MTRR test fail

[Alex Hung]

Hi Clifton,

CPU's Cache is complex. FWTS checks various places that is known to OS but
it seems that there are CPU registers FWTS is unable to check.

Especially, FWTS is not able to check CR0 register in Intel's CPU. This
register has a global switch for cache - CD & NW (see details @ Intel® 64
and IA-32 Architectures Software Developer’s Manual 3) or
https://github.com/seporaitis/xv6-public/wiki/CPU-Registers-CR0). If CD &
NW are correctly configured, you can ignore FWTS's MTRR error messages.

On Fri, Apr 27, 2018 at 2:17 AM, Clifton Lai <CliftonL at hyvesolutions.com>
wrote:

> Hi Fwts developers
>
>
>
> When running mtrr test via fwts-live 18.03.00, the result.log always shows
> “failed”.
>
> Here is output
>
> “FAILED [MEDIUM] MTRRIncorrectAttr: Test 1, Memory range 0xb5000000 to
> 0xb5ffffff
>
> (0000:3d:00.1) has incorrect attribute Uncached.”
>
>
>
> According to the wiki page, https://wiki.ubuntu.com/
> FirmwareTestSuite/Reference/mtrr,
>
> adding kernel parameter "enable_mtrr_cleanup" to run mtrr test again, it
> still fail the test.
>
>
>
> Is there any method to solve this issue?
>
>
>
> Thanks
>
>
>
> Best Regards
>
> Clifton
>
>
>
> CliftonL at hyvesolutions.com
>
> *[image: 1]*
>
>
>
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-- 
Cheers,
Alex Hung
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