Question about mtrr test

[Dong, Eric]

Hi,

I use Fwts to test the uefi bios, it reported below errors:

mtrr           ;HED mtrr: MTRR tests.
mtrr           ;SEP ------------------------------------------------------------
mtrr           ;INF MTRR overview
mtrr           ;INF -------------
mtrr           ;INF Reg 0: 0x00000000c0000000 - 0x0000000100000000 (  1024 MB)   Uncached
mtrr           ;INF Reg 1: 0x00000000bf800000 - 0x00000000c0000000 (     8 MB)   Uncached
mtrr           ;NLN
mtrr           ;INF Test 1 of 3: Validate the kernel MTRR IOMEM setup.
mtrr           ;FAL FAILED [MEDIUM] MTRRIncorrectAttr: Test 1, Memory range
mtrr           ;FAL 0x1000 to 0x5efff (System RAM) has incorrect attribute
mtrr           ;FAL Default (Most probably Uncached).
mtrr           ;FAL FAILED [MEDIUM] MTRRLackingAttr: Test 1, Memory range 0x1000
mtrr           ;FAL to 0x5efff (System RAM) is lacking attribute Write-Back.

But we already update the IA32_MTRR_DEF_TYPE (0x2FF) to set the default type to Write-Back. If update the IA32_MTRR_DEF_TYPE to set the default type to Uncached.  These errors will not occur. I think this is Fwts tools issue. It should check the default type from IA32_MTRR_DEF_TYPE before run this test.  Any feedback about it?

Thanks,
Eric
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