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Technical Reference Guide
Compaq iPAQ Family of Internet Devices
First Edition - March 2000
4-7
4.2.5 PCI CONFIGURATION
PCI bus operations, especially those that involve ISA bus interaction, require the configuration of
certain parameters such as PCI IRQ routing, DMA channel configuration, RTC control, port
decode ranges, and firmware hub (FWH) access control. These parameters are handled by the
LPC I/F bridge function (PCI function #0, device 31) of the ICH component and configured
through the PCI configuration space registers listed in Table 4-3. Configuration is provided by
BIOS at power-up but re-configurable by software.
Table 4-3.
LPC Bridge Configuration Registers (ICH, Function 0)
Table 4-3.
LPC Bridge Configuration Registers
(ICH, Function 0, Device 31)
PCI Config.
Addr. Register
Reset
Value
PCI Config.
Addr. Register
Reset
Value
00, 01h Vender ID 8086h 88h Device 31 Error Config. 00h
02, 03h Device ID 2410h 8Ah Device 31 Error Status 00h
04, 05h Command 000Fh 90, 91h PCI DMA Configuration 0000h
06, 07h Status 0280h A0-CFh Power Management
08h Revision ID 00h D0-D3h General Control 0’s
09-0Bh Class Code 00h D4-D7h General Status F00h
0Eh Header Type 01h D8h RTC Configuration 00h
40-43hh ACPI Base Address 1 E1h COM Port Decode Range 00h
44h ACPI Control 00h E2h DD & LPT Port Dec. Range 00h
4E, 4Fh BIOS Control 0000h E3h FWH Decode Enable 80h
54h TCO Control 80h 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 E8h FWH Select
60-63h PCI IRQ Routing Cntrl. 80h EC, EDh LPC I/F Decode Range 2 0000h
64h Serial IRQ Control 10h F2, F3h Functions Disable 00
NOTE: Assume unmarked locations/gaps as reserved.