HP A2Y15AV Manuel D’Utilisation

62

Datasheet, Volume 2

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 Host Bridge. There is no physical memory within this 4 KB window 
that can be addressed. The 4 KB reserved by this register does not alias to any PCI 2.3 
compliant memory mapped space. On reset, the Root Complex configuration space is 
disabled and must be enabled by writing a 1 to DMIBAREN [Device 0, offset 68h, bit 0]. 
All the bits in this register are locked in Intel TXT mode.

63:39

RO

0h

38:12

RW

0000000h

Uncore

DMI Base Address (DMIBAR) 
This field corresponds to bits 38:12 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 the first 512 GB of addressable memory space. 

System Software uses this base address to program the DMI 

register set. All the bits in this register are locked in Intel TXT 

mode.

11:1

RO

0h

0

RW

0b

Uncore

DMIBAR Enable (DMIBAREN)
0 = Disable. DMIBAR is disabled and does not claim any memory
1 = Enable. DMIBAR memory mapped accesses are claimed and 

decoded appropriately

This register is locked by Intel TXT.