serial tty name

Richard Zhao
2011-12-15T00:44:48Z

On Wed, Dec 14, 2011 at 07:33:41PM +0100, Uwe Kleine-K?nig wrote:
> On Wed, Dec 14, 2011 at 05:10:10PM +0200, Igor Grinberg wrote:
> > 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 getty.sh) 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 $SPEED vt100
> > --------------
>
> what about:
>
> eval "$(sed 's/.*console=\([^,]*\),\([0-9]*\).*/tty=\1; speed=\2/'" /proc/cmdline)"
>
> this should prevent getting a "useless use of cat award".
Thanks.
Richard
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K. | Uwe Kleine-K?nig |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
>
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