forked from brl/citadel
44 lines
1.4 KiB
Bash
44 lines
1.4 KiB
Bash
#!/bin/sh
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###############################################################################
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# This script is used to automatically set up the serial console(s) on startup.
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# The variable SERIAL_CONSOLES can be set in meta/conf/machine/*.conf.
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# Script enhancement has been done based on Bug YOCTO #10844.
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# Most of the information is retrieved from /proc virtual filesystem containing
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# all the runtime system information (eg. system memory, device mount, etc).
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###############################################################################
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# Get active serial filename.
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active_serial=$(grep "serial" /proc/tty/drivers | cut -d/ -f1 | sed "s/ *$//")
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# Rephrase input parameter from ttyS target index (ttyS1, ttyS2, ttyAMA0, etc).
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runtime_tty=$(echo $2 | grep -oh '[0-9]')
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# Backup $IFS.
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DEFAULT_IFS=$IFS
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# Customize Internal Field Separator.
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IFS="$(printf '\n\t')"
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for line in $active_serial; do
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# Check we have the file containing current active serial target index.
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if [ -e "/proc/tty/driver/$line" ]
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then
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# Remove all unknown entries and discard the first line (desc).
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activetty=$(grep -v "unknown" "/proc/tty/driver/$line" \
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| tail -n +2 | grep -oh "^\s*\S*[0-9]")
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for active in $activetty; do
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# If indexes do match then enable the serial console.
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if [ $active -eq $runtime_tty ]
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then
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if [ -c /dev/$2 ]
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then
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/sbin/getty -L $1 $2 $3
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fi
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break
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fi
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done
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fi
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done
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# Restore $IFS.
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IFS=$DEFAULT_IFS
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