[coreboot] Re: coreboot-4.8.1 ... mce errors

[Simon Newton]

Hi Angel,
Long time no speak. Hope you are well.
Sven is using 4.8.1 as its a Heads based installation.I see the patch went
in Sept 2018 which is a fair few months after 4.8.1. Ill port a heads build
with 4.11 for Sven (and myself, as I have the same issue) and see if that
resolves.

cheers
Simon

On Fri, 11 Jun 2021 at 11:06, Angel Pons  wrote:
> Hi Nico, Sven,
>
> On Fri, Jun 11, 2021 at 9:19 AM Nico Huber  wrote:
> > Hi Sven,
> >
> > On 11.06.21 00:55, Sven Semmler wrote:
> > > On my ThinkPad T430 running Coreboot-4.8.1 as part of an Heads install,
> > > I see these error messages when turning on the PC:
> > >
> > > mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank: 7: ee20000000
> > > 3110a
> > > mce: [Hardware Error]: TSC 0 ADDR fefe78c0 MISC 3880000086
> > > mce: [Hardware Error]: PROCESSOR 0:306a9 TIME 1622589409 SOCKET 0
> > > mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank: 8: ee20000000
> > > 3110a
> > > mce: [Hardware Error]: TSC 0 ADDR fefe7880 MISC 3880000086
> > > mce: [Hardware Error]: PROCESSOR 0:306a9 TIME 1622589409 SOCKET 0
> > > APIC 0 microcode 1f
> > >
> > > I do not think it is an issue with the actual RAM:
> >
> > Indeed, this is not about the actual (D)RAM. One can tell by the
> > address already, 0xfefe.... this is part of what we call I/O hole,
> > a region reserved from the memory address space for different purposes.
> >
> > More specifically, 0xfefe0000..0xfeffffff is a range used for cache-
> > as-ram (CAR) which is a mode where the processor cache is used as RAM
> > before the actual DRAM is available.
> >
> > I have seen these MCEs before, but never investigated. They might affect
> > the stability of coreboot, but it seems less likely that they affect the
> > running OS once the system succeeded to boot.
>
> They look a lot like what https://review.coreboot.org/28443 fixed. You
> could check if commit dfaff4d18a711f764c9198f488435fdc553dcea2 exists
> on 4.8.1 (if it does not, there's your problem).
>
> Also, have you considered using a more recent coreboot version? 4.8.1
> is over three years old, and the ThinkPad T430 is still supported on
> all newer releases (latest is 4.14).
> > Nico
>
> Best regards,
> Angel
> _______________________________________________
> coreboot mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]