CONFIG_GART_IOMMU: Old AMD GART IOMMU support

General informations

The Linux kernel configuration item CONFIG_GART_IOMMU has multiple definitions:

Old AMD GART IOMMU support found in arch/x86/Kconfig

The configuration item CONFIG_GART_IOMMU:

• prompt: Old AMD GART IOMMU support
• type: bool
• depends on: CONFIG_X86_64 && CONFIG_PCI && CONFIG_AMD_NB
• defined in arch/x86/Kconfig
• found in Linux kernels: 3.13–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron GART based hardware IOMMUs.

The GART supports full DMA access for devices with 32-bit access limitations, on systems with more than 3 GB. This is usually needed for USB, sound, many IDE/SATA chipsets and some other devices.

Newer systems typically have a modern AMD IOMMU, supported via the AMD_IOMMU=y config option.

In normal configurations this driver is only active when needed: there's more than 3 GB of memory and the system contains a 32-bit limited device.

If unsure, say Y.

GART IOMMU support found in arch/x86/Kconfig

The configuration item CONFIG_GART_IOMMU:

• prompt: GART IOMMU support
• type: bool
• depends on: ( CONFIG_EXPERT ) && ( CONFIG_X86_64 && CONFIG_PCI && CONFIG_AMD_NB )
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.12

Help text

Support for full DMA access of devices with 32bit memory access only on systems with more than 3GB. This is usually needed for USB, sound, many IDE/SATA chipsets and some other devices. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART based hardware IOMMU and a software bounce buffer based IOMMU used on Intel systems and as fallback. The code is only active when needed (enough memory and limited device) unless IOMMU_DEBUG or iommu=force is specified too.

K8 GART IOMMU support found in arch/x86_64/Kconfig

The configuration item CONFIG_GART_IOMMU:

• prompt: K8 GART IOMMU support
• type: bool
• depends on: CONFIG_PCI
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.6.16–2.6.17

Help text

Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors and for the bounce buffering software IOMMU. Needed to run systems with more than 3GB of memory properly with 32-bit PCI devices that do not support DAC (Double Address Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter. Normally the kernel will take the right choice by itself. This option includes a driver for the AMD Opteron/Athlon64 IOMMU northbridge and a software emulation used on other systems without hardware IOMMU. If unsure, say Y.

IOMMU support found in arch/x86_64/Kconfig

The configuration item CONFIG_GART_IOMMU:

• prompt: IOMMU support
• type: bool
• depends on: CONFIG_PCI
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.15

Help text

Support the IOMMU. Needed to run systems with more than 3GB of memory properly with 32-bit PCI devices that do not support DAC (Double Address Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter. Normally the kernel will take the right choice by itself. This option includes a driver for the AMD Opteron/Athlon64 IOMMU and a software emulation used on some other systems. If unsure, say Y.

Hardware

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The data is retrived from:

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