From owner-freebsd-hackers@FreeBSD.ORG Wed Jul 23 01:46:02 2014 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 40251149 for ; Wed, 23 Jul 2014 01:46:02 +0000 (UTC) Received: from dmz-mailsec-scanner-3.mit.edu (dmz-mailsec-scanner-3.mit.edu [18.9.25.14]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D04EF2E44 for ; Wed, 23 Jul 2014 01:46:01 +0000 (UTC) X-AuditID: 1209190e-f79946d000007db1-7b-53cf12a489bb Received: from mailhub-auth-4.mit.edu ( [18.7.62.39]) (using TLS with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by dmz-mailsec-scanner-3.mit.edu (Symantec Messaging Gateway) with SMTP id 6A.0C.32177.4A21FC35; Tue, 22 Jul 2014 21:40:52 -0400 (EDT) Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by mailhub-auth-4.mit.edu (8.13.8/8.9.2) with ESMTP id s6N1eq08015206; Tue, 22 Jul 2014 21:40:52 -0400 Received: from multics.mit.edu (system-low-sipb.mit.edu [18.187.2.37]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.13.8/8.12.4) with ESMTP id s6N1eobi005432 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 22 Jul 2014 21:40:51 -0400 Received: (from kaduk@localhost) by multics.mit.edu (8.12.9.20060308) id s6N1eoGt018926; Tue, 22 Jul 2014 21:40:50 -0400 (EDT) Date: Tue, 22 Jul 2014 21:40:49 -0400 (EDT) From: Benjamin Kaduk X-X-Sender: kaduk@multics.mit.edu To: Nidal Khalil Subject: Re: freebsd-hackers Digest, Vol 588, Issue 1 In-Reply-To: Message-ID: References: User-Agent: Alpine 1.10 (GSO 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmleLIzCtJLcpLzFFi42IRYrdT110idD7Y4OgrY4vtm/8xWjx6foLR gcljxqf5LB47Z91lD2CK4rJJSc3JLEst0rdL4Mo4NHU+W8F01opLM2cxNTBOYOli5OSQEDCR OLr0BxuELSZx4d56MFtIYDaTxK+f+V2MXED2RkaJN23P2CGcQ0wSiyc9Z4VwGhgltm9+yNzF yMHBIqAtcbolE6SbTUBN4vHeZlaIqYoSm09NAisREVCReDs9HyTMLCAvcWHzIUaQsLCAqcSu U64gYU6BQIl7XVPAbuMVcJT4uOYu1NpzjBK3970ES4gK6Eis3g9TJChxcuYTFoiZlhLn/lxn m8AoNAtJahaS1AJGplWMsim5Vbq5iZk5xanJusXJiXl5qUW6xnq5mSV6qSmlmxhB4cspybeD 8etBpUOMAhyMSjy8BTXngoVYE8uKK3MPMUpyMCmJ8noKnA8W4kvKT6nMSCzOiC8qzUktPsQo wcGsJMIb3QpUzpuSWFmVWpQPk5LmYFES531rbRUsJJCeWJKanZpakFoEk5Xh4FCS4D0rCDRU sCg1PbUiLTOnBCHNxMEJMpwHaPh3kBre4oLE3OLMdIj8KUZdjkX7X3YzCbHk5eelSonzHgW5 TgCkKKM0D24OLO28YhQHekuY9wXIKB5gyoKb9ApoCRPQkqLM0yBLShIRUlINjJYTPn/dd1tO 1Pje1W8LWDPXTpl291XbdIfF6x2mRr5duIF/z7F4td0Lfk455PnqWsPOoGdv+r9ty7x5VZnt DtO1GuHZMmmi74x3WlteOPy0Y6+g88K965mzNdX155fJuf6NW6qdLfk7v8G020Yhy6cxQ7R8 QecVb8a3kismsAn+cNS6JnfkwkElluKMREMt5qLiRACwLOB3FgMAAA== Cc: freebsd-hackers@freebsd.org X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Jul 2014 01:46:02 -0000 On Tue, 22 Jul 2014, Nidal Khalil wrote: > Hello All, > OK, I was able to capture the early boot output by entering ddb > GDB: no debug ports present > KDB: debugger backend; ddb > > My pc does not have a serial port. However I am using usb to serial by > Prolific Tech. > You mean to tell me that the kernel gdb shim is hardwired to /dev/cuau0? It is not hardwired to that exact device node, but yes, a USB-to-serial adapter will not work for it. A firewire port is also supposed to be usable for remote kernel debugging, as documented at http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-dcons.html -Ben