Date: Thu, 17 Feb 2005 10:31:29 +1030 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Gerald Heinig <gheinig@syskonnect.de> Cc: freebsd-current@freebsd.org Subject: Re: gdb over Firewire Message-ID: <20050217000129.GD69640@wantadilla.lemis.com> In-Reply-To: <420C76C3.202@syskonnect.de> References: <420C76C3.202@syskonnect.de>
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--OesXTvlsfeLEOFyS Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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? Sorry for the slow reply; I've been busy. No, it's not a current-only feature. It used to work, but I've had a lot of difficulty since the introduction of the new gdb framework. Try this: $ sysctl debug.kdb debug.kdb.available: ddb=20 debug.kdb.current: ddb debug.kdb.enter: 0 debug.kdb.stop_cpus: 1 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. Greg -- See complete headers for address and phone numbers. --OesXTvlsfeLEOFyS Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFCE97ZIubykFB6QiMRAq6MAJ9Q1f2hcpXJRPPd4Jjj/KtZSvgODwCgrtmn 5zEJwa9uhLf6gje6elC7pdU= =/RsL -----END PGP SIGNATURE----- --OesXTvlsfeLEOFyS--
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