AC82G41SLGQ3 Datasheet, PDF (288/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

Integrated Graphics Registers (Device 2) (Intel^® 82Q45, 82Q43, 82B43, 82G45, 82G43, 82G41
GMCH Only)
9.1.22
Note:
MGGC—GMCH Graphics Control Register
B/D/F/Type:
Address Offset:
Default Value:
Access:
Size:
0/2/0/PCI
52-53h
0030h
RO
16 bits
All the bits in this register are locked in Intel TXT mode (82Q45/82Q43 GMCH only).
Bit
15:12
11:8
Access
RO
RO
Default
Value
0h
0h
RST/
PWR
Description
Core
Core
Reserved
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.
GSM is assumed to be a contiguous physical DRAM space with DSM,
and BIOS needs to allocate a contiguous memory chunk. Hardware
will drive the base of GSM from DSM only using the GSM size
programmed in the register.
0000 = No memory pre-allocated.
0001 = No VT mode, 1 MB of memory pre-allocated for GTT.
0011 = No VT mode, 2 MB of memory pre-allocated for GTT
1001 = VT mode, 2 MB of memory pre-allocated for 1 MB of Global
GTT and 1 MB for Shadow GTT (82Q45, 82Q43 GMCH only)
1010 = VT mode, 3 MB of memory pre-allocated for 1.5 MB of Global
GTT and 1.5 MB for Shadow GTT (82Q45 GMCH only)
1011 VT mode, 4 MB of memory pre-allocated for 2 MB of Global
GTT and 2 MB for Shadow GTT (82Q45 GMCH only)
NOTE: All unspecified encodings of this register field are reserved,
hardware functionality is not assured if used. This register is
locked and becomes Read Only when the D_LCK bit in the
SMRAM register is set.
288
Datasheet