serial tty name

Igor Grinberg grinberg at
Wed Dec 14 10:10:10 EST 2011

Hi Richard,

On 12/14/11 16:43, Richard Zhao wrote:
> How to map different uart port to ttymxc0 (take imx for example)?
> In rootfs, it usually "getty ttymxc0"  to get
> serial console. And the rootfs may be shared by different boards.
> Traditionaly way is to set right platform device ID.
> But with DT, UART2 always generate ttymxc1, UART3 for ttymxc2. You
> always needs to modify the getty command when your change another board.
> Is there a way to fix it?

As for fix in userspace, you can spawn getty on every ttymxc*,
so you will get it always.

Another (userspace) fix would be:
Instead of getty, add a script (say which will do something like:
CONSOLE=`cat /proc/cmdline | tr " " "\n" | grep console= | tr "=" " " | tr "," " "`
TTY=`echo $CONSOLE | cut -d' ' -f 2`
SPEED=`echo $CONSOLE | cut -d' ' -f 3`

/sbin/getty -L $TTY $SPEED vt100

I use the above, because I have not just multiple boards,
but multiple platforms each with its own tty name...


More information about the linux-arm-kernel mailing list