[U-Boot] Prevent dropping into a shell triggered by serial port

[U-Boot] Prevent dropping into a shell triggered by serial port

[sunimohan]

Hi

  I have connected my mini2440 to a Com device using serial port.

when I try to boot, uboot always drops into the shell. If I remove the
serial port connector, it boots happily.

Looks like the Com device is responding to the boot messages from uboot and
uboot is dropping into the shell.

1) Can I prevent messages from uboot  into serial port

2) Can I continue to boot even if I drop into a shell (like automatically
typing "boot" in the shell) with a script like .bashrc equivalent

3) can I totally shutoff the serial port for uboot only

Thanks
Sunitha
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[U-Boot] Prevent dropping into a shell triggered by serial port

[Andrew Dyer]

On Wed, Oct 20, 2010 at 21:28, sunimohan <sunimohan@gmail.com> wrote:
>
> Hi
>
> ?I have connected my mini2440 to a Com device using serial port.
>
> when I try to boot, uboot always drops into the shell. If I remove the
> serial port connector, it boots happily.
>
> Looks like the Com device is responding to the boot messages from uboot and
> uboot is dropping into the shell.
>
> 1) Can I prevent messages from uboot ?into serial port
>
> 2) Can I continue to boot even if I drop into a shell (like automatically
> typing "boot" in the shell) with a script like .bashrc equivalent
>
> 3) can I totally shutoff the serial port for uboot only
>

RTFM

see the main README, doc/README.silent, doc/README.modem,
doc/README.autoboot in u-boot.  There are lots of ways to handle this.

[U-Boot] Prevent dropping into a shell triggered by serial port

[Wolfgang Denk]

Dear sunimohan,

In message <30015548.post@talk.nabble.com> you wrote:
>
> when I try to boot, uboot always drops into the shell. If I remove the
> serial port connector, it boots happily.

If this happens even if you don't transmit data over the serial line
tht you should fix your hardware. Seems you have floating signals, so
add appropriate pull-up or pull-down resistors.

> Looks like the Com device is responding to the boot messages from uboot and
> uboot is dropping into the shell.

Sounds like a hardware-related issue to me.


Best regards,

Wolfgang Denk

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DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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