aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86_64
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/Kconfig5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 4b8326177c52..660a03a89e66 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -329,12 +329,15 @@ config HPET_EMULATE_RTC
329 329
330config GART_IOMMU 330config GART_IOMMU
331 bool "IOMMU support" 331 bool "IOMMU support"
332 default y
332 depends on PCI 333 depends on PCI
333 help 334 help
334 Support the K8 IOMMU. Needed to run systems with more than 4GB of memory 335 Support the IOMMU. Needed to run systems with more than 3GB of memory
335 properly with 32-bit PCI devices that do not support DAC (Double Address 336 properly with 32-bit PCI devices that do not support DAC (Double Address
336 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter. 337 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
337 Normally the kernel will take the right choice by itself. 338 Normally the kernel will take the right choice by itself.
339 This option includes a driver for the AMD Opteron/Athlon64 IOMMU
340 and a software emulation used on some other systems.
338 If unsure, say Y. 341 If unsure, say Y.
339 342
340# need this always enabled with GART_IOMMU for the VIA workaround 343# need this always enabled with GART_IOMMU for the VIA workaround