Intel D425 AU80610006252AA Manual De Usuario
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AU80610006252AA
Processor Configuration Registers
Datasheet
39
Bit Access Default
Value
RST/
PWR
Description
13:1 RO 0000h Core
Reserved ():
0 RW/L 0b Core
MCHBAR Enable (MCHBAREN):
0: MCHBAR is disabled and does not claim
any memory
1:
0: MCHBAR is disabled and does not claim
any memory
1:
MCHBAR memory mapped accesses are
claimed and decoded appropriately
1.5.14
GGC - GMCH Graphics Control Register
B/D/F/Type: 0/0/0/PCI
Address Offset:
52-53h
Default Value:
0030h
Access:
RO; RW/L;
Size: 16
bits
Bit Access Default
Value
RST/
PWR
Description
15:10 RO
00h Core
Reserved ():
9:8 RW/L 0h Core
GTT Graphics Memory Size (GGMS):
This field is used to select the amount of Main
Memory that is pre-allocated to support the
Internal Graphics Translation Table. The BIOS
ensures that memory is pre-allocated only
when Internal graphics is enabled.
00: No memory pre-allocated. GTT cycles
(Mem and IO) are not claimed.
01: MB of memory pre-allocated for GTT.
10: Reserved
11: Reserved
Note: This register is locked and becomes
Read Only when the D_LCK bit in the SMRAM
register is set.
This field is used to select the amount of Main
Memory that is pre-allocated to support the
Internal Graphics Translation Table. The BIOS
ensures that memory is pre-allocated only
when Internal graphics is enabled.
00: No memory pre-allocated. GTT cycles
(Mem and IO) are not claimed.
01: MB of memory pre-allocated for GTT.
10: Reserved
11: Reserved
Note: This register is locked and becomes
Read Only when the D_LCK bit in the SMRAM
register is set.
7:4 RW/L 0011b Core
Graphics Mode Select (GMS):
This field is used to select the amount of Main
Memory that is pre-allocated to support the
Internal Graphics device in VGA (non-linear)
and Native (linear) modes. The BIOS ensures
that memory is pre-allocated only when
Internal graphics is enabled.
0000: No memory pre-allocated. Device 2
(IGD) does not claim VGA cycles (Mem and
IO), and the Sub-Class Code field within
Device 2 function 0 Class Code register is 80.
0001: DVMT (UMA) mode, 1 MB of memory
pre-allocated for frame buffer.
0011: DVMT (UMA) mode, 8 MB of memory
pre-allocated for frame buffer.
This field is used to select the amount of Main
Memory that is pre-allocated to support the
Internal Graphics device in VGA (non-linear)
and Native (linear) modes. The BIOS ensures
that memory is pre-allocated only when
Internal graphics is enabled.
0000: No memory pre-allocated. Device 2
(IGD) does not claim VGA cycles (Mem and
IO), and the Sub-Class Code field within
Device 2 function 0 Class Code register is 80.
0001: DVMT (UMA) mode, 1 MB of memory
pre-allocated for frame buffer.
0011: DVMT (UMA) mode, 8 MB of memory
pre-allocated for frame buffer.