grub and serial

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Hello,
I am trying to enable serial console by editing GRUB boot loader.
What I want is to be able to view in the boot messages of a machine A
which is connected  with a serial cable to machine B. (I want to view
these messages on machine B)

I found this link:
http://www.cyberciti.biz/faq/linux-serial-console-howto/

Following this link I added these lines to /etc/grub/grub.conf:

serial --unit=1 --speed=19200
terminal --timeout=8 console serial

(I know that still I should add console=tty0 console=ttyS1,19200n8 to
the kernel line in grub.conf)

When I rebooted the machine, it hangs.


I am well aware of that it deals with centos/rhel
Any ideas why?

Is there a different way to achieve it ?

Rgs,
Mark
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