RE: using SCC4 on MPC8272ADS

["Landau, Bracha" <BLandau@nds.com>]

I reconfigured the kernel so that only SCC1 and SCC4 are supported. The s=
ame thing happens as before.
Another bit of info is that if I run with console=3DttyCPM1 as a kernel c=
ommand 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.


-----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:
>=20
> mknod /dev/ttyCPM0 c 204 46
> mknod /dev/ttyCPM1 c 204 47
> mknod /dev/ttyCPM2 c 204 48
> mknod /dev/ttyCPM3 c 204 49
>=20
> If I boot the kernel using console=3DttyCPM3 I see that it uses SCC4. B=
ut 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 b=
eing outputted to the second console.
>=20
> What am I doing wrong?
> =20
Funny - you said that SCC 1 and 4 are connected to the board; than why=20=

you are enabling SCC2 and SCC3?

This board does have 2 SCCs assigned for UARTs. No need to configure=20
SCC2 and SCC3 - this is useless and may lead to kernel crash. This board=20=

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



--=20
Sincerely,
Vitaly
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