Date: Sun, 29 Aug 2004 18:47:13 -0700 (PDT) From: Jiafu He <jiafu_he@yahoo.com> To: Rob Deker <deker@slackdot.org>, freebsd-hackers@freebsd.org Subject: Re: Serial consoles and remote GDB Message-ID: <20040830014713.39877.qmail@web53310.mail.yahoo.com> In-Reply-To: <1093817592.8552.90.camel@nyx.slackdot.org>
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--- Rob Deker <deker@slackdot.org> wrote: > Hi folks, > > New to the list, so please bear with me if this is a question that's > been answered someplace before. I've been searching and can't seem to > find an answer. > > I'm doing some driver hacking w/ FreeBSD 5.2.1 and I've hit a spot > where > my life would be much easier if I had remote GDB for kernel > debugging. I > am however using a serial console on this box, and can't seem to get > things working so that I have console access to the box on one serial > port and remote gdb running on the other one. Is this possible? I've > tried various combinations of port flags for sio[01] in the > device.hints > file, but I'm not having much luck. I've tried toe following > combinations (with the following results): > > - hint.sio.0.flags="0x10" > hint.sio.1.flags="0x80" > > This yeilded a console initially at boot, but one I told the > loader > to go ahead and boot the kernel, all I got for output were repeated > 0x8e > chars (looks like an accented capital 'A'). > > so, i figured that it might possibly be that the lowest numbered port > should be the one with 0x80 set in flags, so I tried: > > - hint.sio.0.flags="0x80" > hint.sio.1.flags="0x10" > > This got me (again) a console up until kernel load, but after that > I > had NO output at all. > > I'm open to any suggestions. My problem is that the machines that are > the debug target and debug host are in my basement headless while my > office is upstairs and I really would like to avoid running up and > down > stairs every time I need to switch in and out of gdb mode in ddb (no > matter how much I might need the exercise ;) > Well. Would you try add one line "set console=comconsole" at the very beginning of /boot/loader.rc? JF __________________________________ Do you Yahoo!? Yahoo! Mail is new and improved - Check it out! http://promotions.yahoo.com/new_mail
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