Format of PCI Configuration data for Intel 82454KX/GX

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Offset	Size	Description
00h	64 BYTEs	header (see #00878) (vendor ID 8086h, device ID 84C4h)
40h	DWORD	top of system memory
44h	4 BYTEs	reserved
48h	BYTE	PCI decode mode
49h	BYTE	bridge device number
4Ah	BYTE	PCI bus number
4Bh	BYTE	PCI subordinate bus number
4Ch	BYTE	PB configuration
4Dh	4 BYTEs	reserved
51h	BYTE	deturbo counter control
52h	BYTE	reserved
53h	BYTE	CPU read/write control
54h	WORD	PCI read/write control
56h	BYTE	reserved
57h	BYTE	SMM Enable
58h	BYTE	video buffer area enable
59h	7 BYTEs	Programmable Attribute Map registers 0-6 (see #01118)
60h	16 BYTEs	reserved
70h	BYTE	Error Command
71h	BYTE	Error Status
72h	6 BYTEs	reserved
78h	WORD	memory gap range
7Ah	WORD	memory gap upper address
7Ch	DWORD	PCI frame buffer
80h	8 BYTEs	reserved
88h	DWORD	high memory gap start address
8Ch	DWORD	high memory gap end address
90h	8 BYTEs	reserved
98h	DWORD	(GX only) I/O Space Range 1
9Ch	BYTE	PCI reset
9Dh	3 BYTEs	reserved
A0h	DWORD	(GX only) I/O Space Range 2
A4h	DWORD	I/O APIC range
A8h	8 BYTEs	reserved
B0h	WORD	configuration values driven on reset
B2h	2 BYTEs	reserved
B4h	WORD	captured system configuration values (read-only)
B6h	2 BYTEs	reserved
B8h	DWORD	SMM range
BCh	BYTE	high BIOS register
BDh	3 BYTEs	reserved
C0h	DWORD	PB Extended Error Reporting Command
C4h	DWORD	PB Extended Error Reporting Status
C8h	DWORD	PB Retry Timers
CCh	52 BYTEs	reserved

See Also:

#00878