From mboxrd@z Thu Jan 1 00:00:00 1970 From: John S Date: Mon, 24 Dec 2018 19:54:09 +0000 (UTC) Subject: [U-Boot] [linux-sunxi] A20-olinuxino-micro hangs in U-boot if powered from MINI-USB only. In-Reply-To: <5C213335.3020206@yandex.ru> References: <5C200654.3050708@yandex.ru> <20181224183259.ee93b3d8d50401318af9cb7d@tiscali.it> <5C213335.3020206@yandex.ru> Message-ID: <439238967.14129659.1545681249039@mail.yahoo.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Monday, 24 December 2018, 19:10:24 GMT, Nikolai Zhubr wrote: >>Hi,24.12.2018 20:32, Diego Roversi: >>> I'm observing that the said A20-onlinuxino-micro board hangs in U-boot >> in probing USB2 (see example below) in case it is powered by connecting >> >> I think it's normal. During the boot, u-boot initialize the usb otg, and for a >> fraction of second the power is disconnected. I solved it by attaching a >> battery (and I have a PSU as a side effect :) ). > Ah, got it. Thats a funny issue then. Its not the software to blame. Ok. > (Ideally, this peculiarity should probably have been mentioned by Olimex > in their docs, but maybe I've overlooked it.) > Solved it for now by disabling USB altogether. Isn't it caused by the software as stated above, i.e. nothing to do with Olimex? John