Thomas Seeling wrote:
Hallo,
Not all the microcode is to fix Spectre!
My experience is that intel microcode for older processors does not
get changed, but they copy it into the latest tarball. When I
I dowloaded the 2018 microcode package and to my big surprise I found
files for old CPUs where there was no microcode update before.
06-17-06
06-0f-0b (two variants of Core2 Duo)
Here's a little shell script to create initrd for microcode update early
loading like suggested in the BLFS book. It's simply the code from there
brushed up by looking up the CPU version. Change if you use AMD instead
of intel.
You need to add a line to /boot/grub/grub.cfg if it isn't there already.
The microcode file needs to be available in /sources.
menuentry "4.14.13-lfs-8.1" {
set root=(hd0,1)
linux /boot/vmlinuz-4.14.13-lfs-8.1 root=/dev/sda1 ro
initrd /boot/microcode.img
}
#!/bin/sh
cd /sources
mc=$(ls -1rt microcode*| tail -1)
test -z "${mc}" && exit 1
cpu=$(awk '/^cpu family.:/{family=$NF}
/^model..:/{model=$NF}
/^stepping.:/{stepping=$NF}
END{printf"%02x-%02x-%02x",family,model,stepping}' /proc/cpuinfo)
tar xf "${mc}" intel-ucode/"${cpu}"
test -f intel-ucode/"${cpu}" || exit 1
echo "# found intel-ucode/${cpu}"
cp intel-ucode/"${cpu}" /lib/firmware/intel-ucode/
mkdir -p /boot/initrd /lib/firmware/intel-ucode
cd /boot/initrd
mkdir -p kernel/x86/microcode
cp -v /lib/firmware/intel-ucode/* kernel/x86/microcode/GenuineIntel.bin
find . | cpio -o -H newc > /boot/microcode.img
Tschau...Thomas
Very interesting. One thing I've started doing is adding the model number
to the microcode:
initrd /microcode-06-5e-03.img
I'm thinking about adding the release date also. Like:
microcode-06-5e-03-20180108.img
-- Bruce
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