Question about mtrr test

[Alex Hung]

the FWTS version is V16.05.01 according to the attached file "fwts"

the fwts results (i.e. fwts") also listed the mtrr (probably from
/proc/mtrr) as below:

mtrr           ;INF Reg 0: 0x00000000c0000000 - 0x00000000ffffffff (
1024 MB)   Uncached
mtrr           ;INF Reg 1: 0x00000000bf800000 - 0x00000000bfffffff (
  8 MB)   Uncached

Everything before 0xC0000000 and after 0xbfffffff are not specified,
according to Linux kernel (ex. 4.5.0-yocto-standard).

As far as FWTS's concerns, it is the results look right...  Will you
be able to provide the ouput of the following?

1. cat /proc/mtrr
2. cat /proc/iomem

PS. In theory default cache mechanism can be read from CR0 register,
but I haven't figured out how to do it in FWTS as it can only be read
in ring0...

On Thu, Jul 14, 2016 at 6:44 PM, Dong, Eric <eric.dong at intel.com> wrote:
> Colin,
>
> Thanks for your quick response.
>
>> -----Original Message-----
>> From: Colin Ian King [mailto:colin.king at canonical.com]
>> Sent: Thursday, July 14, 2016 6:27 PM
>> To: Dong, Eric; fwts-devel at lists.ubuntu.com
>> Subject: Re: Question about mtrr test
>>
>> On 14/07/16 11:08, Dong, Eric wrote:
>> > I use LUV v2.1-rc1 image to do the test, not sure the Fwts version. I think it is Fwts V16.06.00.
>> >
>> >
>> >> -----Original Message-----
>> >> From: Colin Ian King [mailto:colin.king at canonical.com]
>> >> Sent: Thursday, July 14, 2016 6:00 PM
>> >> To: Dong, Eric; fwts-devel at lists.ubuntu.com
>> >> Subject: Re: Question about mtrr test
>> >>
>> >> On 14/07/16 10:58, Dong, Eric wrote:
>> >>> 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?
>>
>> OK, I think thats a bug, thanks for reporting that. I've filed it under:
>> https://bugs.launchpad.net/ubuntu/+source/fwts/+bug/1603026
>>
>> Any ideas Ivan/Alex?
>>
>> Colin
>> >>>
>> >>>
>> >>>
>> >>> Thanks,
>> >>>
>> >>> Eric
>> >>>
>> >>>
>> >>>
>> >>> This body part will be downloaded on demand.
>> >>>
>> >>
>> >> Eric, which version of fwts are you using?
>> >>
>> >
>
>
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-- 
Cheers,
Alex Hung