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-rw-r--r--Documentation/x86_64/boot-options.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index ab9b1c046c0..dbdcaf68e3e 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -179,7 +179,7 @@ PCI
IOMMU
iommu=[size][,noagp][,off][,force][,noforce][,leak][,memaper[=order]][,merge]
- [,forcesac][,fullflush][,nomerge][,noaperture]
+ [,forcesac][,fullflush][,nomerge][,noaperture][,calgary]
size set size of iommu (in bytes)
noagp don't initialize the AGP driver and use full aperture.
off don't use the IOMMU
@@ -200,6 +200,7 @@ IOMMU
buffering.
nodac Forbid DMA >4GB
panic Always panic when IOMMU overflows
+ calgary Use the Calgary IOMMU if it is available
swiotlb=pages[,force]