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Enabling SO-DOMM modules on the Talos II

The Talos II supports a large number of full sized DIMMs, however, in order to check the feasibility of a smaller form factor (read: laptop), the hardware and firmware need to be able to support SO-DIMMs.

Hardware Requirements

The Sofra POWER9 CPU requires registered DDR4 RAM with EC. This is relatively easy to find in the full-sized form factor, however it becomes a bit harder to find in the SO-DIMM form factor. In this case, we actually need to use SORDIMMs (note the extra R for registered).

After contacting a number of vendors, I received a response from Viking Technology where they were willing to send 10x 16GB, 2666MHz SORDIMM to Digikey so that I could purchase a few sticks: Datasheet:

In order to adapt the above modules to the full sized slot, something like the following can be used:

Software Requirements

Before SORDIMM modules can be used, a couple of minor patches to the hostboot firmware must be made. The first patch is simply enabling hostboot to recognize that SORDIMM modules are valid.