From owner-freebsd-current@FreeBSD.ORG Thu Feb 17 02:54:11 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 391C816A4CE for ; Thu, 17 Feb 2005 02:54:11 +0000 (GMT) Received: from blackwater.lemis.com (wantadilla.lemis.com [192.109.197.135]) by mx1.FreeBSD.org (Postfix) with ESMTP id D1A9A43D1D for ; Thu, 17 Feb 2005 02:54:09 +0000 (GMT) (envelope-from grog@lemis.com) Received: by blackwater.lemis.com (Postfix, from userid 1004) id F30778565C; Thu, 17 Feb 2005 13:24:07 +1030 (CST) Date: Thu, 17 Feb 2005 13:24:07 +1030 From: Greg 'groggy' Lehey To: Tai-hwa Liang Message-ID: <20050217025407.GR69640@wantadilla.lemis.com> References: <420C76C3.202@syskonnect.de> <20050217000129.GD69640@wantadilla.lemis.com> <050217104048D.63322@www.mmlab.cse.yzu.edu.tw> <20050217024644.GQ69640@wantadilla.lemis.com> <0502171047593.63470@www.mmlab.cse.yzu.edu.tw> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="KsUBxXnnTURmGdap" Content-Disposition: inline In-Reply-To: <0502171047593.63470@www.mmlab.cse.yzu.edu.tw> User-Agent: Mutt/1.4.2.1i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 cc: Gerald Heinig cc: freebsd-current@freebsd.org Subject: Re: gdb over Firewire X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Thu, 17 Feb 2005 02:54:11 -0000 --KsUBxXnnTURmGdap Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thursday, 17 February 2005 at 10:51:09 +0800, Tai-hwa Liang wrote: > On Thu, 17 Feb 2005, Greg 'groggy' Lehey wrote: >> On Thursday, 17 February 2005 at 10:43:44 +0800, Tai-hwa Liang wrote: >>> On Thu, 17 Feb 2005, Greg 'groggy' Lehey wrote: >>>> On Friday, 11 February 2005 at 10:11:31 +0100, Gerald Heinig wrote: >>>>> Hello Current'ers, >>>>> >>>>> I'm trying to get two-machine kernel debugging over Firewire working, >>>>> unfortunately without much luck so far. dconschat over Firewire works >>>>> fine, but gdb won't attach, complaining about get_tty_state failed, >>>>> among other things. >>>>> Is kernel gdb over Firewire a -current-only feature? >>>> >>>> >>>> That's what I get, and it indicates that I don't have gdb capability. >>>> If that's what you get, try building a kernel with firewire support >>>> built-in (as opposed to the (recommended) method of loading the >>>> firewire klds later). The background here is the hypothesis that the >>>> kernel checks for debug back-ends at boot time, and not later, so if >>>> you load the firewire klds later, it won't be registered. >>>> Note that this is a hypothesis. If you try this, please let us know >>>> what happens. >>> >>> From my observation, only "device dcons" is necessary to be static >>> linked in kernel, the rest such like firewire.ko and dcons_crom.ko >>> can still be dynamically loaded. >> >> So you're saying that this approach works for you where it has failed >> otherwise? > > Exactly. It looks like that your hypothesis is right: dcons only > does gdb backend registration during boot time(by static linked > approach). Thanks. Good to know. -- See complete headers for address and phone numbers. --KsUBxXnnTURmGdap Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFCFAdPIubykFB6QiMRAgSvAKCmqb5WUAnWHNjncEAuIRKhaZzWiwCeLL7V frXt9S2JOGF6OFypqUPOmvs= =2jm0 -----END PGP SIGNATURE----- --KsUBxXnnTURmGdap--