From ece668401250c1d0419ed078c1d26ccdd30d3289 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Sat, 30 Sep 2006 01:47:55 +0200 Subject: [PATCH] Allow disabling DAC using command line options Might or might not work around some reported bugs on VIA systems. Signed-off-by: Andi Kleen --- Documentation/x86_64/boot-options.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/x86_64') diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt index 4303e0c12476..e97a4c8fe6ea 100644 --- a/Documentation/x86_64/boot-options.txt +++ b/Documentation/x86_64/boot-options.txt @@ -199,6 +199,10 @@ IOMMU allowed overwrite iommu off workarounds for specific chipsets. soft Use software bounce buffering (default for Intel machines) noaperture Don't touch the aperture for AGP. + allowdac Allow DMA >4GB + When off all DMA over >4GB is forced through an IOMMU or bounce + buffering. + nodac Forbid DMA >4GB swiotlb=pages[,force] -- cgit v1.2.3-59-g8ed1b