RE: using SCC4 on MPC8272ADS

I am now using kernel 2.6.10.2 on the MPC8272ADS.

I still have problems using the second SCC port (SCC4).

If I do the following (assuming after configuring SCC4 to behave like SCC=
1 w/baud rate, etc using tcgetattr and tcsetattr):

echo hello > hhh
echo hello >> hhh
echo hello >> hhh

more hhh > /dev/ttyCPM1

then it works fine and I see the three lines of "hello" on the second por=
t.

But if I do:

echo hello > hhh
echo hello >> hhh
more hhh > /dev/ttyCPM1

(i.e., only two lines of "hello" in hhh)
then the system hangs.

-----Original Message-----
From: Vitaly Bordug [mailto:vbordug@ru.mvista.com]
Sent: Wednesday, September 21, 2005 3:01 PM
To: Landau, Bracha
Subject: Re: using SCC4 on MPC8272ADS


Landau, Bracha wrote:

Which version has the fix? 2-6-10-rc7? Where can I find it?

http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.2.tar.bz2
2.6.13.rc7 should have the fix.

=20
-----Original Message-----
From: Vitaly Bordug [mailto:vbordug@ru.mvista.com]
Sent: Wednesday, September 21, 2005 2:40 PM
To: Landau, Bracha
Cc: linuxppc-embedded list
Subject: Re: using SCC4 on MPC8272ADS
=20
=20
Landau, Bracha wrote:
=20

quoted

I reconfigured the kernel so that only SCC1 and SCC4 are supported. The=

 same thing happens as before.

quoted

Another bit of info is that if I run with console=3DttyCPM1 as a kernel=

 command line parameter, so that u-boot outputs to one port and the kerne=
l outputs to the other, if I type "ls > /dev/ttyCPM0" the system hangs.

quoted

=20
=20
Heh, didn't noticed, that you should use the latest rc of the linux=20
kernel. I used to fix second UART in rc7 AFAIR.
=20

quoted

-----Original Message-----
From: Vitaly Bordug [mailto:vbordug@ru.mvista.com]
Sent: Wednesday, September 21, 2005 1:56 PM
To: Landau, Bracha
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: using SCC4 on MPC8272ADS


Landau, Bracha wrote:

quoted

I am using the MPC8272ADS with kernel 2.6.10. The kernel is configured=

 to support 4 CPM SCCs, of which 1 and 4 are connected on the board.

quoted

quoted

I created device files as follows:

mknod /dev/ttyCPM0 c 204 46
mknod /dev/ttyCPM1 c 204 47
mknod /dev/ttyCPM2 c 204 48
mknod /dev/ttyCPM3 c 204 49

If I boot the kernel using console=3DttyCPM3 I see that it uses SCC4. =

But when I boot with console=3DttyCPM0 and write to the second port using=
 a command like "echo hello > /dev/ttyCPM3" I don't see that anything is =
being outputted to the second console.

quoted

quoted

What am I doing wrong?

Funny - you said that SCC 1 and 4 are connected to the board; than why=20=

quoted

you are enabling SCC2 and SCC3?

This board does have 2 SCCs assigned for UARTs. No need to configure=20=

quoted

SCC2 and SCC3 - this is useless and may lead to kernel crash. This boar=

d=20

quoted

will use in the correct configuration /dev/ttyCPM0 <SCC1> and=20
/dev/ttyCPM1 <SCC4>.

=20
=20
=20

--=20
Sincerely,
Vitaly
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