From: Vitaly Bordug <vbordug@ru•mvista.com>
To: "Landau, Bracha" <BLandau@nds•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: using SCC4 on MPC8272ADS
Date: Wed, 21 Sep 2005 14:55:53 +0400 [thread overview]
Message-ID: <43313C39.9010608@ru.mvista.com> (raw)
In-Reply-To: <02AA386EB831044F8537A696BA785C78076297@ILEX5.IL.NDS.COM>
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 10:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-21 10:21 using SCC4 on MPC8272ADS Landau, Bracha
2005-09-21 10:55 ` Vitaly Bordug [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-09-21 11:33 Landau, Bracha
2005-09-21 11:40 ` Vitaly Bordug
2005-09-22 15:20 Landau, Bracha
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