Intel B940 Ficha Técnica Página 52

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Processor Configuration Registers
52 Datasheet, Volume 2
2.7.12 MCHBAR—MCH Memory Mapped Register Range Base
Register
This is the base address for the processor memory mapped configuration space. There
is no physical memory within this 16 KB window that can be addressed. The 16 KB
reserved by this register does not alias to any PCI 2.3 compliant memory mapped
space. On reset, the processor MMIO memory mapped configuation space is disabled
and must be enabled by writing a 1 to MCHBAREN [Device 0, offset48h, bit 0].
All the bits in this register are locked in Intel TXT mode.
The register space contains memory control, initialization, timing, and buffer strength
registers — clocking registers and power and thermal management registers. The
16 KB space reserved by the MCHBAR register is not accessible during Intel TXT mode
of operation or if the ME security lock is asserted (MESMLCK.ME_SM_lock at PCI device
0, function 0, offset F4h) except for the following offset ranges.
02B8h to 02BFh: Channel 0 Throttle Counter Status Registers
06B8h to 06BFh: Channel 1 Throttle Counter Status Registers
0CD0h to 0CFFh: Thermal Sensor Control Registers
3000h to 3FFFh: Unlocked registers for future expansion
B/D/F/Type: 0/0/0/PCI
Address Offset: 48–4Fh
Reset Value: 0000_0000_0000_0000h
Access: RW-L, RO
Bit Attr
Reset
Value
Description
63:36 RO 0000000h Reserved
35:14 RW-L 000000h
MCH Memory Mapped Base Address (MCHBAR)
This field corresponds to bits 35:4 of the base address processor memory
mapped configuration space. BIOS will program this register resulting in a
base address for a 16 KB block of contiguous memory address space. This
register ensures that a naturally aligned 16 KB space is allocated within the
first 64 GB of addressable memory space. System Software uses this base
address to program the processor memory mapped register set. All the bits
in this register are locked in Intel TXT mode.
13:1 RO 0000h Reserved
0RW-L 0b
MCHBAR Enable (MCHBAREN)
0 = Disable. MCHBAR is disabled and does not claim any memory
1 = Enable. MCHBAR memory mapped accesses are claimed and decoded
appropriately
This register is locked by Intel TXT.
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1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 359 360

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