#! /bin/sh

set -e

ab_list() {
	ab=`find /sys/bus/astribanks/devices/xbus-*/ -name waitfor_xpds 2> /dev/null || :`
	if [ "$ab" = "" ]; then
		ab=`find /proc/xpp/XBUS-[0-9]*/ -name waitfor_xpds 2> /dev/null || :`
		procfiles=1
	fi
	if [ "$ab" = "" ]; then
		echo 1>&2 "$0: No XBUSES to wait for. Aborting..."
		exit 1
	fi
	if [ -n "$procfiles" ]; then
		echo 1>&2 "$0: No /sys attributes, fallback to /proc interface..."
	fi
	echo $ab
}


while
	if ! ab=`ab_list`; then
		exit 1
	fi
	test "$oldab" != "$ab"
do
	oldab="$ab"
	echo 1>&2 "Waiting for XPDS"
	cat $ab
done