From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753939AbeCUWNu (ORCPT ); Wed, 21 Mar 2018 18:13:50 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:35287 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753744AbeCUWNs (ORCPT ); Wed, 21 Mar 2018 18:13:48 -0400 Date: Wed, 21 Mar 2018 23:13:47 +0100 From: Pavel Machek To: Tony Lindgren Cc: Sebastian Reichel , kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, nekit1000@gmail.com, mpartap@gmx.net Subject: Re: 4.16-rc5 on Motorola Droid 4 Message-ID: <20180321221346.GA18313@amd> References: <20180318220418.GA22880@amd> <20180320140322.GU5799@atomide.com> <20180320170029.rv3u5wlvqxfl7z2v@earth.universe> <20180321203137.GA23637@amd> <20180321215733.GE5799@atomide.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tKW2IUtsqtDRztdT" Content-Disposition: inline In-Reply-To: <20180321215733.GE5799@atomide.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --tKW2IUtsqtDRztdT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed 2018-03-21 14:57:33, Tony Lindgren wrote: > * Pavel Machek [180321 20:32]: > > Hi! > >=20 > > > > Maybe get somebody to help you locally with the debug cable > > > > soldering? :) > > >=20 > > > I suppose people from your hackerspace can help you. It's really > > > easy to do. Soldering can be avoided btw. You can just use a pair > > > of scissors to cut a USB -> Micro USB cable and use a knife to remove > > > isolation. Then screw each of the 4 wires into a terminal strip. > > > There are USB-TTL adapters available, that have an attached cable. > > > If you also cut the connector from such a cable and connect it to > > > the other side of the terminal strip you are done. No soldering > > > involved ;) > >=20 > > Hm. How big no-no is connecting USB-TTL adapter to D+/D- pins? Because > > that's what I could do "easily" and seems to work ;-). >=20 > Well if the VBUS line is not connected the PMIC is muxed > to USB carkit mode so the lines go to the UART on the SoC > through some level shifter. If it works it should not cause > any issues, the symptoms I saw earlier was corrupted UART > console and noticed that what worked best for me was 3.3V > ftdi based devices out of the collection of random pl2303 > and ftdi cables I had around. So.. I do have some fun on the UART (^@ inserted). > I guess somebody could try to measure the uart lines with > a scope with nothing connected and sending out data from > droid 4. Or look at the carkit spec for the UART voltage > levels. Voltmeter says Droid4 transmits at 3.3V. Anyway, it now works for me well enough that I can attempt to debug the .config file :-). Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlqy2RoACgkQMOfwapXb+vJjUgCeKqb8hCT+VU9+XoIVeX3IIx53 1+MAn0jVnKsQ146uVvv5qelbCybwD4rh =kaaR -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--