Intel® Core™ Ultra Processors for H-series and U-series Platforms CFG and MEM Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 795258 | 12/14/2023 | Public |
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Device 2 Control (DEV2CTL_0_2_0_PCI) – Offset 58
This register implements a control bit to disable and hide the IOBAR register in systems that do not require legacy IOBAR access to Gfx MMIO registers.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 7:6 | 0h | RO | Reserved |
| 5 | 1h | RO | ARI DISABLE (ARI_DIS) Disable ARI Extended Capability |
| 4:2 | 0h | RO | Reserved |
| 1 | 0h | RW | ATS DISABLE (ATS_DIS) Disable Address translation Extended Capability |
| 0 | 0h | RO | IO BAR Disable (IOBARDIS) System BIOS can choose to disable and hide the IOBAR for systems that do not require legacy IOBAR access to GFX MMIO registers. |