Placing DIMMs in self-refresh mode

Placing DIMMs in self-refresh mode

[Steve Swanson]

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All,

Summary:  As part of the testing process for a Linux + Xeon 4108-based
system we are developing, we need to explicitly place a DIMM into
self-refresh mode.  Is this possible from within the operating system?  How?

Details:

The system we are working on is based on the SuperMicro X11DPi-NT populated
with an Intel Xeon 4108 (Skylake).

I haven’t found anything promising in the kernel source for X86 although
there are hints of support on other platforms.  We have also scoured all
the Intel documents and have found references to the Integrated Memory
Controller, which seems like the piece of hardware that would take care of
this, but I haven’t been able to find documentation fro the IMC on this
processor.   Another likely spot seems to be Asynchronous DRAM Refresh
(ADR) mechanism, but I'm not able find information about how that
functionality might be used to explicitly turn on self-refresh on a
particular DIMM.

Any pointers would be greatly appreciated.

Thanks.

-steve

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