Create microcode update archives and load them in GRUB #342
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pmenzel
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pmenzel
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Aug 16, 2023
The Linux kernel [documentation][1] and the distributions prepend them
to the possibly compressed initrd image manually, but then you need a
script like `lsinitramfs` to view the content, if it’s compressed.
Using separate files uses possibly not well tested GRUB code paths, but
allows us to easily handle all the files.
$ gunzip --to-stdout -S .igz /boot/grub/initramfs.igz | cpio -i -t
$ cpio -i --file /boot/amd-ucode.img -t
$ cpio -i --file /boot/intel-ucode.img -t
[1]: https://docs.kernel.org/arch/x86/microcode.html
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pmenzel
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Oct 5, 2023
*sauterelles* experienced frequent hangs since the boot on August 27th,
2023. Due to merge/pull request [*Create microcode update archives and
load them in GRUB*][1] newer microcode 0x5003604 was loaded early.
[ 0.000000] microcode: microcode updated early to revision 0x5003604, date = 2023-03-17
[ 0.000000] Linux version 5.15.86.mx64.443 (root@theinternet.molgen.mpg.de) (gcc (GCC) 10.4.0, GNU ld (GNU Binutils) 2.37) #1 SMP Thu Jan 5 12:40:04 CET 2023
History:
$ last reboot | head -7
reboot system boot 5.15.77.mx64.440 Wed Oct 4 12:20 still running
reboot system boot 5.15.77.mx64.440 Wed Oct 4 10:33 - 12:19 (01:45)
reboot system boot 5.15.77.mx64.440 Mon Oct 2 11:00 - 12:19 (2+01:18)
reboot system boot 5.15.86.mx64.443 Mon Sep 11 11:42 - 12:19 (23+00:36)
reboot system boot 5.15.86.mx64.443 Sun Aug 27 19:28 - 11:23 (14+15:54)
reboot system boot 5.15.86.mx64.443 Tue Feb 7 11:39 - 11:23 (215+22:43)
reboot system boot 5.15.77.mx64.440 Wed Dec 14 23:05 - 11:32 (54+12:26)
As the identical file servers * epizootie*, *plage*, *rabies*, *lyssa*,
and *grele*, that haven’t been rebooted, do not show any problems, the
hangs might be due to the microcode updates.
Therefore, do not load Intel microcode updates early, until the issue is
better understood.
[1]: #342
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The switch
--initramfsnow also creates the microcode update archives in/boot.