How to enable dev_dbg messages

Stefan Gachter

Could somebody explain to newbie like me how to enable the dev_dbg messages as defined in device.h? I understand that the DEBUG variable must be set, but enabling various options in "Kernel hacking" of menuconfig was not successful so far. If I manually define DEBUG in device.h, then I get the compile error that (dev)->driver is not defined. Enabling dev_dbg would it make much easier for me to understand what is going on, because I get a "Division by zero in kernel" error after a "VIDIOC_STREAMON" ioctl and have not yet a clue what the cause is...

Thanks for any hint.

Stefan

over 15 years ago

0 Juan Gonzales over 15 years ago

TI__Mastermind 37340 points

I used dev_dbg a long time ago, but I believe I just had to define DEBUG at the top of the C file which I was debugging.

Also, the following wiki may be helpful: http://wiki.davincidsp.com/index.php/FAQ_for_DaVinci_Linux (though I have not tried this).

0 Stefan Gachter over 15 years ago in reply to Juan Gonzales

Intellectual 450 points

Thanks Juan. Define DEBUG at the top of the driver file (*.c file) in question might work. I ended up copying the definition of dev_dbg at the top of the driver file and then recompiled the kernel, and it worked fine.

Stefan

Processors

Processors forum

How to enable dev_dbg messages