diff options
Diffstat (limited to 'arch/x86_64/Kconfig')
| -rw-r--r-- | arch/x86_64/Kconfig | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 31bab721cb71..6420baeb8c1f 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -364,13 +364,15 @@ config GART_IOMMU select SWIOTLB depends on PCI help - 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 northbridge IOMMU - and a software emulation used on other systems. - If unsure, say Y. + 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. # need this always enabled with GART_IOMMU for the VIA workaround config SWIOTLB |