From owner-freebsd-arm@freebsd.org Sun Jun 19 00:36:55 2016 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C8255A782D3 for ; Sun, 19 Jun 2016 00:36:55 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (www.zefox.net [69.239.235.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "www.zefox.org", Issuer "www.zefox.org" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 7D83F2204 for ; Sun, 19 Jun 2016 00:36:55 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (localhost [127.0.0.1]) by www.zefox.net (8.15.2/8.15.2) with ESMTPS id u5J0aqHW042478 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 18 Jun 2016 17:36:53 -0700 (PDT) (envelope-from fbsd@www.zefox.net) Received: (from fbsd@localhost) by www.zefox.net (8.15.2/8.15.2/Submit) id u5J0aqXM042477; Sat, 18 Jun 2016 17:36:52 -0700 (PDT) (envelope-from fbsd) Date: Sat, 18 Jun 2016 17:36:51 -0700 From: bob prohaska To: Hal Murray Cc: freebsd-arm@freebsd.org, bob prohaska Subject: Re: pl2303 lockups on rpi2 Message-ID: <20160619003651.GB38492@www.zefox.net> References: <20160618025517.GA38492@www.zefox.net> <20160618043430.28E93406057@ip-64-139-1-69.sjc.megapath.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160618043430.28E93406057@ip-64-139-1-69.sjc.megapath.net> User-Agent: Mutt/1.5.24 (2015-08-30) X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Jun 2016 00:36:55 -0000 On Fri, Jun 17, 2016 at 09:34:30PM -0700, Hal Murray wrote: > > How solid is your power? > The three RPI2s that I can check easily are all over 5 Volts. The fourth is hard to get at, but it shares the same power supply type and is unlikely to be significantly different. Swapping places between the two adapters that locked up with the two that kept working didn't turn out as planned. The two adapters that were failing still failed, but one that hadn't failed up to then did, in about 48 hours. The one encouragement is that updating to r301978 and rebooting unstuck an adapter that had locked up under r301569. Up to now it's been necessary to expose the adapters to Prolific's driver to unstick them. Unplugging and replugging didn't help. There seem to be nine supported USB-serial adapter types, can you suggest a better bet if I have to go shopping again? I can't find kind words about any of them. Thanks for reading! bob prohaska > I've seen USB screwups on a Pi 3 running Linux talking to a GPS unit with a > PL2303. The symptom was that every day or two, it just stopped working. > Unplugging and replugging fixed it. I didn't find a way to fix it from the > command line. > > Somebody suggested that a Pi-? needs more than 4.8 V. My setup was running > at 4.8 V. Power seemed like a likely problem, but I didn't track down the > source. It could be a handy urban legend. > > You can get USB cables with heavier gauge power wires. I got some Tronsmart > brand. They gave me a bit more than an extra 0.1 V, but I don't have enough > hours on them to know if it solved the problem. > > > -- > These are my opinions. I hate spam. > > >