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#!/bin/sh
####################################################################################
# This script is use to automatic start serial console once power up.
# Script enhancement has been done base on Bug YOCTO 10844.
# Configuration can be done in meta/conf/machine/*.conf variable SERIAL_CONSOLES.
# Most of the information is retrieve from /proc virtual filesystem which
# contain all the runtime system information (eg. system memory, device mount, etc).
####################################################################################
# Get active serial filename.
active_serial=$(grep "serial" /proc/tty/drivers | grep -oh "^\s*\S*")
# Re-phrase input parameter from ttyS target index (ttyS1, ttyS2, ttyAMA0, etc).
runtime_tty=$(echo $2 | grep -oh '[0-9]')
for line in $active_serial; do
# File is availability, file content current active serial target index.
if [ -e /proc/tty/driver/$line ]
then
# File content a lot of unknown serial. We use -v to remove all unmatch and get left off.
# Tail use to avoid 1st line included into the filter because 1st line is file description.
activetty=$(grep -v "unknown" /proc/tty/driver/$line | tail -n +2 | grep -oh "^\s*\S*[0-9]")
for active in $activetty; do
# Check if both index is match then proceed to enable the serial console.
if [ $active -eq $runtime_tty ]
then
if [ -c /dev/$2 ]
then
/sbin/getty -L $1 $2 $3
fi
break
fi
done
fi
done
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