Question about mtrr test

[Dong, Eric]

Hi Alex,

I don't use linux environment to do the test. So I don't have the /proc/mtrr and /proc/iomem info.

From Intel IA32 manual,  you can get the default memory type info from MSR  IA32_MTRR_DEF_TYPE. 

Thanks,
Eric
> -----Original Message-----
> From: Alex Hung [mailto:alex.hung at canonical.com]
> Sent: Thursday, July 14, 2016 7:59 PM
> To: Dong, Eric
> Cc: Colin Ian King; fwts-devel at lists.ubuntu.com
> Subject: Re: Question about mtrr test
> 
> 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