I'm looking at dmesg output which on my Intel CPUS of various vintages shows 
"microcode updated early ..." but two different AMD APUs of mine do not show 
the same, despite AMD apparently releasing microcode updates going back to 
2011:

https://www.bleepingcomputer.com/news/hardware/amd-releases-spectre-v2-microcode-updates-for-cpus-going-back-to-2011/

I have observed OEMs for laptop MoBos rarely if ever bother to release a UEFI/
BIOS firmware update past 1-2 years from launch of their products, while 
desktop OEMs may keep releasing updates for 3-5 years.

Since there are no OEM MoBo firmware releases and I see no "microcode updated 
early ..." message in dmesg, I thought of checking with other Gentoo users if 
I'm doing something wrong, or if this is a common observation for AMD CPU/
APUs?

PS. I include the microcode in the kernel, for both my Intel and AMD systems,  
rather than use an initramfs; e.g.

CONFIG_EXTRA_FIRMWARE="amd-ucode/microcode_amd_fam15h.bin ..."

PPS. This is all shown on one of the AMD APUs, way down during the booting 
process:

$ dmesg | grep -i micro
[    0.622441] [drm] Loading ARUBA Microcode
[    5.763242] [drm] Loading hainan Microcode
[    6.653025] microcode: CPU0: patch_level=0x06001119
[    6.657962] microcode: CPU1: patch_level=0x06001119
[    6.658890] microcode: CPU2: patch_level=0x06001119
[    6.659881] microcode: CPU3: patch_level=0x06001119
[    6.661136] microcode: Microcode Update Driver: v2.2.

-- 
Regards,

Mick