From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikolai Zhubr Date: Fri, 28 Dec 2018 01:20:14 +0300 Subject: [U-Boot] [linux-sunxi] A20-olinuxino-micro hangs in U-boot if powered from MINI-USB only. In-Reply-To: <2015861864.15538610.1545943686958@mail.yahoo.com> References: <5C200654.3050708@yandex.ru> <20181224183259.ee93b3d8d50401318af9cb7d@tiscali.it> <5C213335.3020206@yandex.ru> <439238967.14129659.1545681249039@mail.yahoo.com> <5C215592.3030506@yandex.ru> <2015861864.15538610.1545943686958@mail.yahoo.com> Message-ID: <5C25501E.5020906@yandex.ru> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, 27.12.2018 23:48, 'John S' via linux-sunxi: >> Well, IMHO is has to do with Olimex because they designed this specific >> circuitry, and the circuitry is such that 5V voltage constantly applied >> to the micro-usb connector might essentially become disconnected (at the >> board side) by programming -- if I understood it correctly. > > The software needs to be responsible for its own actions. Sure, ideally. That's why I reported. > Does the problem you reported occur with the Olimex image(s)? If so it may be wise to report it to Olimex. I can't say about Olimex images at the moment because I switched to more current (alternative) images and subsequently to mainline openwrt and the board is already mounted for intended operation. Maybe I do some experiments later. I'd like to clarify, I don't blame Olimex, they are nice. Keeping close to mainline is not always easy. > If not, which commit or change caused it? Again, I can't say at the moment. Not even sure if it could be fixed on the software side. > BTW I read in the Olimex documentation that best practice is to power it differently than the way you mention. Yes, that is true. But powering through mini-usb is so wonderfully handy! Thank you, Regards, Nikolai > John >