re-assign the function numbers on a port by port basis. This
capability will allow BIOS to disable/hide any root port and still have functions 0 thru N-
1 where N is the total number of enabled root ports.
Port numbers will remain fixed to a physical root port.
The existing root port Function Disable registers operate on physical ports (not
functions).
Port Configuration (1x4, 4x1, etc.) is not affected by the logical function number
assignment and is associated with physical ports.
Bit
31
30:28
27
26:24
23
22:20
19
18:16
15
14:12
11
364
76543210h
Root Port 8 Config Hide (RP8CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Root Port 8 Function Number (RP8FN) — R/WO. These bits set the function
number for PCI Express Root Port 8. This root port function number must be a
unique value from the other root port function numbers
Root Port 7 Config Hide (RP7CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Root Port 7 Function Number (RP7FN) — R/WO. These bits set the function
number for PCI Express Root Port 7. This root port function number must be a
unique value from the other root port function numbers
Root Port 6 Config Hide (RP6CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Root Port 6 Function Number (RP6FN) — R/WO. These bits set the function
number for PCI Express Root Port 6. This root port function number must be a
unique value from the other root port function numbers
Root Port 5 Config Hide (RP5CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Root Port 5 Function Number (RP5FN) — R/WO. These bits set the function
number for PCI Express Root Port 5. This root port function number must be a
unique value from the other root port function numbers
Root Port 4 Config Hide (RP4CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Root Port 4 Function Number (RP4FN) — R/WO. These bits set the function
number for PCI Express Root Port 4. This root port function number must be a
unique value from the other root port function numbers
Root Port 3 Config Hide (RP3CH) — R/W. This bit is used to hide the root port
and any devices behind it from being discovered by the OS. When set to 1, the root
port will not claim any downstream configuration transactions.
Chipset Configuration Registers
Attribute: R/WO, RO
Size: 32-bit
Description
Datasheet