From nobody Sun Jan 07 02:36:34 2024 X-Original-To: freebsd-arm@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4T71Xz6Cgcz56DD2 for ; Sun, 7 Jan 2024 02:36:35 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (www.zefox.net [50.1.20.27]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "www.zefox.com", Issuer "www.zefox.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4T71Xz1LhJz4n58 for ; Sun, 7 Jan 2024 02:36:35 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Authentication-Results: mx1.freebsd.org; none Received: from www.zefox.net (localhost [127.0.0.1]) by www.zefox.net (8.17.1/8.15.2) with ESMTPS id 4072aZvr086173 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sat, 6 Jan 2024 18:36:35 -0800 (PST) (envelope-from fbsd@www.zefox.net) Received: (from fbsd@localhost) by www.zefox.net (8.17.1/8.15.2/Submit) id 4072aYP1086172; Sat, 6 Jan 2024 18:36:34 -0800 (PST) (envelope-from fbsd) Date: Sat, 6 Jan 2024 18:36:34 -0800 From: bob prohaska To: Marcin Cieslak Cc: freebsd-arm@freebsd.org Subject: Re: USB-serial adapter suggestions needed Message-ID: References: <9o7q7p36-o7pn-27o9-62no-8p1r6o127123@fncre.vasb> <849BD5E3-4C09-46CB-932D-ADC1B45F3C73@yahoo.com> <6s123oq9-qo39-rpqq-4q91-p6r3946003p9@fncre.vasb> List-Id: Porting FreeBSD to ARM processors List-Archive: https://lists.freebsd.org/archives/freebsd-arm List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-arm@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6s123oq9-qo39-rpqq-4q91-p6r3946003p9@fncre.vasb> X-Rspamd-Queue-Id: 4T71Xz1LhJz4n58 X-Spamd-Bar: ---- X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:7065, ipnet:50.1.16.0/20, country:US] On Sat, Jan 06, 2024 at 11:44:49PM +0000, Marcin Cieslak wrote: > On Fri, 5 Jan 2024, Mark Millard wrote: > > > I also request to again list the exact content of the two > > config.txt files --and again every time they are changed during > > this investigation. > > I second this. There is way too much text in this conversation > and not enough data. It also does not help if every system is somewhat > different. Unfortunately, the systems simply are different. Four Pi2, two Pi3, one Pi4. I'll try to make the config.txt files on the Pi3s match better when the present experiment is complete. The interconnection of hosts is unique and, apparently, unusual. Not all of that is relevant, but exatctly what part isn't yet obvious. > > I have skimmed the peripherial documentation for one of the Broadcom > chips (I think the one from Raspberry Pi 3) and it says that > the speed of the mini uart depends on the CPU clock frequency. > > I could imagine a situation when mini uart speed changes during > downlocking the CPU. There was suggestion to not use mini uart. > Use the port where the frequency is not changing with the weather. > Agreed, and I changed config.txt to set dtoverly=disable-bt on www.zefox.org (the console host) to force use of the PL011. It didn't help detectably. > I don't know how smart is the power management with powerd, but > I could also imagine shutting down peripherials or stopping the UART > clock as a potential power saving feature, so here you are. No sign of that, but Mark posited that powerd might be causing trouble with the terminal server (pelorus in this test). That looks like a possibility. At the moment pelorus is without powerd and it's holding a serial connection to www.zefox.org. Meanwhile www.zefox.org is running powerd and buildworld while being a terminal server to a Pi4 named nemesis.zefox.com That connection has dropped twice so far today. It'll be a day or so before buildworld finishes. Thanks for writing! bob prohaska