Chapter 4 System Support
4.2.7 PCI CONFIGURATION
PCI bus operations require the configuration of certain parameters such as PCI IRQ routing, DMA
channel configuration, RTC control, port decode ranges, and power management options. These
parameters are handled by the LPC I/F bridge function (PCI function #0, device 31) of the ICH2
component and configured through the PCI configuration space registers listed in Table 4-4.
Configuration is provided by BIOS at power-up but re-configurable by software.
Table 4-4. LPC Bridge Configuration Registers (ICH2, Function 0)
Table 4-4.
LPC Bridge Configuration Registers
(ICH2, Function 0, Device 31)
PCI
Config.
Addr.
Register
Reset
Value
PCI
Config.
Addr.
Register
Reset
Value
00, 01h Vendor ID 8086h 8Ah Device 31 Error Status 00h
02, 03h Device ID 2440h 90, 91h PCI DMA Configuration 0000h
04, 05h Command 000Fh A0-CFh Power Management
06, 07h Status 0280h D0-D3h General Control 0’s
08h Revision ID 00h D4-D7h General Status F00h
0A-0Bh Class Code 0106h D8h RTC Configuration 00h
0Eh Header Type 80h E0h LPC COM Port Dec. Range 00h
40-43h ACPI Base Address 1 E1h LPC FDD & LPT Dec. Rge 00h
44h ACPI Control 00h E2h LPC Audio Dec. Range 80h
4E, 4Fh BIOS Control 0000h E3h FWH Decode Enable FFh
54h TCO Control 00h E4, E5h LPC I/F Decode Range 1 0000h
58-5Bh GPIO Base Address 1 E6, E7h LPC I/F Enables 0000h
5Ch GPIO Control 00h E8-EBh FWH Select 1 00112233
60-63h INTA-D Routing Cntrl. 80h [1] EC, EDh LPC I/F Decode Range 2 0000h
64h Serial IRQ Control 10h EE, EFh FWH Select 2 5678h
68-6B INTE-F Routing Cntrl. 80h [1] F0h FWH Decode Enable 2 0Fh
88h Dev. 31 Error Config. 00h F2h Function Disable Register 00h
NOTE:
[1] Value for each byte.
Assume unmarked locations/gaps as reserved.
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition – March 2002
4-8
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