Date: Thu, 17 Feb 2005 10:51:09 +0800 (CST) From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: gdb over Firewire Message-ID: <0502171047593.63470@www.mmlab.cse.yzu.edu.tw> In-Reply-To: <20050217024644.GQ69640@wantadilla.lemis.com> References: <420C76C3.202@syskonnect.de> <20050217000129.GD69640@wantadilla.lemis.com> <20050217024644.GQ69640@wantadilla.lemis.com>
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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).
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