Squashed 'yocto-poky/' content from commit ea562de
git-subtree-dir: yocto-poky
git-subtree-split: ea562de57590c966cd5a75fda8defecd397e6436
diff --git a/scripts/contrib/serdevtry b/scripts/contrib/serdevtry
new file mode 100755
index 0000000..74bd7b7
--- /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
+