The thing is it doesn't matter that much anymore, so people aren't working on it. Both AMD and Intel modern CPUs require proprietary embedded firmwares to even

The thing is it doesn't matter that much anymore, so people aren't working on it. Both AMD and Intel modern CPUs require proprietary embedded firmwares to even get to the boot stage (as you know). And logically it makes sense - there is no real distinction between hardware and software - it should be an implementation detail.