From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: First steps with my Google Nexus-4 Date: Tue, 19 Jul 2016 09:47:10 +0200 Message-ID: <2412508.u5uv44vaGg@wuerfel> References: <8a85a158-a4f9-4ba5-0879-417f81370a19@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: Received: from mout.kundenserver.de ([217.72.192.75]:56813 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752904AbcGSHrX (ORCPT ); Tue, 19 Jul 2016 03:47:23 -0400 In-Reply-To: <8a85a158-a4f9-4ba5-0879-417f81370a19@redhat.com> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: Jeremy McNicoll Cc: sedat.dilek@gmail.com, Rob Clark , Stanimir Varbanov , Andy Gross , David Brown , linux-arm-msm@vger.kernel.org, John Stultz , Bjorn Andersson On Monday, July 18, 2016 7:06:49 PM CEST Jeremy McNicoll wrote: > > > > [1] https://android.googlesource.com/device/google/debugcable/ > > [2] http://www.contextis.com/resources/blog/kgdb-android-debugging-kernel-boss/ > > [3] http://www.pabr.org/consolejack/consolejack.en.html > > [4] http://www.offene-werkstaetten.org/werkstatt/fablab-neckar-alb-e-v > > [5] http://tuebingen.linux.de/ > > [6] http://people.redhat.com/jmcnicol/nexus_debug/ > > No soldering needed, as its a skill I do not have. ;-) That sounds like it would grill the rx line, as the FTDI breakout board you use supplies 3.3v while the expected input is 1.8v. As I understand it, you want to supply 3.3v to the microphone line for detection but then run the rx/tx lines at 1.8v. I have not built one of those cables myself yet, so I'm not sure. It probably works using 3.3v, at least for a while, but there is a significant risk of damaging the hw. Arnd