Serial consoles and remote GDB

[Jiafu He]

--- Rob Deker <deker at 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




		
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