Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752492AbaFFWH4 (ORCPT ); Fri, 6 Jun 2014 18:07:56 -0400 Received: from mail-ve0-f181.google.com ([209.85.128.181]:58978 "EHLO mail-ve0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752458AbaFFWHz convert rfc822-to-8bit (ORCPT ); Fri, 6 Jun 2014 18:07:55 -0400 MIME-Version: 1.0 Date: Fri, 6 Jun 2014 15:07:54 -0700 Message-ID: Subject: Garbage characters on serial console (Linus "next") From: Tony Luck To: Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pulled from Linus' "next" branch (HEAD = 2b03adc1911d1c84cb7fad8b424234f589547cb3) and built & booted on ia64. I see a lot of random characters on the serial console. Suspiciously starting right after reporting the serial line has been found. Here's what the output looks like when I "vi" the saved file: io scheduler noop registered^M io scheduler deadline registered^M io scheduler cfq registered (default)^M pci_hotplug: PCI Hot Plug PCI Core version: 0.5^M Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled^M 00:02: ttyS0 at I/O 0x3f8 (irq = 44, base_baud = 115200) is a 16550A^M <80>^\þÇ^@üþ^\à^\<8c>àüðð^\<80><80>üðøþ<80>à<8e>^@üà^\àðÀ<80>^@<8e>à^@à<80><80>^\^\ÿ^\^@^\þþà^@à^\ðð^\<80><80>üþ<80>ü<80>þðøüà<8e>^\à<80>ð^@ÿ<80>üðà^@à<8e>ð<80><80><80><80>þðþ<80>üþ^\à^\^\<80>þÇü^\øà<8e>^@^\à^\^\^\ð<8e><80>ðà<8e><80>^\^@^@^\^\<8e><8e>^\àþþ^\<8e>^@^\<80>^@þ^\ÿ^\à<80>^@^\^\ø^\^\à^L^@<8e>ð^\<80>^\^\ü^\ø^\ÿ Output continues with alternating blocks of legible text and garbage. System eventually boots (with a legible "login:" prompt). -Tony -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/