From owner-freebsd-current@FreeBSD.ORG Wed Oct 1 04:46:10 2014 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id C8687DA5; Wed, 1 Oct 2014 04:46:10 +0000 (UTC) Received: from mailuogwdur.emc.com (mailuogwdur.emc.com [128.221.224.79]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mailuogwprd51.lss.emc.com", Issuer "RSA Corporate Server CA v2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 74FBB8F6; Wed, 1 Oct 2014 04:46:09 +0000 (UTC) Received: from maildlpprd56.lss.emc.com (maildlpprd56.lss.emc.com [10.106.48.160]) by mailuogwprd52.lss.emc.com (Sentrion-MTA-4.3.0/Sentrion-MTA-4.3.0) with ESMTP id s914jqV7029176 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 1 Oct 2014 00:45:54 -0400 X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd52.lss.emc.com s914jqV7029176 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=emc.com; s=jan2013; t=1412138754; bh=6R3iJ64XIxvqLoD1rLf35/11cww=; h=From:To:CC:Date:Subject:Message-ID:References:In-Reply-To: Content-Type:Content-Transfer-Encoding:MIME-Version; b=hI189R5zkyvyQ3sCp0XauTLqQbjaMa8W17SW6Clso7U947+mYA1WZg51dQ6tFjsdG pPdkaHkVCSzUYJ0QkX1QPmg/pNPYtaMu0al0C/9alzWBiTxwMY3pIY5eR/yFu04GvX x+jZnVDZGdJ69CPl0FGQDYARbT4eMBdVDWaeYZco= X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd52.lss.emc.com s914jqV7029176 Received: from mailusrhubprd03.lss.emc.com (mailusrhubprd03.lss.emc.com [10.253.24.21]) by maildlpprd56.lss.emc.com (RSA Interceptor); Wed, 1 Oct 2014 00:45:28 -0400 Received: from mxhub09.corp.emc.com (mxhub09.corp.emc.com [10.254.92.104]) by mailusrhubprd03.lss.emc.com (Sentrion-MTA-4.3.0/Sentrion-MTA-4.3.0) with ESMTP id s914jdAv010365 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 1 Oct 2014 00:45:39 -0400 Received: from mx34a.corp.emc.com ([169.254.1.46]) by mxhub09.corp.emc.com ([10.254.92.104]) with mapi; Wed, 1 Oct 2014 00:45:39 -0400 From: "O'Connor, Daniel" To: Julian Elischer Date: Wed, 1 Oct 2014 00:45:10 -0400 Subject: Re: What do you use for kernel debugging? Thread-Topic: What do you use for kernel debugging? Thread-Index: Ac/dMox5TpZy4R3cSbuYRe6Vn87ciQ== Message-ID: <90CE0701-F1CB-41DF-B3D2-87816DC03DF9@emc.com> References: <20140928071641.M7664@beckpeccoz.com> <20140929003358.M78145@aoek.com> <542AC1C8.9030101@freebsd.org> In-Reply-To: <542AC1C8.9030101@freebsd.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Sentrion-Hostname: mailusrhubprd03.lss.emc.com X-RSA-Classifications: public X-Mailman-Approved-At: Wed, 01 Oct 2014 04:56:06 +0000 Cc: =?Windows-1252?Q?Jos=E9_P=E9rez_Arauzo?= , FreeBSD Current , Benjamin Kaduk , Garrett Cooper X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Oct 2014 04:46:10 -0000 On 1 Oct 2014, at 0:14, Julian Elischer wrote: > Unfortunately you can't use a USB serial as it requires the USB stack=20 > be working before it can be used.. > similar with ethernet connected debugging which requires that the=20 > driver for the ethernet hardware support it. > (which why we don't have it in the tree though it has been done=20 > several times in the past). There IS a USB debug standard, Linux has some code to support it. I am not sure what percentage of hardware has it hooked up though (the host= controller has a designated debug port but it could physically be anything= ). http://www.coreboot.org/EHCI_Debug_Port The hardware is bit more expensive than a null modem or firewire cable thou= gh :( Regards, Daniel O=92Connor Senior Software Engineer Isilon Platforms Team