On Tue, 2 Oct 2007 21:34:13 -0400 Jeff Garzik wrote: > > Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]> > --- > After having to go figure out what some of these means, I figured I > would save others the trouble. > > Some of these are "best guess" based on a quick scan of the code, so it > certainly needs a sanity review before going upstream.
"iommu" is listed in Documentation/x86_64/boot-options.txt along with more x86_64-specific boot options. A few other arches do something similar... > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index 4d175c7..8afea9b 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -763,6 +763,30 @@ and is between 256 and 4096 characters. It is defined in > the file > > inttest= [IA64] > > + iommu=option[,option..] [X86-64] > + off Disable IOMMU. > + force Unconditionally enable IOMMU. > + noforce Disable IOMMU and IOMMU merging, by default. > + biomerge Unconditionally enable IOMMU, IOMMU merging, > + and set BIO IOMMU vmerge boundary to 4096. > + panic Panic on IOMMU overflow. > + nopanic Do not panic on IOMMU overflow. > + merge Unconditionally enable IOMMU, IOMMU merging. > + nomerge Disable IOMMU merging. > + forcesac Force single address cycle (SAC, 32-bit). > + allowdac Permit dual address cycle (DAC, 64-bit). > + nodac Forbid dual address cycle (DAC, 64-bit). > + soft Enable swiotlb. > + calgary Use Calgary IOMMU. > + > + (GART-only options follow...) > + <NNN> Specify size of remapping area. > + fullflush Disable optimizing flushing strategy. > + nofullflush Enable optimizing flushing strategy. > + noagp Use entire aperture, AGP isn't using it. > + noaperture Disable aperture fixups / hole init. > + memaper=<N> malloc an aperture of order N. > + > io7= [HW] IO7 for Marvel based alpha systems > See comment before marvel_specify_io7 in > arch/alpha/kernel/core_marvel.c. > - --- ~Randy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
