Re: Remote target behind console server

["KONG, Gangfeng" <gkong@IPRG.nokia.com>]

>
> >
> > In order to check the whole system, I did install a kgdb stub of linux 
> on my
> > laptop, so that I can move it around. What I have done are:
> > 1. enable the /dev/ttyS0 in /etc/inittab, then I can login through 
> serial port
> >      the check whether it works. I connect it to the port 1 of my console
> > server,
> >      then, I remotely login into it by 'telnet server-ipaddr 2001'. Works!
> >      SO:
> >          - target serial port works
> >          - console server works
> > 2. I move the laptop target close to my development box, and I use 
> serial cable
> >      to connect them directly. I start the stub on target by 'gdbstart -s
> > 38400 -t
> >      /dev/ttyS0'. And then start the gdb on the development box. Now I 
> can use
> >      gdb to debug my target box as expected.
> >      SO:
> >          - the stub on target is ok
> >          - the gdb on the development box is ok
>
>
>I suppose that you are using null-modem cable at the point.

Yes.



> > 3. Now I move the laptop target back to the console server and connect 
> the port
> >      1 to its serial port and start the stub by 'gdbstart -s 38400 -t
> > /dev/ttyS0', and
> >      go the development box to start the gdb and try to access the target
> > box by
> >      'target remote server-ipaddr:2001'.
> >      But it fails......
> >
> > I don't know what's wrong.
>
>I suppose port configuration or wrong cable or wrong baud rate, I
>suppose you have to use stright cable here and in many cases authobaud
>feature does not work with gdb stub.
>
>Anyway, connect you rtarget to the terminal server, start gdb stub, do
>'telnet serverip 2001' and try to figure out what is going wrong until
>you see '$...#yy in response to pressing ENTER.

Hi,

You are definitely right. The baudrate is wrong, the console server seems not
to be able to auto-configure the baudrate of its ports. I use your suggestion
'telnet serverip 2001' to talk to every possible baudrate of the target from
9600 to 115200. I can not get '$...#yy' reply in any baudrate. But 9600 set 
did give
a me persistent reply '$s05#b8', all of the other baudrate set gave me a series
of changing replies. Late I tried 'target remote serverip:2001' with a 9600 
baudrate
stub. I works!

Thank you very much for your help, I understand it better now!
GF