[Bug 218264] [amdtemp] does not recognize AMD Ryzen/Chipset temperature sensors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218264

--- Comment #5 from Conrad Meyer <cem at freebsd.org> ---
(In reply to Nils Beyer from comment #1)
This is amusing, but for context I have a similar nct sensor on my Intel system
and it doesn't track the core temperatures at all.

At idle, it reports about 8°C cooler than the package/core sensors.

Under load, it climbs more slowly and reaches a peak ~30°C below the
package/core sensors.

Back to idle, it starts falling again while the cores still report 10°C higher.

So I don't think this sensor is sufficient even if we integrated it better.

Fortunately, I was able to find the AMD SB-TSI (sideband temperature sensor)
spec which supposedly documents communication with the CPU temperature sensor
over SMBus.

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