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more insight into BIOS MTRRs (Users)

posted by RayeR(R) Homepage, CZ, 24.03.2011, 16:20

> That being said, if caching
> controls are set for a given location by more than once mechanism, the
> most restrictive (least amount of caching) policy specified wins.

Well. from what CPUID the PAT is supported and how can I check if CPU support pat? I guess that C2D support it. In my case MTRRLFBE sets only MTRRs but it works fine even with PAT not set or set by default. According to mentioned rule if PAT not set it shouldn't work MTRR setting but it worsk. But only on C2D and older. Does it mean that BIOS sets PAT but not set MTRR and on new core i3/5/7 it doesn't set neither MTRR nor PAT?

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DOS gives me freedom to unlimited HW access.

 

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