[EXT] Re: OpenBMC Sensors

[Emily Shaffer]

Great, best luck Aaron. Thanks!

On Wed, Jan 30, 2019, 1:47 PM Aaron Williams <awilliams at marvell.com> wrote:

> Hi Emily,
>
> Thank you, I will look into it. I don't think losing the sensors when we
> cut
> power to the host CPU will be much of an issue. I was just notified of a
> change to our CPLD that will allow the BMC to keep the sensors powered. At
> the
> moment, cutting power shuts of the power from the ATX power supply but now
> I
> will have more fine-grained power control. Now I just have to figure out
> how
> to update the Lattice CPLD from the BMC... I found some code in the
> Facebook
> OpenBMC which hopefully I can port over.
>
> -Aaron
>
> On Wednesday, January 30, 2019 1:42:40 PM PST Emily Shaffer wrote:
> > Aaron, we use this daemon for local (to BMC) thermal control:
> > https://github.com/openbmc/phosphor-pid-control
> > Maybe you'll find it helpful.
> >
> > Although I'm not sure how to help you with losing sensors when the host
> > powers down but the BMC is expected to continue to cool the tray.  Sounds
> > like an issue with the board design, unless I'm not understanding what
> > you're saying.
> >
> > On Wed, Jan 30, 2019 at 1:28 PM Aaron Williams <awilliams at marvell.com>
> >
> > wrote:
> > > Hi Emily,
> > >
> > > That's what I need the temperature for. We have two controllers, one
> that
> > > monitors the core temperature (a TI TMP421) and one that controls the
> fans
> > > (ADT7462). In order to maintain the thermal envelope the TMP421 needs
> to
> > > be
> > > monitored to adjust the fan speed through the ADT7462.
> > >
> > > Further complicating things is the fact that these sensors disappear
> when
> > > the
> > > host is powered down.
> > >
> > > -Aaron
> > >
> > > On Wednesday, January 30, 2019 9:49:32 AM PST Emily Shaffer wrote:
> > > > External Email
> > > >
> > > >
> ----------------------------------------------------------------------
> > > > Hi Aaron,
> > > >
> > > > Note that you only really need to worry about sending the temperature
> > > > via
> > > > IPMI if you want to send it somewhere besides the BMC.  If you plan
> to
> > > > do
> > > > internal thermal control (BMC reads temperature, BMC adjusts fans
> > > > accordingly) you probably don't need IPMI config and can get away
> with
> > > > setting it up as far as DBus in the sensor architecture doc Lei sent.
> > > >
> > > > Emily
> > > >
> > > > On Thu, Jan 24, 2019 at 1:27 AM Lei YU <mine260309 at gmail.com> wrote:
> > > > > On Thu, Jan 24, 2019 at 5:13 PM Aaron Williams <
> awilliams at marvell.com>
> > > > >
> > > > > wrote:
> > > > > > I see how to set up the hwmon portion defining the devices based
> on
> > >
> > > the
> > >
> > > > > device
> > > > >
> > > > > > tree, but I am unsure how to go about configuring the YAML and
> other
> > > > >
> > > > > files for
> > > > >
> > > > > > this.
> > > > >
> > > > > For sensors' config, please refer to
> > > > > https://github.com/openbmc/docs/blob/master/sensor-architecture.md
> > >
> > > > > And it looks you are looking for fan controls, then you could
> refer
> to:
> > >
> https://github.com/mine260309/openbmc-intro/blob/master/Porting_Guide.md#f
> > >
> > > > > ans
> > > > >
> > > > > (I really need to submit my porting guide to openbmc/docs)
>
>
>
>
>
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