Follow-up Comment #1, bug #28628 (project grub):
Turn out a figure out a way that works good enough:
echo -e "nnTesting serial."
echo "If I see ESC from serial within 10 seconds"
echo "I will give over grub console to the serial port."
serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
terminal_input serial
terminal_output serial
#For some reason the "clear" command has been removed
echo -e "nnnnnnnnnnnnnnnnnnnnnnnnnnn"
echo -n "Press ESC within 10 second to take control of console "
if sleep -i -v 10 ; then
echo -e "nnnTimes up, going to console, sorry.nn"
terminal_input console
terminal_output console
else
terminal_output console
echo -e "nnConsole has gone over to the serial port."
terminal_output serial
fi
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