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sysvinit-inittab/start_getty: Check /sys for the tty device existence

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The hvc tty driver doesn't populate a file like /proc/tty/driver/serial,
so the current implementation of start_getty doesn't work for the hvc
console. By checking the /sys/class/tty/ for the tty device existence,
it should support more console types and also make the codes more simple.

(From OE-Core rev: 670ceef0f6584ece5ce4176610255226a6148570)

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Kevin Hao
2021-04-07 20:18:11 +08:00
committed by Richard Purdie
parent 7d9a47e623
commit bfbccfd85f
1 changed files with 3 additions and 41 deletions
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44
meta/recipes-core/sysvinit/sysvinit-inittab/start_getty
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@@ -1,17 +1,4 @@
#!/bin/sh
###############################################################################
# This script is used to automatically set up the serial console(s) on startup.
# The variable SERIAL_CONSOLES can be set in meta/conf/machine/*.conf.
# Script enhancement has been done based on Bug YOCTO #10844.
# Most of the information is retrieved from /proc virtual filesystem containing
# all the runtime system information (eg. system memory, device mount, etc).
###############################################################################
# Get active serial filename.
active_serial=$(grep "serial" /proc/tty/drivers | cut -d/ -f1 | sed "s/ *$//")
# Rephrase input parameter from ttyS target index (ttyS1, ttyS2, ttyAMA0, etc).
runtime_tty=$(echo $2 | grep -oh '[0-9]\+')
# busybox' getty does this itself, util-linux' agetty needs extra help
getty="/sbin/getty"
@@ -25,31 +12,6 @@ case $(readlink -f "${getty}") in
;;
esac
# Backup $IFS.
DEFAULT_IFS=$IFS
# Customize Internal Field Separator.
IFS="$(printf '\n\t')"
for line in $active_serial; do
# Check we have the file containing current active serial target index.
if [ -e "/proc/tty/driver/$line" ]
then
# Remove all unknown entries and discard the first line (desc).
activetty=$(grep -v "unknown" "/proc/tty/driver/$line" \
| tail -n +2 | grep -oh "^\s*\S*[0-9]\+")
for active in $activetty; do
# If indexes do match then enable the serial console.
if [ $active -eq $runtime_tty ]
then
if [ -c /dev/$2 ]
then
${setsid:-} ${getty} -L $1 $2 $3
fi
break
fi
done
fi
done
# Restore $IFS.
IFS=$DEFAULT_IFS
if [ -e /sys/class/tty/$2 -a -c /dev/$2 ]; then
${setsid:-} ${getty} -L $1 $2 $3
fi