no you didn't overlook. the article doesn't discuss actual mechanics of DRAM init, so thank you for adding this info :) i know there is a process of memory training whose aim is to arrive at the right parameters for that DRAM. the way i see it, it is sort of in-field caliberation. boot firmware can then store those parameters inside BIOS chip and then on next reboot just use those parameters, because memory training is a time-consuming process.
