Companies put a ton of work into proprietary RAM training algorithms that I think would be hard to replicate. I know AMD has open sourced their older pre-Zen BIOS and that has made its way into coreboot, but Zen1+ is all proprietary.
Most are using synopsys IP I think, so they don't really have a say in it.
Most are using synopsys IP I think, so they don't really have a say in it.