Updating CPU Microcode
March 28, 2018 — 12:50

Author: silver  Category: hardware linux windows  Comments: Off


Tool from Intel called “BIOS Implementation Test Suite”. Bootable (usb) image which can do several things including handling microcode:


load/update microcode using pkg:


  • Intel: apt install intel-microcode iucode-tool
  • AMD: apt install amd64-microcode
  • Doc: /usr/share/doc/{intel,amd64}-microcode/README.Debian.gz


load/update intel microcode manually:

  • get latest tgz from intel: see below
  • backup/copy files: /lib/firmware/intel-ucode
  • check kernel config: grep MICROCODE /boot/config-*
  • run iucode_tool:
    /usr/sbin/iucode_tool -tb -lS /lib/firmware/intel-ucode/*
  • update initramfs: update-initramfs -u -k all

reloading microcode:

  • echo 1 > /sys/devices/system/cpu/microcode/reload
  • or: rmmod cpuid; modprobe cpuid

show version:

  • dmesg | grep microcode
  • grep microcode /proc/cpuinfo

skip loading microcode on boot:

  • add to grub cmdline: dis_ucode_ldr


Microsoft includes microcode updates in Windows for certain CPU’s. For example: KB4090007, KB3064209, KB2970215.

load/update microcode:

show version:

  • get hwinfo64 and goto “Central Processor(s)” > “Microcode Update Revision”
  • or get “Read & Write Everything” (RWEverything) from http://rweverything.com

Get Microcode

Download the latest version from Intel:

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