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
