Re: [ECOS] gdb remote debug problem

[elf at florence dot buici dot com]

On Thu, Apr 26, 2001 at 06:52:34AM -0400, Weilong Li wrote:
> Elf, thanks a lot for help.
> 
> I just discovered the problem. The target machine is so old that its serial
> port
> is rusted, and I tried anoter target, it is working.

Rusted.  Wow.

> 
> Weilong
> 
> elf@florence.buici.com wrote:
> 
> > I've done exactly the same thing with success. I encountered some odd
> > behavior when I didn't use exactly the software versions recommended
> > by the eCos team.  I used:
> >
> >   binutils-2.11.90.0.1
> >   gcc-core-2.95.2
> >   gcc-g++-2.95.2
> >   insight-5.0
> >
> > though the behavior you describe seems to indicate that the tools are
> > correctly built.
> >
> > The most important thing to check is that your serial connection is
> > correct.  It is worthwhile to use minicom (or a similar package) to
> > test the physical, serial link.
> >
> >  -*-
> >
> > [deletia]
> >
> > > 3) Then I used the floppy disk to boot another computer, it is
> > > intel 486 machine, I connected it with my intel redhat 7.0 machine using
> > >
> > > a null modem cable. I saw the following things show on intel 486
> > > machine:
> > >
> > > ++$T0508:a4370000;04:e00f0000;#19++$T0508:a43700019
> > >
> > > So it seems the gdb stub on my target machine is working.
> > > Then on intel redhat 7.0 machine, under directory
> > > /opt/ecos/ecos-1.3.1/examples,
> > > I typed i386-elf-gdb -nw hello, then the following shows:
> > >
> > > GNU gdb 5.0
> > > Copyright 2000 Free Software Foundation, Inc.
> > > GDB is free software, covered by the GNU General Public License, and you
> > > are
> > > welcome to change it and/or distribute copies of it under certain
> > > conditions.
> > > Type "show copying" to see the conditions.
> > > There is absolutely no warranty for GDB.  Type "show warranty" for
> > > details.
> > > This GDB was configured as "--host=i586-pc-linux-gnu
> > > --target=i386-elf"...
> > > (gdb) set remotebaud 38400
> > > (gdb) target remote /dev/ttyS0
> > > Remote debugging using /dev/ttyS0
> > > Ignoring packet error, continuing...
> > > Ignoring packet error, continuing...
> > > Ignoring packet error, continuing...
> > > Couldn't establish connection to remote target
> > > Malformed response to offset query, timeout
> > > (gdb) load
> > > You can't do that when your target is `exec'
> > >
> > > If I type i386-elf-gdb hello instead,
> > > the graphic window shows up since I installed insight,
> > >
> > > I saw the source code of atexit.cxx is shown in the window, under Run
> > > menu,
> > > I click on "connect to target" menuitem, and set target be "remote
> > > serial",
> > > and baud rate is 38400, and port is /dev/ttyS0, I clicked Ok, nothing
> > > happens,
> > > then I click "connect to target" menuitem under Run menu again, then
> > > a dialog shows "Successfully connected". Then I click on "ok" button on
> > > this
> > > dialog, but the insight will exit and shows me "segmentation fault".
> > >
> > > Anyway, I cannot connect to the target to do remote debugging, I guess
> > > there is something wrong with physical connection to the target machine.
> > >
> > > On the host (intel Redhat 7.0 machine), there are two ports with D9
> > > interface, I don't know how to distinguish between com1 and com2, so I
> > > just tried both of them, and got the same results above.(on my target
> > > machine,
> > >  there is only one D9 interface).
> > >
> > >
> > > Please tell me what is wrong and what should I do so that I can
> > > do remote debugging. thanks a lot.
> > >
> > >