From: James Olin Oden james.oden@gmail.com

Any idea what the BIOS actually does to enable "linux" memory mode? That is what registers are poked in the MCH (I assume it would be the MCH)? Do you think this could be done post bios by say a boot loader?

It completely _breaks_ Intel GTL compatibility at the APIC level IIRC. You can _not_ run Windows on it or a "normal" Linux kernel.

From: Feizhou feizhou@graffiti.net

http://marc.theaimsgroup.com/?l=linux-kernel&m=107759901509280&w=2 The Linux option in bios is mentioned here. http://marc.theaimsgroup.com/?l=linux-kernel&m=107757492125437&w=2 I think what Bryan here is talking about is called IOMMU by the kernel guys.

No, that was already at the bottom of the link I sent before.

I was referring to _another_ thread where a gentlemen from AMD (with an amd.com address) was talking about the hack that enables this. It is a little known feature because only 2-3 mainboards have the BIOS hack as an option.

-- Bryan J. Smith mailto:b.j.smith@ieee.org