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On 2018.12.06 15:58, Dale wrote: |
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[snip...] |
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> My concern is this tho. I have my old CPU still installed and |
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> everything is compiled based on that. So, I'm stable with the old |
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> CPU. However, when I shutdown, take out the old CPU and install the |
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> new one, I'm concerned it may not boot at all because of the change |
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> or may boot but be very unstable. I recall years ago being able to |
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> set up the flags in such a way that it can run on virtually any CPU |
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> but it's been a long time ago and I don't know if it is needed or |
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> not. My hope was, someone did a very similar upgrade and can say for |
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> sure if it works or if I need to do things before changing the CPUs |
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> to make sure I can boot and be stable. If I can just get a stable |
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> console, I can do a emerge -e world and get the OS inline with the |
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> CPU. I'm just concerned whether I will have that or not. |
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> |
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[snip...] |
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> |
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> I just don't want to swap CPUs only to find out I've got to swap back |
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> because my system won't boot at all. Heck, it may even fail to load |
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> the kernel itself for all I know. |
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I once made the mistake of getting a whole new (used...) PC and just |
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moved the HDD from the old one to the new, without thinking about any |
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of this. Of course it wouldn't boot at all, because I was switching |
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from an AMD to an Intel CPU and had set all flags accordingly in the |
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old box. In your case, as long as you include any flags necessary for |
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the new CPU, and remove any flags for features the new CPU does not |
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have, you should be good. (I know that sounds simple, but does ignore |
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how you find that info.) Given your two CPUs are relatively close |
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(unless I misread something) there should be little if anything |
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critical to change. |
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|
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However, if you have a live DVD, (or on USB stick) that will always |
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boot, and you can then do a chroot and reset flags and start |
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recompiling whatever might fail. I actually think the kernel IS the |
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likely failure if any, but once that boots, you should be good to |
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recompile whatever fails. (Yes, toolchain stuff might be an issue, but |
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again, just boot back to the live DVD.) You may need to reboot a few |
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times, but you won't need to swap the old CPU back in. |
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Jack |
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