Date: Wed, 21 Feb 2018 10:11:30 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: bob prohaska <fbsd@www.zefox.net> Cc: freebsd-arm@freebsd.org Subject: Re: Scrambled console on RPi3 Message-ID: <201802211811.w1LIBUAe087135@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20180221170923.GA19462@www.zefox.net>
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> A few minutes ago I unplugged and replugged a PL2303 serial adapter in an
> RPi3 running r329495. The serial console announced the disconnection with
> ugen0.4: <vendor 0x067b product 0x2303> at usbus0 (disconnected)
> uplcom0: at uhub1, port 2, addr 4 (disconnected)
> uplcom0: detached
>
> followed by a torrent of unprintable garbage. Then it calmly announced
>
> <vendor 0x067b product 0x2303> at usbus0
> uplcom0 on uhub1
> uplcom0: <vendor 0x067b product 0x2303, class 0/0, rev 1.10/4.00, addr 4> on usbus0
>
> The displaying host is a Pi3 running the latest Raspbian. It's not clear
> how much, if any, of the oddity is an artifact of the display. Experience
> to date suggests none.
>
> Far as I can tell the pl2303 and the host RPi3 are working normally. I've
> never done this experiment before on a Pi3, but have done it many times on
> a Pi2 and nothing of the sort has happened.
>
> Hope this is of interest to someone...
Do you have which 4 wires connected?
Gnd - should be connected
TX - should be connected
RX - should be connected
Vcc - Do not connect this wire, doing so can lead to odd behavior
unless you happen to be powering the device this way, and
in your case, the RPi3 has a higher load current than USB
can normally supply.
--
Rod Grimes rgrimes@freebsd.org
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