Re: opening the serial port from userspace application

On Wed, 1 Feb 2006 00:24:19 -0800 (PST)
bharathi kandimalla [off-list ref] wrote:

Hi
I am able to  use the serialport uart drivers  for the custom board with =

mpc860T=20

 which are available in the kernel 2.6.13 =20
I am getting bootup messages like this
  ttyCPM0 at MMIO 0xfb000a80 (irq =3D 20) is a CPM UART
ttyCPM1 at MMIO 0xfb000a90 (irq =3D 19) is a CPM UART
ttyCPM2 at MMIO 0xfb000a00 (irq =3D 46) is a CPM UART
ttyCPM3 at MMIO 0xfb000a20 (irq =3D 45) is a CPM UART =20

=46rom what I can see, you have misconfigured something. Dunno for certain, b=
ut 860T=20
might have 2 UARTs, when you have at least 4 enabled. Please enable in the =
kernel configuration only those which exist on your board.

   And after getting prompt
cd /proc/dev/    =20
cat drivers
/dev/tty             /dev/tty        5       0 system:/dev/tty
/dev/console         /dev/console    5       1 system:console
/dev/ptmx            /dev/ptmx       5       2 system
ttyCPM               /dev/ttyCPM   204 46-49 serial
pty_slave            /dev/pts      136 0-1048575 pty:slave
pty_master           /dev/ptm      128 0-1048575 pty:master=20
  I am  using mknod command=20
mknod /dev/ttyCPM0 c 204 46=20
    ln -sf  console ttyCPM0=20
mknod /dev/ttyCPM1 c 204 47
mknod /dev/ttyCPM2 c 204 48
mknod /dev/ttyCPM3 c 204 49 =20
  even I am not able to open the device from the user space application
  I want to write some data from the user space into the
application
But I am not able to open the device
  please help me out
regards
Bharathi=20
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	=09
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--=20
Sincerely,=20
Vitaly