| #!/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" |
| case $(readlink -f "${getty}") in |
| */busybox*) |
| ;; |
| *) |
| if [ -x "/usr/bin/setsid" ] ; then |
| setsid="/usr/bin/setsid" |
| fi |
| ;; |
| 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 |