On Fri, Jan 8, 2010 at 11:46 AM, Durga Prasad <[email protected]> wrote:
> Run strace to cat.
> You will know what is causing the error.
> Can you post the code?
> Regards
> Durga
> ________________________________
> From: Sam Carter <[email protected]>
> To: kernelnewbies <[email protected]>
> Sent: Thu, January 7, 2010 7:01:20 AM
> Subject: 'No such device or address' when writing to device driver
>
> Hi all,
>
> I'm trying to write a simple char driver following the 'Linux Device
> Drivers' book from O' Reilly. My driver appears in /proc/devices and under
> lsmod. I've been trying to register the device fops table so I can
> read/write to it, however when I try to cat some data to it in /dev/myDevice
> I get the error 'No such device or address'. The device does appear on the
> list with ls /dev/.
>
> Can anyone help me find the source of this problem? Thanks in advance.
>
The very first check...
#1 cat /proc/devices | grep <your_driver>
#2 ls -l /dev/<your_device> and get the the major number
Both must match !!!
> Sam
>
>
--
Regards,
Sandeep.
“To learn is to change. Education is a process that changes the learner.”
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