Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.embedded > #355

Re: memory protection in linux kernels

Cross-posted to 2 groups.

Show all headers | View raw

"Scott Lurndal" <scott@slp53.sl.home> wrote in message 
news:R2Wfs.9$726.7@fed11.iad...
>>> Turn on CONFIG_KDB and use kdb to set a watchpoint on the location being
>>> corrupted.   The processor will automatically stop and drop into kdb
>>> when the location is modified.
>>>

[skip]
>>Thank you. The target is ARM-based and runs the kernel 2.6.31.8, which has
>>only KGDB support, i.e. as I understand it allows to debug via rs232. What
>>is the difference with KDB?
>
> KDB is built in; it doesn't require a client on another machine like KGDB;
> but kgdb should work for your case since you've an earlier kernel.
>

After googling and reading I've set up kgdb over serial line, I can break 
into the debugger (by stopping the kernel via /proc/sysrq-trigger) and 
connect from host gdb, which is part of ARM toolchain.

Basically I have development board running embedded linux abd the driver I'm 
debugging, and my PC with two connections to the board - serial and ethernet 
(telnet session).

After I connect with host gdb to the target, I'm no longer able to do telnet 
to the board, because the only way to reproduce the memory corruption is to 
apply some configuration with user application on the board.

Is it expected or I'm doing something wrong, and there's a way to have alive 
IP connection to the target *and* GDB session?

Mark 

Back to comp.os.linux.embedded | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

memory protection in linux kernels "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-10-17 17:32 -0400
  Re: memory protection in linux kernels scott@slp53.sl.home (Scott Lurndal) - 2012-10-18 13:53 +0000
    Re: memory protection in linux kernels "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-10-18 11:57 -0400
      Re: memory protection in linux kernels scott@slp53.sl.home (Scott Lurndal) - 2012-10-18 16:24 +0000
        Re: memory protection in linux kernels "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-10-19 18:08 -0400
          Re: memory protection in linux kernels Ian Collins <ian-news@hotmail.com> - 2012-10-20 12:29 +1300
          Re: memory protection in linux kernels scott@slp53.sl.home (Scott Lurndal) - 2012-10-20 19:49 +0000
      Re: memory protection in linux kernels Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-10-18 17:56 +0100

csiph-web