[Buildroot] target /etc/inittab

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear H Hartley Sweeten,

On Fri, 15 Mar 2013 12:34:02 -0500, H Hartley Sweeten wrote:

> I'm using buildroot to create a rootfs for an ep93xx board. This
> board has 3 serial ports ttyAM0-3. When the rootfs is created I
> get this in the /etc/inittab:
> 
> # Set up a couple of getty's
> tty1::respawn:/sbin/getty 38400 tty1
> tty2::respawn:/sbin/getty 38400 tty2

This is strange, we have removed these since
7d9d09db673abbedc1cc865c213b742e0450268d, which appeared in 2011.05 it
seems. Those lines are no longer part of the default skeleton.

> # Put a getty on the serial port
> ttyAM0::respawn:/sbin/getty -L ttyAM0 57600 vt100 # GENERIC_SERIAL
> #ttyAM1::respawn:/sbin/getty -L ttyAM1 57600 vt100 # GENERIC_SERIAL
> #ttyAM2::respawn:/sbin/getty -L ttyAM2 57600 vt100 # GENERIC_SERIAL

These are not coming from Buildroot default skeleton. Maybe you're
using a modified Buildroot version and not the upstream version?

> The problem is tty1 and tty2. They don't exist on my board and
> give me issues when the board boots. I can't figure out why they
> are being added to /etc/inittab and how to prevent theses getty's
> from showing up.

Just use a recent upstream Buildroot version, those lines are no longer
present in the default inittab.

> Also how do I get a getty on ttyAM1 and ttyAM2?

In a recent upstream Buildroot version, I would do that with a
post-build script.

Make sure to do add a # GENERIC_SERIAL comment at the end of those
additional lines: this # GENERIC_SERIAL is a marker that tells
Buildroot to modify this line to start a getty on the default tty
(which is defined in the Buildroot configuration).

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com