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Reload this Page device driver problem
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The Linux Kernel Compiling, theory, programming or other discussion about the linux kernel

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Old 05-14-2008   #1 (permalink)
jlam
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device driver problem
I try to write a device driver for usb device. However, I use
Code:
printk(".....");
It cannot print any message in terminal.

Anyone can tell me why? and how can I print the debug message on terminal for device driver?

Thanks!
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Old 05-14-2008   #2 (permalink)
bobescalin2005
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What language are you using for writing driver for devices?
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Old 05-14-2008   #3 (permalink)
jlam
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C language~
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Old 05-15-2008   #4 (permalink)
digvijay.gahlot
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printk doesn't print messages on X Windows. Press Ctrl + Alt + F1 and login to your account. Here you can see printk work.
If priority of message is less than default console log level then also it is not displayed. You can increase priority by using KERN_ALERT tags in front. eg
printk(KERN_ALERT "This will be displayed\n");
All your printk are stored in /var/log/messages even if they are not printed.
Visit here to know more:-
https://lwn.net/images/pdf/LDD3/ch04.pdf
Page 4
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