Intel® Core™ Ultra 200H and 200U Series Processors CFG and MEM Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 844345 | 01/29/2025 | 001 | Public |
PCI Mirror of GMCH Graphics Control (MGGC0_0_2_0_PCI) – Offset 50
Mirror of GGC register from GTTMMADR Space at offset 0x108040.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 15:8 | 5h | RO/V | Graphics Memory Size (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. It corresponds to DSM (Data Stolen Memory region) region. The BIOS ensures that memory is pre-allocated only when Internal graphics is enabled. Hardware does not clear or set any of these bits automatically based on IGD being disabled/enabled. BIOS Requirement: BIOS must not set this field to 0h if IVD (bit 1 of this register) is 0. BIOS Requirement: Given new sizes allow down to 8MB allocation, BIOS has to ensure there is sufficient space for WOPCM and basic GFX Stolen functions. |
| 7:6 | 0h | RO/V | Graphics Translation Table Memory Size (GGMS) Mirrored fromGTTMMADR Space offset 0x108040.This field is used to select the amount of Main Memory that is pre-allocated to support the Graphics Translation Table.0x0:No Preallocated Memory0x1:2MB of Preallocated Memory0x2:4MB of Preallocated Memory0x3:8MB of Preallocated Memory |
| 5:3 | 0h | RO | Reserved |
| 2 | 0h | RO/V | Versatile Acceleration Mode Enable (VAMEN) Enables the use of the iGFX engines for Versatile Acceleration. |
| 1 | 0h | RO/V | IVD (IVD) 0: Enable. Device 2 (IGD) claims VGA memory and IO cycles |
| 0 | 0h | RO | Reserved |