Hi Nico, Sven,

On Fri, Jun 11, 2021 at 9:19 AM Nico Huber <nico.h@gmx.de> 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
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