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
