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Subject: Re: PMC
From: Mike Jones <proclivis@gmail.com>
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Date: Fri, 23 Apr 2021 11:30:54 -0600
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To: Patrick Williams <patrick@stwcx.xyz>
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Patrick,

Now I see clearly.

I=E2=80=99ll see more where the ADI team wants to go in terms of =
demonstration.

Are there existing PMC implementations for ORv3, or is the work of your =
interest the first? Is their existing hardware to base OBMC running in a =
BMC to work from?

Mike

> On Apr 23, 2021, at 11:19 AM, Patrick Williams <patrick@stwcx.xyz> =
wrote:
>=20
> Hi Mike,
>=20
> On Fri, Apr 23, 2021 at 08:49:05AM -0600, Mike Jones wrote:
>> Patrick,
>>=20
>> We are using spec: Open Rack V3 48V BBU.
>=20
> Got it.
>=20
> I think you'll want to look here:
> - https://www.opencompute.org/wiki/Open_Rack/SpecsAndDesigns
>=20
>> In the case of a PMC, since I don=E2=80=99t know the OCP architecture =
well, is there a PMC device in the rack that would manage a BBU, or do =
devices that plug into their rack each have a PMC?
>>=20
>> Looking at the above spec, the functions of the MCU are quite =
limited, so I assume there is a PMC device that is managing these other =
elements like a BBU.=20
>=20
> If you look at the Power Shelf design you'll see mention of a PMC/PMI
> connector.  This is a slot for which two different designs can fit =
into:
> PMC or PMI (and I don't recall exactly what the "I" stands for).
>=20
> With PMC, the intended design was this was a full BMC-class device =
with
> a network interface.  This would run OpenBMC.
>=20
> With PMI, there is a MCU in place of the BMC and the PMI is connected =
to
> the top-of-rack switch using a modbus / RS-485 over RJ-45 =
implementation
> like was available in ORv2.  I think the PMI would speak the same =
exact
> protocol as the similar device in ORv2.
>=20
> You might find details on this modbus protocol in the above link, but
> there is a lot to dig through...
>=20
> --=20
> Patrick Williams