Messages in this thread | | | Date | Thu, 8 Dec 2005 10:54:26 +0000 | From | Russell King <> | Subject | Re: wrong number of serial port detected |
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On Wed, Dec 07, 2005 at 09:02:03PM -0600, Jason Dravet wrote: > >As for your 64 VT tty device nodes - these "devices" are created > >dynamically when the device node is opened. The act of opening the > >device node is defined to be the creation event. If the device node > >did not exist, there would be no way to create _any_ virtual terminals. > > I thought there were only 7 tty devices (Ctrl-F1 to Ctrl-F7) for local > system login? Ctrl-F7 being for Xwindows. Did I miss something?
If you look in the "init" configuration file, /etc/inittab, you'll see lines similar to these:
1:2345:respawn:/sbin/mingetty tty1 2:2345:respawn:/sbin/mingetty tty2 3:2345:respawn:/sbin/mingetty tty3 4:2345:respawn:/sbin/mingetty tty4 5:2345:respawn:/sbin/mingetty tty5 6:2345:respawn:/sbin/mingetty tty6
Once "init" has finished bringing up the rest of the system, it will execute the mingetty commands, asking mingetty to open the first 6 ttys. This opening of each tty creates the virtual console, at which point you can switch to it.
If you add:
7:2345:respawn:/sbin/mingetty tty7 8:2345:respawn:/sbin/mingetty tty8
then you'll have login prompts on ctrl-f1 to ctrl-f8, and X will be on tty9 (ctrl-f9).
You could even ask another program to send its output to /dev/tty12, which you'll be able to view via ctrl-f12 - eg, I do this with the system logger on some of my systems. At that point, you'll have login prompts on tty1 to tty8, X on tty9 and something else on tty12.
(Note: you could comment out some of the mingetty lines in inittab, but you should always leave at least one, in case something happens with X and you need an alternative way to log in.)
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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