On Fri, Jan 8, 2010 at 11:46 AM, Durga Prasad <writexdp@xxxxxxxxx> wrote: > Run strace to cat. > You will know what is causing the error. > Can you post the code? > Regards > Durga > ________________________________ > From: Sam Carter <sam.w.carter@xxxxxxxxx> > To: kernelnewbies <kernelnewbies@xxxxxxxxxxxx> > 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.” -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
