From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752488AbaGKCaZ (ORCPT ); Thu, 10 Jul 2014 22:30:25 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.229]:5549 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751999AbaGKCaY (ORCPT ); Thu, 10 Jul 2014 22:30:24 -0400 Date: Thu, 10 Jul 2014 22:30:21 -0400 From: Steven Rostedt To: LKML , linux-arm-kernel@lists.infradead.org Cc: Lee Jones , Linus Walleij , Tuomas Tynkkynen Subject: No uart output on my snowball board Message-ID: <20140710223021.6e9c857f@gandalf.local.home> X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.23; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.142:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I decided to play with my snowball board as that's the easiest arm board I have to do testing on, and it was reported to me that I broke function graph tracing on the arm boards. But I haven't booted my snowball since 3.8. When I tried with the latest kernel, it didn't give me *any* output. I figured something was up with the uart, but the board also didn't boot. I did a bisect to find out where the uart stopped working (I also stumbled on where the board stopped booting, but still need to find that commit). The uart died with this commit: commit a0998b8321eb5f53ef51924f5ab6c69237ac1025 Author: Lee Jones Date: Thu Aug 22 16:18:56 2013 +0100 ARM: ux500: Remove UART support when booting without Device Tree It's time to remove all ATAG support from ux500 and rely solely on Device Tree booting. This patch is part of that endeavour. Signed-off-by: Lee Jones Signed-off-by: Linus Walleij This happened between 3.12 and 3.13. Does this mean that I need to get device tree support for this. I have no idea how to fix it as a device tree to me is a christmas tree (a tree with little lighty devices on it). Thus I'll just go and throw this out at you. Thanks, -- Steve