[coreboot] KGPE-D16 and Samsung DDR3L memory sticks

[Daniel Kulesz]

Hi,

> > after a lengthy bisection run I was able to nail down the commit which is causing the MC4 errors in the configurations I tested. I reverted the commit on top of current master, and now my KGPE-D16 fully works without MC4 errors in both 1-CPU-package und 2-CPU-package configurations - that is, with all 16 memory slots populated with the 8GB DDR3L Samsung RDIMMs (PC12800 variant) mentioned in my initial post.
> 
> Thank you for working on that bisect, and for isolating the exact commit
> causing the problem!
> 
> However, we are going to need additional input from other owners of the
> KGPE-D16 to verify that a simple revert does not break support for the
> DIMMs installed in their machines.  In particular, I am interested in
> test reports from those with Kingston RDIMMs since they seemed to be
> among the most finicky.
> 

I have some more DIMMs I could test with if this would help:

- 2x Samsung 2GB 8500R
- 6x Crucial Ballistix Sport (non-RDIMMs, 4 of them have issues in another vendor bios running at the clock specified in the SPD)

> > However, the issue with memory clock (being reported at) 667MHz in dmidecode still remains.
> 
> Can you please send over a debug log at SPEW level showing the romstage
> boot process for 4 DIMMs?  The only log I have right now is for 8.
> 

Yep, will do so!

Cheers, Daniel