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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=vMnMHR26bEqjq7tA3oThOwp9qFao8JCn1zzFPkSgw2w=; b=Q+mzk9f23fudgi2Mmk7zmHV9wUedPQ4QGsU/ZunoYnbu8OgOjOeWTLgbZExXVrugV0 7PIgIzctIF197EN2IkZ2mfTt9txgnxETaj5QD37UWdsoLk5O1N/EKazmzEezfY42Edut 1n31GUxBvhvz3hoSaZrxnPb6GeDgcpZDz+JH/+aIi8btlEKDGv08FU2pcaPi7hJboUkp xloScFprXhBirAzgFYM/Sz9fT5OPG9uaT+A8ol2kQbA5UBptboxhd+Zv6A9lpE+a8rj2 74wTpGSgqmng24AaejghOTc4HBHN0Xyk3CxLUC/Z3Bcq/W5E6p1R8xvfboYEyDMX3CPL vfvQ== X-Gm-Message-State: ANhLgQ3J/zCZobxctzvMPtgFrPpEjK+uDtxgZrilsE3YbM7aOhVulN60 AnbG1z9GENkfCqPV2y2hNGeoNdtRSbYIYuwnf0qPqW+5 X-Google-Smtp-Source: ADFU+vvgmnH/vE46lkQUpI8J2QTfYUkJyyqrgvpLgnN40o3C/O6XDiDbvl1AWGjz1yry+7oaBSQzKcEnDzSfKDuef/s= X-Received: by 2002:a67:7082:: with SMTP id l124mr15929159vsc.211.1584998552223; Mon, 23 Mar 2020 14:22:32 -0700 (PDT) MIME-Version: 1.0 References: <15849909490.7E5BEBB6.71072@composer.9fans.topicbox.com> In-Reply-To: <15849909490.7E5BEBB6.71072@composer.9fans.topicbox.com> From: Skip Tavakkolian Date: Mon, 23 Mar 2020 14:22:20 -0700 Message-ID: Subject: Re: [9fans] PoE Support for Plan9 on RPI 4B/3B+? To: 9fans <9fans@9fans.net> Content-Type: multipart/alternative; boundary="000000000000acc58f05a18c3baa" Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 6bd47978-6d4c-11ea-bbaf-a6c3ef070ef8 --000000000000acc58f05a18c3baa Content-Type: text/plain; charset="UTF-8" The PoE hat shouldn't need any software support. I don't have one, but it's basically a DC-DC converter. The Pi PoE hat has an Attiny processor for temperature sensing/fan operation. You can also use a PoE splitter (48V->5V/2.4A micro USB) which would work for all Pi's. -Skip On Mon, Mar 23, 2020 at 12:16 PM wrote: > I have four Raspberry Pi model 4B boards and a Raspberry Pi model 3B+ > board and would like to know whether or not Power over Ethernet (PoE) is > supported by the Pi9 port. > > Has anyone attempted to power a Plan9 cluster/grid over PoE? What PoE > network switches would you recommend? Were there any issues? Richard > Miller? > > To be clear, a PoE network enables boards to be powered over an Ethernet > network if a side-board (HAT) is connected. [1] A PoE network switch > conforming to IEEE 802.3af delivers power through the each Pi's RJ45 > network connector over Cat 5 cabling. [2] > > To my knowledge, neither the 9front kernel sources nor the documented > list of supported hardware, specifically mentions PoE. [3] It seems the > network switch and HAT negotiate power delivery independently of the > kernel so I cannot think of a reason why Plan9 would not support > powering this way. > > References > [1]: > https://www.raspberrypi.org/blog/introducing-power-over-ethernet-poe-hat/ > [2]: https://ieeexplore.ieee.org/document/1213877 > [3]: https://9p.io/wiki/plan9/Supported_PC_hardware/index.html > > -- > Barry Wasdell (bwasd) > *9fans * / 9fans / see discussions > + participants > + delivery options > Permalink > > --000000000000acc58f05a18c3baa Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
The PoE hat shouldn't need any software support. I don= 't have one, but it's basically a DC-DC converter. The Pi PoE hat h= as an Attiny processor for temperature sensing/fan operation.

You can also use a PoE splitter (48V->5V/2.4A micro USB) which wou= ld work for all Pi's.

-Skip


On Mon, Mar 23, 2020 at 12:16 PM <barrywasdell@gmail.com> wrote:
I have four Raspberry Pi model 4B boards and a Raspberry Pi model= 3B+
board and would like to know whether or not Power over E= thernet (PoE) is
supported by the Pi9 port.
Has anyone attempted to power a Plan9 cluster/grid over PoE? Wh= at PoE
network switches would you recommend? Were there any i= ssues? Richard
Miller?

To be cle= ar, a PoE network enables boards to be powered over an Ethernet
network if a side-board (HAT) is connected. [1] A PoE network switch
=
conforming to IEEE 802.3af delivers power through the each Pi= 9;s RJ45
network connector over Cat 5 cabling. [2]
<= div>
To my knowledge, neither the 9front kernel sources nor t= he documented
list of supported hardware, specifically mentio= ns PoE. [3] It seems the
network switch and HAT negotiate pow= er delivery independently of the
kernel so I cannot think of = a reason why Plan9 would not support
--000000000000acc58f05a18c3baa--