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-rw-r--r--arch/x86_64/Kconfig16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 31bab721cb7..6420baeb8c1 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