this post was submitted on 26 Aug 2023
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https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/log/?qt=grep&q=AMD+microcode
Yes, very rare and very few cpu up to date, almost none of them
show that "very few cpu up to date"
see for instance the microcode for family 19, the Zen3, Zen4 family, the microcode update is:
Microcode patches in microcode_amd_fam19h.bin: Family=0x19 Model=0x11 Stepping=0x01: Patch=0x0a10113e Length=5568 bytes Family=0x19 Model=0x11 Stepping=0x02: Patch=0x0a10123e Length=5568 bytes Family=0x19 Model=0xa0 Stepping=0x02: Patch=0x0aa00212 Length=5568 bytes Family=0x19 Model=0x01 Stepping=0x01: Patch=0x0a0011d1 Length=5568 bytes Family=0x19 Model=0x01 Stepping=0x00: Patch=0x0a001079 Length=5568 bytes Family=0x19 Model=0x01 Stepping=0x02: Patch=0x0a001234 Length=5568 bytes Family=0x19 Model=0xa0 Stepping=0x01: Patch=0x0aa00116 Length=5568 bytes
There is only update for 7 CPUs, compare this to the number of CPU they have in this family:
https://en.wikipedia.org/wiki/List_of_AMD_Ryzen_processors
I have a 5600H, family 0x19 and model 0x50, no update, as well as dozens of others AMD cpu.
The last update for Zen 3, Zen 3+, Zen 4 was 08/08/2023 and the last update for Zen, Zen+, Zen 2 was 19/07/2023.
For reference, Intel also last updated theirs 08/08/2023.
Yes you can argue that we don't explicitly know what CPUs in those families were updated, but I don't really care.
We know, here's the list, it's pretty poor, AMD don't release often its microcode, and when they do it's only for a few select CPUs
https://salsa.debian.org/hmh/amd64-microcode/-/blob/main/amd-ucode/README
If you are lucky, someone will extract its microcode from his BIOS and put it there:
https://github.com/platomav/CPUMicrocodes/tree/master/AMD