ttyS0 ttyS1

ttyS0 ttyS1

[oparz]

Hello,
i have problems to use ttyS1 on my TQM885 Board.

fd1 = open("/dev/ttyS0",O_RDWR);
fd2 = open("/dev/ttyS1",O_RDWR);

I have expected to get different filehandles, but
both handles for ttyS0 and ttyS1 are 0! 

Any help is very appreciated.

_____________________
Dr. Otto Parzhuber
Munich University of Applied Sciences
Fac. of Precision Engineering

RE: ttyS0 ttyS1

[Charles Krinke]

Dear Otto:
=20
You might check that the dev entry points in your root file system for =
/dev/tty, /dev/console, /dev/ttyS0 and /dev/ttyS1 all exist. They must =
be created with mknod and not with mkdir.=20
=20
These are the settings you should see with an 'ls' of the target's root =
filesystem on the host which has created it. All of these entries should =
be character devices as shown by the first bit of the permissions being =
a 'c'.
=20
/dev/console 5 1
/dev/tty 5 0
/dev/ttyS0 4 64
/dev/ttyS1 4 65
=20
Charles Krinke

________________________________

From: linuxppc-embedded-bounces+ckrinke=3Distor.com@ozlabs.org on behalf =
of oparz@compuserve.de
Sent: Fri 3/23/2007 3:43 AM
To: linuxppc-embedded@ozlabs.org
Subject: ttyS0 ttyS1



Hello,
i have problems to use ttyS1 on my TQM885 Board.

fd1 =3D open("/dev/ttyS0",O_RDWR);
fd2 =3D open("/dev/ttyS1",O_RDWR);

I have expected to get different filehandles, but
both handles for ttyS0 and ttyS1 are 0!

Any help is very appreciated.

_____________________
Dr. Otto Parzhuber
Munich University of Applied Sciences
Fac. of Precision Engineering





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ttyS0 ttyS1

[oparz]

Hello Charles,
thank you, but the dev entries are correct (created with mknod:)

root@/># ls -l ttyS*
crw------- 1 0 0 4, 64 Jun 7 2005 ttyS0
crw------- 1 0 0 4, 65 Jun 7 2005 ttyS1

following is a part of dmesg output:
....
CPM UART driver version 0.04
ttyS0 at 0x0280 is on SMC1 using BRG1
ttyS1 at 0x0380 is on SMC2 using BRG2
....

the serial interface ttyS0 is working properly...but ttyS1 is responding
to the same pins as ttyS0

best regards
otto

\0

Re: ttyS0 ttyS1

[Dan Malek]

On Mar 23, 2007, at 3:43 AM, <oparz@compuserve.de>  
<oparz@compuserve.de> wrote:

> Hello,
> i have problems to use ttyS1 on my TQM885 Board.
>
> fd1 = open("/dev/ttyS0",O_RDWR);
> fd2 = open("/dev/ttyS1",O_RDWR);

If you are using 2.6 kernels....
/dev/ttyCPM0 and /dev/ttyCPM1

Otherwise, ensure additional serial ports are
configured in your kernel and the device nodes
exist.



	-- Dan