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

Alexey Brodkin Alexey.Brodkin at synopsys.com
Wed Dec 17 15:24:44 UTC 2014

Hi Thomas,

On Wed, 2014-12-17 at 16:14 +0100, Thomas Petazzoni wrote:
> Dear Alexey Brodkin,
> On Wed, 17 Dec 2014 15:03:12 +0000, Alexey Brodkin wrote:
> > 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.
> Ah, yes I haven't looked at the baudrate issue. Isn't there a way to
> not pass any baudrate to getty, and let it use whatever baudrate is
> already configured on the device?

Probably not. At least in case of Busybox I saw this on attempt to
execute getty without baudrate at all.

BAUD_RATE of 0 leaves it unchanged

BusyBox v1.22.1 (2014-12-15 15:41:48 MSK) multi-call binary.

Open TTY, prompt for login name, then invoke /bin/login

        -h              Enable hardware RTS/CTS flow control
        -L              Set CLOCAL (ignore Carrier Detect state)
        -m              Get baud rate from modem's CONNECT status
        -n              Don't prompt for login name
        -w              Wait for CR or LF before sending /etc/issue
        -i              Don't display /etc/issue
        -f ISSUE_FILE   Display ISSUE_FILE instead of /etc/issue
        -l LOGIN        Invoke LOGIN instead of /bin/login
        -t SEC          Terminate after SEC if no login name is read
        -I INITSTR      Send INITSTR before anything else
        -H HOST    


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