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authorPaul Eggleton <paul.eggleton@linux.intel.com>2014-04-30 13:32:02 +0100
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-04-30 21:52:12 +0100
commit0537269df779532245eb2954e04fc26b3edfed85 (patch)
tree99f0fd917044d55079da3da6c38fabdbabef03ad
parent819ebddae6b78120e5e082423793ff988419b5c4 (diff)
downloadopenembedded-core-contrib-0537269df779532245eb2954e04fc26b3edfed85.tar.gz
scripts/contrib/serdevtry: add script to handle transient serial terminals
When running automated tests (or just generally interacting with) boards whose serial console devices are on the board itself and thus disappear when powered down or practically disconnected, such as the BeagleBone white, some terminal programs (e.g. picocom) will exit when the device disappears and need to be restarted after the serial device returns. This script handles this automatically for such terminal programs. Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-rwxr-xr-xscripts/contrib/serdevtry60
1 files changed, 60 insertions, 0 deletions
diff --git a/scripts/contrib/serdevtry b/scripts/contrib/serdevtry
new file mode 100755
index 0000000000..74bd7b7161
--- /dev/null
+++ b/scripts/contrib/serdevtry
@@ -0,0 +1,60 @@
+#!/bin/sh
+
+# Copyright (C) 2014 Intel Corporation
+#
+# Released under the MIT license (see COPYING.MIT)
+
+if [ "$1" = "" -o "$1" = "--help" ] ; then
+ echo "Usage: $0 <serial terminal command>"
+ echo
+ echo "Simple script to handle maintaining a terminal for serial devices that"
+ echo "disappear when a device is powered down or reset, such as the USB"
+ echo "serial console on the original BeagleBone (white version)."
+ echo
+ echo "e.g. $0 picocom -b 115200 /dev/ttyUSB0"
+ echo
+ exit
+fi
+
+args="$@"
+DEVICE=""
+while [ "$1" != "" ]; do
+ case "$1" in
+ /dev/*)
+ DEVICE=$1
+ break;;
+ esac
+ shift
+done
+
+if [ "$DEVICE" != "" ] ; then
+ while true; do
+ if [ ! -e $DEVICE ] ; then
+ echo "serdevtry: waiting for $DEVICE to exist..."
+ while [ ! -e $DEVICE ]; do
+ sleep 0.1
+ done
+ fi
+ if [ ! -w $DEVICE ] ; then
+ # Sometimes (presumably because of a race with udev) we get to
+ # the device before its permissions have been set up
+ RETRYNUM=0
+ while [ ! -w $DEVICE ]; do
+ if [ "$RETRYNUM" = "2" ] ; then
+ echo "Device $DEVICE exists but is not writable!"
+ exit 1
+ fi
+ RETRYNUM=$((RETRYNUM+1))
+ sleep 0.1
+ done
+ fi
+ $args
+ if [ -e $DEVICE ] ; then
+ break
+ fi
+ done
+else
+ echo "Unable to determine device node from command: $args"
+ exit 1
+fi
+