Date: Mon, 29 Sep 2014 02:51:01 +0200 From: "=?UTF-8?Q?Jos=C3=A9_P=C3=A9rez_Arauz?=o" <fbl@aoek.com> To: Benjamin Kaduk <kaduk@MIT.EDU> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: What do you use for kernel debugging? Message-ID: <20140929003358.M78145@aoek.com> In-Reply-To: <alpine.GSO.1.10.1409281553060.21571@multics.mit.edu> References: <20140928071641.M7664@beckpeccoz.com> <alpine.GSO.1.10.1409281553060.21571@multics.mit.edu>
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Hi Benjamin, On Sun, 28 Sep 2014 15:54:36 -0400 (EDT), Benjamin Kaduk wrote > On Sun, 28 Sep 2014, José Pérez Arauzo wrote: > > > Hello, > > I am trying to track down a (deadlock?) issue in CURRENT via DDB. The kernel does > > not complete hw probes on my Acer V5. > > > > I get stuck on apic_isr looping which leads nowhere. > > > > So I thought maybe things improve if I debug from another machine. > > > > > > What do you use for kernel debugging? According to the handbook kgdb over serial > > is a good option, do you agree? I'm on a netbook with no ethernet and no option > > for firewire: can I have a USB / nullmodem setup to work? > > You cannot. Oh, what a shame. Why not? Is it because you need hardware probe to be over to use it? Today I bought a shining USB to USB thingy made by Hama, and guess what? It's not supported on FBDS, altought uplcom(4) reports support for Hama USB to RS232 brother. > > I have no old-style uarts hardware anymore, as the handbook suggests... > > > > Any idea is welcome before I buy extra hw. I have a USB to serial showing up as > > /dev/cuaU0, do I need to grab another one and a nullmodem cable or there are better > > alternatives? Thank you. > > I'm not sure that there are alternatives at all, unfortunately. > > You may be reduced to debugging-via-printf. Wow, bad news! :-| BR, -- José Pérez Arauzo
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