[Bug 278311] amdtemp: Does not recognize AMD Threadripper 7960X

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278311

            Bug ID: 278311
           Summary: amdtemp: Does not recognize AMD Threadripper 7960X
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jbo@FreeBSD.org

amdtemp does not seem to be able to report CPU temperatures for the AMD Ryzen
Threadripper 7960X CPU as of stable/14
b556c37f83b03432af6dd9af1a4e143fc8b2e100.

# dmidecode -t processor

# dmidecode 3.5
# SMBIOS entry point at 0x6e2a8000
Found SMBIOS entry point in EFI, reading table from /dev/mem.
SMBIOS 3.6 present.
# SMBIOS implementations newer than version 3.5.0 are not
# fully supported by this version of dmidecode.

Handle 0x0010, DMI type 4, 48 bytes
Processor Information
        Socket Designation: SP6
        Type: Central Processor
        Family: Zen
        Manufacturer: Advanced Micro Devices, Inc.
        ID: 81 0F A1 00 FF FB 8B 17
        Signature: Family 25, Model 24, Stepping 1
        Flags:
                FPU (Floating-point unit on-chip)
                VME (Virtual mode extension)
                DE (Debugging extension)
                PSE (Page size extension)
                TSC (Time stamp counter)
                MSR (Model specific registers)
                PAE (Physical address extension)
                MCE (Machine check exception)
                CX8 (CMPXCHG8 instruction supported)
                APIC (On-chip APIC hardware supported)
                SEP (Fast system call)
                MTRR (Memory type range registers)
                PGE (Page global enable)
                MCA (Machine check architecture)
                CMOV (Conditional move instruction supported)
                PAT (Page attribute table)
                PSE-36 (36-bit page size extension)
                CLFSH (CLFLUSH instruction supported)
                MMX (MMX technology supported)
                FXSR (FXSAVE and FXSTOR instructions supported)
                SSE (Streaming SIMD extensions)
                SSE2 (Streaming SIMD extensions 2)
                HTT (Multi-threading)
        Version: AMD Ryzen Threadripper 7960X 24-Cores          
        Voltage: 1.2 V
        External Clock: 100 MHz
        Max Speed: 5650 MHz
        Current Speed: 4200 MHz
        Status: Populated, Enabled
        Upgrade: <OUT OF SPEC>
        L1 Cache Handle: 0x000D
        L2 Cache Handle: 0x000E
        L3 Cache Handle: 0x000F
        Serial Number: Unknown
        Asset Tag: Unknown
        Part Number: Unknown
        Core Count: 24
        Core Enabled: 24
        Thread Count: 48
        Characteristics:
                64-bit capable
                Multi-Core
                Hardware Thread
                Execute Protection
                Enhanced Virtualization
                Power/Performance Control

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