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lazydog
n00b
Joined: 26 Feb 2007
Posts: 64
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 Posted: Sat Aug 05, 2023 8:39 am Post subject: [solved] intel ucode for Core i7-8650U |
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Hey everyone,
as I'm trying to learn more about Linux and Gentoo I'm in the process of installing ucode patches for the mentioned CPU.
I followed this guide:
https://wiki.gentoo.org/wiki/Intel_microcode#Software (New method without initram-fs/disk (efistub compatible))
my CPU has signature 0x000806ea
and when I execute:
| Code: | | iucode_tool -S -l /lib/firmware/intel-ucode/* |
the output is:
| Code: | selected microcodes:
198/001: sig 0x000806e9, pf_mask 0xc0, 2022-12-26, rev 0x00f2, size 105472
198/002: sig 0x000806e9, pf_mask 0x10, 2023-01-02, rev 0x00f2, size 105472
199/001: sig 0x000806ea, pf_mask 0xc0, 2022-12-26, rev 0x00f2, size 105472
200/001: sig 0x000806eb, pf_mask 0xd0, 2022-12-26, rev 0x00f2, size 105472
201/001: sig 0x000806ec, pf_mask 0x94, 2022-12-26, rev 0x00f6, size 105472 |
In the guide only one microcode bundle is shown, and here I have 5 - so which one is right?
Is it 199/001 which matches the signature of my CPU or should I pick the latest one (198/002)?
Or do i have to install all of them in
| Code: | Device Drivers --->
Generic Driver Options --->
Firmware Loader --->
-*- Firmware loading facility
(intel-ucode/06-3c-03) Build named firmware blobs into the kernel binary |
Thanks in advance for any advice 
Btw. Where can I find more information about what these patches do?
Last edited by lazydog on Sat Aug 05, 2023 1:48 pm; edited 1 time in total |
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charles17
Advocate
Joined: 02 Mar 2008
Posts: 3664
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| Posted: Sat Aug 05, 2023 9:43 am Post subject: Re: intel ucode for Core i7-8650U |
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| lazydog wrote: | In the guide only one microcode bundle is shown, and here I have 5 - so which one is right?
Is it 199/001 which matches the signature of my CPU or should I pick the latest one (198/002)?
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I only use the one matching the cpu (given in the first line which you didn't show of the output). |
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pietinger
Moderator
Joined: 17 Oct 2006
Posts: 4167
Location: Bavaria
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| Posted: Sat Aug 05, 2023 10:22 am Post subject: |
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lazydog,
there is an easier way to get your necessary microcode file:
Boot with our GentooCD and then do a "dmesg | grep Intel". You will see a line like this:
| Code: | | [ 4.343171] smpboot: CPU0: 13th Gen Intel(R) Core(TM) i9-13900K (family: 0x6, model: 0xb7, stepping: 0x1) |
Now you have your family, model and steping 
More details here: https://forums.gentoo.org/viewtopic-t-1065464.html |
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lazydog
n00b
Joined: 26 Feb 2007
Posts: 64
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| Posted: Sat Aug 05, 2023 1:48 pm Post subject: |
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Aye, thanks all.
I double checked your suggestions, mine is family 0x06, model 0x8e, stepping 0x0a which corresponds to entry 199/001: sig 0x000806ea shown by the iucode_tool. So the signature shown by
has to match. In other words
| Code: | -*- Firmware loading facility
(intel-ucode/06-8e-0a) Build named firmware
(/lib/firmware) Firmware blobs root directory |
is right. |
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