Date: Sun, 16 Feb 2020 11:59:14 -0800 From: Conrad Meyer <cem@freebsd.org> To: Peter Jeremy <peter@rulingia.com> Cc: bsd-lists@bsdforge.com, freebsd-current <freebsd-current@freebsd.org>, mike tancsa <mike@sentex.net> Subject: Re: Which AMD CPUs are supported -- temperature Message-ID: <CAG6CVpU0JQR_oKtvBajnZa0t=7nMqUpGB=zdxoCBkzdBD%2BHeSg@mail.gmail.com> In-Reply-To: <20200213072212.GB79914@server.rulingia.com> References: <ad5a6a2d15376e09855c18cac23e92fa@udns.ultimatedns.net> <2e023769-a71a-b83b-0050-6fef5f3c499d@sentex.net> <20200213072212.GB79914@server.rulingia.com>
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The step size of 1/8 degree C/K is documented in the public BKDG (prior to 17h) and PPR (17h+) documents available on AMD=E2=80=99s website, at least = for relatively recent models. I don=E2=80=99t know about very old models (reall= y anything older than 17h, although I=E2=80=99ve looked at the 15h docs some)= . Best, Conrad On Wed, Feb 12, 2020 at 23:22 Peter Jeremy <peter@rulingia.com> wrote: > On 2020-Feb-12 15:23:51 -0500, mike tancsa <mike@sentex.net> wrote: > >Not sure about the older Athlon CPUs, but the 2 generations of Ryzen's I > >have seem correct as well as an APU > > > >CPU: AMD GX-412TC SOC (998.17-MHz K8-clas= s > CPU) > > OTOH, I'm not confident about temperatures on my APU. The publicly > available data just says that the SoC reports "a temperature on its own > scale" relative to a Tctl_max which "is specified in the power and therma= l > data sheet" (that I have been unable to locate). Everyone seems to assum= e > that the step size is 0.125K but I haven't found that publicly documented > anywhere. The AMD Product Brief states that the maximum temperature is > 90=C2=B0C but using that as Tctl_max gives me temperature readings that d= on't > look right. > > >And on a fanless APU > > > ># sysctl -a dev.cpu.0.temperature > >dev.cpu.0.temperature: 62.6C > > > ># sysctl -a dev.amdtemp.0.core0.sensor0 > >dev.amdtemp.0.core0.sensor0: 63.1C > > At what ambient temperature? I see a similar value from my (idle) APU3 > but don't believe the (implied) ~35K junction-to-ambient difference. > > -- > Peter Jeremy >
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