[bug #14893] Grub hangs on unattended boot if serial and console are configured

[anonymous]

Follow-up Comment #2, bug #14893 (project grub):

Hi Everyone,
     I believe I have found the problem. Well, I was able to get mine working
anyway. Here are the changes I needed to make.

#boot=/dev/sda
default=0
timeout=10
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal --timeout=10 console serial
#splashimage=(hd0,0)/grub/splash.xpm.gz
title CentOS (2.4.21-37.ELsmp) (console port output)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-37.ELsmp ro root=/dev/md0 console=ttyS0,9600
console=tty0
        initrd /initrd-2.4.21-37.ELsmp.img
title CentOS (2.4.21-37.ELsmp) (serial port output)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-37.ELsmp ro root=/dev/md0 console=tty0
console=ttyS0,9600
        initrd /initrd-2.4.21-37.ELsmp.img


There are only 2 things that really changed in the grub.conf file and 1
change in the BIOS settings.
1) I changed the order of the terminal line. I mis-understood the
documentation and thought that the terminal would default to serial if it was
first in the list. That apparently is incorrect. It will take the last in the
list. This meant that the terminal line and kernal line were at odds with
each other for an unattended boot. 
I also broke the different boot methods out into their own entries, thus
simplifing matters.
Most of this is all cosmetic or done for simplicity. What apparently was the
real problem was a bios setting on the machine. There is a BIOS setting which
says it will keep the terminal redirection agent active after kernel boot.
Apparently on certain systems, Grub does not handle this being active very
well. The instant I turn this setting off, the system boots up with out
issue. 

Well, I hope this helps.
Chris

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