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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