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From: Johann Obermayr <johann.obermayr@sigmatek.at>
Message-ID: <5614D22A.8030203@sigmatek.at>
Date: Wed, 7 Oct 2015 10:04:58 +0200
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Subject: Re: [Xenomai] Problems disabling SMI interrupts on MSI H87-G43
 motherboard
Reply-To: johann.obermayr@sigmatek.at
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Am 07.10.2015 um 09:25 schrieb Johann Obermayr:
> Am 06.10.2015 um 21:23 schrieb Gilles Chanteperdrix:
>> On Tue, Oct 06, 2015 at 12:03:55PM +0200, Anders Blomdell wrote:
>>> Hi
>>>
>>> I have problems disabling SMI-interrupts on "MSI H87-G43=20
>>> motherboard" (http://www.msi.com/product/mb/H87-G43.html)
>>>
>>> This is what msi.c says at bootup (after attached patch is applied):
>>>
>>>    kernel: [Xenomai] SMI workaround failed! (1830: 1 & ~1 -> 1)
>>>
>>> and this is what lspci says:
>>>
>>>
>>> Anybody who has a good idea how to fix this?
>> You should first check that the way smi.c retrieves the address of
>> the SMI_EN register is still valid for your chipset. If it is, then
>> try fiddling with the BIOS settings to see if some setting can
>> disable generation of SMIs. If unsuccessful, you can try contacting
>> the motherboard support to see if they have any advice.
>>
> On new Mainboards, you can't disable SMI.
> Because this is a security problem, so SMI is locked by BIOS.
> There are some registery on the mainboard chipset, hat lock the SMI=20
> register.
> So you can't disable the SMI.
> We also had this trouble, and we get a own BIOS with disabled SMI.
>
> Regards
>   Johann
>
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://xenomai.org/mailman/listinfo/xenomai
>
Found this:

GEN_PMCON_1=97General PM Configuration 1 Register (PM=97D31:F0)
Offset Address: A0h Attribute: R/W, RO, R/WO
Default Value: 0000h Size: 16-bit
Lockable: No Usage: ACPI, Legacy
Power Well: Core

Bit 4: SMI_LOCK =97 R/WO. When this bit is set, writes to the GLB_SMI_EN=20
bit (PMBASE
+ 30h, bit 0) will have no effect. Once the SMI_LOCK bit is set, writes=20
of 0 to
SMI_LOCK bit will have no effect (that is, once set, this bit can only=20
be cleared by
PLTRST#).

Regards
   Johann