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start_getty: Over added SERIAL_CONSOLE cause error in userspace log

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Error log will be logged into /var/log/message.
Added in more condition checking on the script. Check
/proc/tty/drivers and /proc/tty/driver/*
file system to retrieve active targeted serial.
Only establish getty with active serial in runtime.

[YOCTO #10844]

Reviewed-by: Saul Wold <sgw@linux.intel.com>
(From OE-Core rev: ac0e9541fe93e866e42914f65a0516b993f0cffe)

Signed-off-by: Choong YinThong <yin.thong.choong@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Choong YinThong
2017-04-13 17:26:39 -07:00
committed by Richard Purdie
parent 2e09dc1be7
commit 65dfeb248b
1 changed files with 34 additions and 4 deletions
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meta/recipes-core/sysvinit/sysvinit-inittab/start_getty
+34 -4
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@@ -1,5 +1,35 @@
#!/bin/sh
if [ -c /dev/$2 ]
then
/sbin/getty -L $1 $2 $3
fi
####################################################################################
# This script is use to automatic start serial console once power up.
# Script enhancement has been done base on Bug YOCTO 10844.
# Configuration can be done in meta/conf/machine/*.conf variable SERIAL_CONSOLES.
# Most of the information is retrieve from /proc virtual filesystem which
# contain all the runtime system information (eg. system memory, device mount, etc).
####################################################################################
# Get active serial filename.
active_serial=$(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