From: "Andi Kleen" <ak@suse.de> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> --- arch/x86_64/Kconfig | 5 ++++- 1 files changed, 4 insertions(+), 1 deletion(-) diff -puN arch/x86_64/Kconfig~x86_64-improve-config_gart_iommu-description-and-make-it-default-y arch/x86_64/Kconfig --- devel/arch/x86_64/Kconfig~x86_64-improve-config_gart_iommu-description-and-make-it-default-y 2005-07-27 12:36:17.000000000 -0700 +++ devel-akpm/arch/x86_64/Kconfig 2005-07-27 12:36:17.000000000 -0700 @@ -329,12 +329,15 @@ config HPET_EMULATE_RTC config GART_IOMMU bool "IOMMU support" + default y depends on PCI help - Support the K8 IOMMU. Needed to run systems with more than 4GB of memory + 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. # need this always enabled with GART_IOMMU for the VIA workaround _