Re: [Kgdb-bugreport] Use kgdb over a console terminal server?

[Jay L. <jl...@sg...>]

Jay Lan wrote:
> Jason Wessel wrote:
>> Jay Lan wrote:
>>> Hi Jason,
>>>
>>> I have a machine with its ttyS0 connected to a console terminal server.
>>> To access the console of my machine, i telnet to the TS with a specific
>>> port.
>>>
>>> I think i would need to use kgdboc in this setup? How should i specify
>>> the kdboc parameters in the boot command line?
>>>
>>> Thanks and regards,
>>>  - jay
>>>
>>>
>>>   
>> It is no different than if you had the board directly connected.
>>
>> Assuming your terminal server is connected at 115200 baud it looks like:
>>
>> kgdboc=ttyS0,115200
> 
> The system hangs on boot. I have these in the boot line:
>     console=ttyS0,38400n8 kgdboc=ttyS0,38400

Hi Jason,

Please disregard the above comment. The kernel was hung in running init,
not during booting the kernel. I need to find what caused this problem
in this particular system setup.

Now, i put in kgdbwait in the boot command line and the kernel stopped
and wait for gdb to connect. The documentation says to use the following
for connecting a terminal server:
    (gdb) target remote udp:192.168.2.2:6443

I replaced the ip with the ip of my terminal server, and the port number
with the port number when i connect to the console of the target system.

Still no connection! Does the system i run gdb on have to be on the same
subnet as the target system?  Hmm, i will find another system to test
tomorrow...

Thanks for your explanation, Jason!

Regards,
 - jay

> 
> It seems that above caused the system hung?
> 
> Thanks and regards,
>  - jay
> 
>> If you are using something the likes of a linux telnet client to connect
>> you would break into kgdb with:
>>
>> ## Press control and the right bracket to escape into telnet
>> <Control-]>
>> ## Now type in send break at the telnet prompt
>> send break
>> ## Now press the g key
>> g
>>
>> That will send sysrq and at that point you disconnect the telnet client
>> and connect gdb in its place.
>>
>> Jason.
> 
> 
> -------------------------------------------------------------------------
> Check out the new SourceForge.net Marketplace.
> It's the best place to buy or sell services for
> just about anything Open Source.
> http://sourceforge.net/services/buy/index.php
> _______________________________________________
> Kgdb-bugreport mailing list
> Kgd...@li...
> https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport