[Buildroot] [PATCH] system: add "askfirst shell" as an option for busybox init

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

Hi Thomas,

On Tue, 2014-12-16 at 08:14 +0100, Thomas Petazzoni wrote:
> Dear Alexey Brodkin,
> 
> On Mon, 15 Dec 2014 11:56:24 +0300, Alexey Brodkin wrote:
> > Consider following cases:
> >  * Buildroot only builds rootfs that could be used on systems with
> >    different default serial ports (ttyS0, ttyS1, ttyAMA3 etc)
> 
> To achieve this, there is no need for a new option, just specify
> "console" as the terminal on which to run getty. The only change needed
> is to add "console" to /etc/securetty.

Well, actually putting "console" in BR2_TARGET_GENERIC_GETTY_PORT
resolves only part of issues - need to specify particular tty.

But still we have serial port settings like baudrate.
BR2_TARGET_GENERIC_GETTY_BAUDRATE_x must match your serial port
settings.

So we're loosing flexibility of my approach here, but what is even more
important imagine if there're 2 serial ports in the system and they have
different baudrates but both properly described in kernel bootargs. With
BR2_TARGET_GENERIC_GETTY only 1 console could be used then but not
either of them.

-Alexey