[duskwuff]

> I don't want some proprietary firmware sit between me and the CPU.

No, you do.

A significant part of what that firmware does is initializing low-level hardware, like the system's memory controller. Replicating that is probably well beyond your abilities.

[Taniwha]

Seriously, it's not just a matter of poking a few registers - it involves doing a bunch of statistical measurements of memory errors to pick the correct thresholds on the data bus

[duskwuff]

And it's rather hardware-specific. Even if you have a solution which works for your CPU / motherboard / RAM, changing any of those components is quite likely to make it stop working. (And lord help you if you want it to work across CPU manufacturers...)

[some_random]

I mean, ideally it would be open-source and verifiable. But damn there's no way you're going to hackernews it in a weekend