From c980cd911a8187206f2ab2f6fd67c86663e7f782 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 3 Jul 2008 19:35:06 +0200 Subject: [PATCH] --- yaml --- r: 99638 b: refs/heads/master c: 18d22200740b83a5d968d3236c27c310b3e8fda6 h: refs/heads/master v: v3 --- [refs] | 2 +- trunk/arch/x86/Kconfig | 10 +++++++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/[refs] b/[refs] index 81004fb3d682..514f9b320e1a 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 7441e9cb18a1a1e5b87f516fa97b6d4abb0838e3 +refs/heads/master: 18d22200740b83a5d968d3236c27c310b3e8fda6 diff --git a/trunk/arch/x86/Kconfig b/trunk/arch/x86/Kconfig index 8aae462f4e01..b120cffae1ee 100644 --- a/trunk/arch/x86/Kconfig +++ b/trunk/arch/x86/Kconfig @@ -554,7 +554,15 @@ config AMD_IOMMU select SWIOTLB depends on X86_64 && PCI && ACPI help - Select this to get support for AMD IOMMU hardware in your system. + With this option you can enable support for AMD IOMMU hardware in + your system. An IOMMU is a hardware component which provides + remapping of DMA memory accesses from devices. With an AMD IOMMU you + can isolate the the DMA memory of different devices and protect the + system from misbehaving device drivers or hardware. + + You can find out if your system has an AMD IOMMU if you look into + your BIOS for an option to enable it or if you have an IVRS ACPI + table. # need this always selected by IOMMU for the VIA workaround config SWIOTLB