Serial Console

Serial Console

[Carlos Velasco]

Hi,

I have configured kernel to do output to tty0 and ttyS0 (serial console).

LILO:
image = /boot/vmlinuz_2419
  root = /dev/hda3
  label = linux_2419
  append="console=ttyS0,115200n8r console=tty0 vga=0x0301"


However I have seen that if I don't open the serial port from another machine, I can't reboot or boot kernel, as the output seems to freeze until port is open. When I open the serial port, normal operation is resumed.
Is there something to solve this issue?
I would like to use the serial console only when needed not always that I want boot or reboot machine.

Regards,
Carlos Velasco

Re: Serial Console

[Stuart MacDonald]

From: "Carlos Velasco" <carlosev@newipnet.com>
>   append="console=ttyS0,115200n8r console=tty0 vga=0x0301"

I'm don't know the parameter syntax, but are you sure the above is
correct? A) n8r? Perhaps that r should be a 1? B) Can you set the
console twice like that?

> However I have seen that if I don't open the serial port from another
machine, I can't reboot or boot kernel, as the output seems to freeze until
port is open. When I open the serial port, normal operation is resumed.
> Is there something to solve this issue?
> I would like to use the serial console only when needed not always that I
want boot or reboot machine.

It sounds like the serial port is waiting for a signal, like DCD, to
become active before proceeding. I believe this has been discussed
before, have you checked the linux-kernel mailing archive? Use google
to find it.

..Stu

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