I don't think a straight 'drop-in/replacement' will boot. The CPU scheduler does change from 'fam10h' to 'fam15h'. The '3DNow!' && 'enhanced 3DNow!' ( used in fam10h ) instructions are dropped / removed in fam15h.
Doing the 'emerge -e @world' with '-march=generic' is probably the only guaranteed to work solution. If you take this route set the CPU_FLAGS_X86= to MMX, SSE, SSE2 with no 3DNow!, enhanced 3DNow! ( gcc flags / CFLAGS -mno-3dnow, -mno-3dnowa ) Just remember to change the kernel configuration also. Reference Links : https://en.wikipedia.org/wiki/Phenom_II https://en.wikipedia.org/wiki/List_of_AMD_FX_microprocessors On 12/6/18 2:58 PM, Dale wrote: > Hi, > > My concern is this tho. I have my old CPU still installed and > everything is compiled based on that. So, I'm stable with the old CPU. > However, when I shutdown, take out the old CPU and install the new one, > I'm concerned it may not boot at all because of the change or may boot > but be very unstable. I recall years ago being able to set up the flags > in such a way that it can run on virtually any CPU but it's been a long > time ago and I don't know if it is needed or not. My hope was, someone > did a very similar upgrade and can say for sure if it works or if I need > to do things before changing the CPUs to make sure I can boot and be > stable. If I can just get a stable console, I can do a emerge -e world > and get the OS inline with the CPU. I'm just concerned whether I will > have that or not. >
