RE: [suse-amd64] IOMMU
If I recall correctly, enabling IOMMU in the BIOS just makes the kernel's job easier in finding a hunk of MMIO space to place the Aperture. Providing you didn't disable IOMMU on the grub line, I believe Andi's code will still attempt to setup the Aperture and use it for IOMMU even if it is not getting hints from the BIOS. -Rich Brunner, AMD
-----Original Message----- From: John Craig [mailto:johncraig01@netscape.net] Sent: Friday, June 18, 2004 9:11 AM To: suse-amd64@suse.com Subject: [suse-amd64] IOMMU
This may seem like a dumb question, but should I enable IOMMU in the bios? This is a dual Opteron file server with a MSI K8D Master Mobo. I just noticed that it was disabled by default, and that it is used by Linux to translate 32-bit addresses to 64-bit addresses.
Thanks, John Craig
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On Fri, Jun 18, 2004 at 09:29:22AM -0700, Richard Brunner wrote:
If I recall correctly, enabling IOMMU in the BIOS just makes the kernel's job easier in finding a hunk of MMIO space to place the Aperture.
Providing you didn't disable IOMMU on the grub line, I believe Andi's code will still attempt to setup the Aperture and use it for IOMMU even if it is not getting hints from the BIOS.
It will, but it will allocate it over memory which costs you the memory (normally 64MB) It's only really needed anyways when you have more than ~3GB of memory. -Andi
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