[Bug 243406] [amdtemp] does not recognize AMD Ryzen Threadripper 3970X (Zen 2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243406

            Bug ID: 243406
           Summary: [amdtemp] does not recognize AMD Ryzen Threadripper
                    3970X (Zen 2)
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: blackvenom at gmx.net

amdtemp does not recognize the AMD Ryzen Threadripper 3970X CPU on the TRX40
platform, and reports no temperatures for the chip. No dev.cpu.*.temperature
OIDs are created after loading the module.

I have tried the driver with Zen 2 patches from base r350624 (amdtemp and
amdsmn) as described in bug #239607 and re-installed both drivers from that
source code, then loaded the newly compiled amdsmn and amdtemp.

The modules still won't provide any temperature information however.

The mainboard in my case is an ASRock TRX40 Taichi.

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