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Host Bridge/DRAM Controller Registers (D0:F0)

Datasheet

4.1.15

DMIBAR—Root Complex Register Range Base Address

(D0:F0)

PCI Device:

Address Offset:

4Ch

Default Value:

00000000h

Access:

R/W

Size:

32 bits

This is the base address for the Root Complex configuration space. This window of addresses

contains the Root Complex Register set for the PCI Express hierarchy associated with the

(G)MCH. There is no physical memory within this 4-KB window that can be addressed. The

4 KB that is reserved by this register does not alias to any PCI 2.3 compliant memory mapped

space.

On reset, this register is disabled and must be enabled by writing a 1 to the DMIBAREN [Dev 0,

offset 54h, bit 29].

Bit

Access &

Default

Description

31:12

R/W

0000 0h

DMI Base Address: This field corresponds to bits 31 to 12 of the base address

DMI configuration space.

BIOS will program this register resulting in a base address for a 4-KB block of

contiguous memory address space. This register ensures that a naturally

aligned 4-KB space is allocated within total addressable memory space of

4 GB.

System software uses this base address to program the DMI register set.

11:0

Reserved

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