[coreboot] KGPE-D16 / Problem booting with two CPUs

[Elisenda Cuadros]

Finally I acquired another 6276 CPU (it was the fastest and cheapest
option).

It works perfect.

If I can try (in the future) another different 16-core CPU, I will
report the result.

Thank you for you kind support.

Regards,

- Eli

On 11/04/18 21:30, Timothy Pearson wrote:
> This may be a general coreboot limitation at the moment.  The
> compatibility sections for mixed CPUs in the BKDG are more concerned
> with total power delivery and proper P-state setup than anything else.
>
> If I recall correctly, coreboot assumes both CPUs have the same core
> count when setting up APICs and such.  There are a number of places that
> would need to be modified to remove this assumption; it's a leftover
> from the original K8 code and would take some significant work to fix.
> This also needs to be verified as I am going from memory here from a
> couple of years ago.
>
> On 04/11/2018 02:12 PM, Elisenda Cuadros wrote:
> > Thank you for your reply Timothy.
>
> > Vendor Bios doesn't print any special message regarding this.
>
> > In fact it shows a total of 28 cores (16+12).
>
> > I thought mixing CPUs from same families was supported.
>
> > Regards,
>
> > - Eli
>
> > On 11/04/18 20:44, Timothy Pearson wrote:
> >> I don't know if coreboot has support for differing CPUs in the same
> >> mainboard; it's not something I can recall testing at any point.
> >>
> >> The failure is occurring far before memory initialization, in CAR, in
> >> core setup.  I'd guess it has something to do with the two CPUs you
> have
> >> installed having different core counts.
> >>
> >> Does the vendor BIOS print a message about the core count being limited
> >> on one of the CPUs for compatibility reasons?
> >>
> >> On 04/11/2018 12:57 PM, Elisenda Cuadros wrote:
> >>> Hello,
> >>
> >>> After testing the board for some weeks I bought another CPU (6276). I
> >>> installed this into CPU1 slot and a 6238 in CPU2.
> >>
> >>> I checked that both CPUs are shining and also the memory (Micron
> >>> MT18JSF25672PDZ-1G4F1DD, populated in A2/C2/E2/G2 slots).
> >>
> >>> The problem is that Coreboot seems to hang at the beginning. I attach
> >>> console.log.
> >>
> >>> I reinstalled all the devices twice, checked the vendor manual,
> docs in
> >>> coreboot.org, messages in mailing list, but I don't know what is
> causing
> >>> the problem.
> >>
> >>> Last test I've done is booting with vendor bios, and it boots without
> >>> problem.
> >>
> >>> Any ideas?
> >>
> >>> Thank you for your help.
> >>
> >>> Regards,
> >>
> >>> - Eli
> >>
> >>
> >>
> >>
> >>
> >>
>
>
>
>
>

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