[coreboot] K8 machine with (a lot of) ram from 2 vendors keeps resetting

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Thu Sep 3 07:26:27 CEST 2009

On 02.09.2009 23:14, Ward Vandewege wrote:
> I'm having some problems with a supermicro h8dme board with 2 K8 processors
> and 64 GB of ram.
> Sadly, the ram is of two types (that was not my decision :/). We have 8x 4GB
> Samsung M393T5160QZA-CE6 and 8x 4GB Kingston KVR667D2D4P5/4G. Both of these
> types of ram are dual rank DDR2, 667 MHz, CL5, 1.8 V, registered, ECC.

The K8 memory code has some oddities which cause it to break down even
if the SPD parameters you use are identical. Not only must all SPD
timing parameters be identical, they also have to be stored at the same
byte addresses in each SPD. I sent a patch for this to the list sometime
last year, but it was never completely finished. I can try to dig it up
if you want to take a look.



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