AMD microcode

This article Article description::describes updating the microcode for [[AMD processors.]]

Firmware
Install :

Kernel
The following kernel options should be enabled:

Now reboot the computer with the new kernel.

You may want to only include the firmware suitable to your CPU family. To find it you can look at, which gives the decimal number: grep -F -m 1 "cpu family" /proc/cpuinfo cpu family     : 23

Now include only the one firmware blob for the given cpu family number: