When migrating my Grub1 pxegrub setup to grub2 for testing, some of the new
quirks in the serial system have bothered me...
Unlike Grub Legacy, where I can specifiy
the serial console, and have the menu simul-displayed on both vga and serial
(if port actually exists); Grub2 can't simul-display.
As a workaround, I have it display a timeout on vga and display
the menu on serial if no vga input was received. Serial access is
more important in my environment, hence why it has primacy.
This stinks for the occasional vga user whose machine doesn't even
have a serial port (tested on Laptop hardware and with Xen HVM). Grub2 is
just unrecoverrably hung on a phantom port and the box must be
physically rebooted (the default choice from the now-invisible menu does NOT
auto-boot!).
Grub Legacy:
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
Grub2:
terminal console
#you have to light the console first before going to serial!
echo -n "Press ESC to bypass serial console and enter the menu via VGA console...
"
if sleep --verbose --interruptible 3 ; then
set grubconsole=serial
# serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
serial
#I assume that this parameter autodetection is what this thread was actually
about...
terminal serial
else
set grubconsole=vga
fi
Best regards to the Grub2 crew,
Joey
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