On Thu, 26 Jun 2008 21:28:10 +0200
Joerg Roedel <joerg.roedel@amd.com> wrote:

quoted text
> Add documentation for the kernel parameters introduced with this driver.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> ---
>  Documentation/kernel-parameters.txt |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index e07c432..fc8f936 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -271,6 +271,18 @@ and is between 256 and 4096 characters. It is defined in the file
>  	aic79xx=	[HW,SCSI]
>  			See Documentation/scsi/aic79xx.txt.
>  
> +	amd_iommu=	[HW,X86-84]
> +			Pass parameters to the AMD IOMMU driver in the system.
> +			Possible values are:
> +			off     - disable the driver for AMD IOMMU
> +			isolate - enable device isolation (each device, as far
> +			          as possible, will get its own protection
> +			          domain)
> +	amd_iommu_size= [HW,X86-64]
> +			Define the size of the aperture for the AMD IOMMU
> +			driver. Possible values are:
> +			'32M', '64M' (default), '128M', '256M', '512M', '1G'
> +
>  	amijoy.map=	[HW,JOY] Amiga joystick support
>  			Map of devices attached to JOY0DAT and JOY1DAT
>  			Format: <a>,<b>

Documentation/x86_64/boot-options.txt would be a better place?

Probabaly, it would be better to clean up x86_64 IOMMU options.
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