BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom [Thomas Lehwald <thomas.lehwald@Ruetz.de>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Fri Jun  1 02:27:38 2001
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From: Thomas Lehwald <thomas.lehwald@Ruetz.de>
To: "'rtl@fsmlabs.com'" <rtl@fsmlabs.com>
Subject: AW: [rtl] Fwd: Debugging a driver
Date: Fri, 1 Jun 2001 10:16:08 +0200 
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Hi,

it seems, you forgot to call the debugger (i.e. ddd or xxgdb) and then to
call the "dbg"-macro for communication via realtime fifos between debugger
and debuggee. A short description how to debug modules is found in the
rtlinux source tree under debugger.

Greetings 

Thomas

-----Ursprungliche Nachricht-----
Von: Linus Gasser [mailto:ineiti@gmx.net]
Gesendet: Donnerstag, 31. Mai 2001 16:37
An: rtl@rtlinux.org
Betreff: [rtl] Fwd: Debugging a driver


Hi,
I have a rtl-module here that acts as a driver, but with the need for
real-time (in fact it's a DAC for a software radio). Now and then the module
goes 'whoops' and takes the whole computer with, sometimes there's 'just' an
exception. In both cases I'm stuck and have to reboot the computer (either
with the reset-knob or with a 'reboot'). I tried to get the rtl_debug module
working, but it doesn't drop in the driver-module. I tried the following:

- Adding breakpoint() in one of the driver's routines
- modprobe rtl_debug
- insmod daq_module.o
- start the application that uses the driver (and calls the routine with the
breakpoint() in it)
->
kernel: Unable to handle kernel paging request at virtual address dc3daa60
kernel:  printing eip:
kernel: d08d10bb
kernel: *pde = 00000000
kernel: Oops: 0000
kernel: CPU:    1

and no notification of the rtl_debug module whatsoever.
 Did someone already debug a rtl-kernel-driver, and if so, how?

Thanks for considering my mail,

Ineiti

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