x86 gart: rename CONFIG_IOMMU to CONFIG_GART_IOMMU

[mv-sheeva.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8157417724a86d3d765abc309eb7dcec4771e4e7..8ae5fac08dfa54087880678867698aea3bea96b9 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -422,7 +422,8 @@ and is between 256 and 4096 characters. It is defined in the file
        hpet=           [X86-32,HPET] option to control HPET usage
                        Format: { enable (default) | disable | force }
                        disable: disable HPET and use PIT instead
-                       force: allow force enabled of undocumented chips (ICH4, VIA)
+                       force: allow force enabled of undocumented chips (ICH4,
+                       VIA, nVidia)
 
        com20020=       [HW,NET] ARCnet - COM20020 chipset
                        Format:
@@ -781,6 +782,13 @@ and is between 256 and 4096 characters. It is defined in the file
                        bypassed by not enabling DMAR with this option. In
                        this case, gfx device will use physical address for
                        DMA.
+               forcedac [x86_64]
+                       With this option iommu will not optimize to look
+                       for io virtual address below 32 bit forcing dual
+                       address cycle on pci bus for cards supporting greater
+                       than 32 bit addressing. The default is to look
+                       for translation below 32 bit and if not available
+                       then look in the higher range.
 
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in
@@ -1436,7 +1444,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        Param: "schedule" - profile schedule points.
                        Param: <number> - step/bucket size as a power of 2 for
                                statistical time based profiling.
-                       Param: "sleep" - profile D-state sleeping (millisecs)
+                       Param: "sleep" - profile D-state sleeping (millisecs).
+                               Requires CONFIG_SCHEDSTATS
                        Param: "kvm" - profile VM exits.
 
        processor.max_cstate=   [HW,ACPI]