AMD yesterday upstreamed a batch of new CPU microcode files to linux-firmware.git as the de facto repository where component firmware/microcode is easily distributed to Linux distributions. This also marks the first time that Family 1Ah (Family 26) CPU microcode is updated there for the latest Zen 5 processors.
As is usually the case, unfortunately, there is no public change-log or any other insight into the changes of the new CPU microcode updates for Family 19h (Zen 3 / Zen 3+ / Zen 4) and Family 1Ah (Zen 5 so far). The pull request simply notes:
– Update AMD cpu microcode for processor family 19h
– Add AMD cpu microcode for processor family 1ahKey Name = AMD Microcode Signing Key (for signing microcode
container files only)
Key ID = F328AE73
Key Fingerprint = FC7C 6C50 5DAF CC14 7183 57CA E4BE 5339 F328 AE73
As it’s not timed to a Patch Tuesday security disclosure, presumably the CPU microcode updates are just for functional issues and other random fixes. But we’ll see.
In any event the new files are out there for those interested in the updated CPU microcode for recent AMD Zen processors.
