using SCC4 on MPC8272ADS

[Landau, Bracha]

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 SCC1 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 port.

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 at 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.
> 
> -----Original Message-----
> From: Vitaly Bordug [mailto:vbordug at ru.mvista.com]
> Sent: Wednesday, September 21, 2005 2:40 PM
> To: Landau, Bracha
> Cc: linuxppc-embedded list
> Subject: Re: using SCC4 on MPC8272ADS
> 
> 
> Landau, Bracha wrote:
> 
>>I reconfigured the kernel so that only SCC1 and SCC4 are supported. The same thing happens as before.
>>Another bit of info is that if I run with console=ttyCPM1 as a kernel command line parameter, so that u-boot outputs to one port and the kernel outputs to the other, if I type "ls > /dev/ttyCPM0" the system hangs.
>>
> 
> 
> Heh, didn't noticed, that you should use the latest rc of the linux 
> kernel. I used to fix second UART in rc7 AFAIR.
> 
>>-----Original Message-----
>>From: Vitaly Bordug [mailto:vbordug at ru.mvista.com]
>>Sent: Wednesday, September 21, 2005 1:56 PM
>>To: Landau, Bracha
>>Cc: linuxppc-embedded at ozlabs.org
>>Subject: Re: using SCC4 on MPC8272ADS
>>
>>
>>Landau, Bracha wrote:
>>
>>
>>>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.
>>>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=ttyCPM3 I see that it uses SCC4. But when I boot with console=ttyCPM0 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.
>>>
>>>What am I doing wrong?
>>>
>>
>>Funny - you said that SCC 1 and 4 are connected to the board; than why 
>>you are enabling SCC2 and SCC3?
>>
>>This board does have 2 SCCs assigned for UARTs. No need to configure 
>>SCC2 and SCC3 - this is useless and may lead to kernel crash. This board 
>>will use in the correct configuration /dev/ttyCPM0 <SCC1> and 
>>/dev/ttyCPM1 <SCC4>.
>>
>>
>>
> 
> 
> 


-- 
Sincerely,
Vitaly
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