Viewing topic Switching CPU type. Do I have to prepare/change initramfs?

Title: Switching CPU type. Do I have to prepare/change initramfs?

peta77 4 Apr 2022

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Hi.

So I will be changing some of my hardware soon which actually only is a switch from intel-CPU to AMD-CPU.
As I don't want to re-install everything, just re-use my current Linux installation, I'm asking myself if I need to do something to make sure it's working. As all CPUs need some microcode to be able to run properly and this is usually included in the initramfs, do I have to add that beforehand for AMD-CPUs? Currently included is "kernel/x86/microcode/GenuineIntel.bin" but nothing for AMD.
Web-search has returned confusing results so far: extend initramfs, do nothing, remove all microcode from initramfs, etc. ...

So, does anyone here have experience with that? Any advice on what to do, what not to do and what to pay special attention?

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Liam Dawe 4 Apr 2022

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I just did the same, Intel to Ryzen, changed nothing - all fine.

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peta77 4 Apr 2022

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That sounds perfect, that's exactly what I wished for. :smile:
Thanks Liam.

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mr-victory 4 Apr 2022

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There may be microcode for AMD CPUs in repositories. Apart from installing that, I wouldn't much bother.

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WorMzy 4 Apr 2022

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You shouldn't need to reinstall everything, but if openSUSE 'optimises' the initrd by stripping out unneeded modules for your current hardware (mkinitcpio on Arch has the 'autodetect' hook for this), you may need to boot a 'fallback' initrd which includes all modules.

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peta77 4 Apr 2022

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Quoting: mr-victoryThere may be microcode for AMD CPUs in repositories. Apart from installing that, I wouldn't much bother.

Thx for the reminder... Checked, it's there and it is already installed... SuSE seems to install it by default...

Quoting: WorMzyYou shouldn't need to reinstall everything, but if openSUSE 'optimises' the initrd by stripping out unneeded modules for your current hardware (mkinitcpio on Arch has the 'autodetect' hook for this), you may need to boot a 'fallback' initrd which includes all modules.

Well openSuSE does some kind of filtering (as it only includes intel-ucode, not the amd one)... but it does seem to include pretty much all kernel modules...

So - just in case - how do I create a fallback and pack all necessary stuff in it, and how and where do I specify it?

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