From: Vitaly Bordug <vbordug@ru•mvista.com>
To: "Landau, Bracha" <BLandau@nds•com>
Cc: linuxppc-embedded list <linuxppc-embedded@ozlabs•org>
Subject: Re: using SCC4 on MPC8272ADS
Date: Wed, 21 Sep 2005 15:40:21 +0400 [thread overview]
Message-ID: <433146A5.7010008@ru.mvista.com> (raw)
In-Reply-To: <02AA386EB831044F8537A696BA785C78076299@ILEX5.IL.NDS.COM>
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@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:
>
>>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
next prev parent reply other threads:[~2005-09-21 11:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-21 11:33 using SCC4 on MPC8272ADS Landau, Bracha
2005-09-21 11:40 ` Vitaly Bordug [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-09-22 15:20 Landau, Bracha
2005-09-21 10:21 Landau, Bracha
2005-09-21 10:55 ` Vitaly Bordug
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