# newmon:
# Used to automate the process of updating the monitor.
# Unlike all other downloaded units on the target, the monitor is not
# a file in the file system.  It is the boot code that contains
# (among other things) the code that supports the file system; hence,
# the command "flash ewrite" (erase and rewrite) pointing to the boot
# sector of the flash is used to re-program the monitor.
# Warning:
# When running newmon, there is a duration of time through which if the
# board is reset, it will not reboot.  This is because this script invokes
# commands in the monitor that erase and re-write the boot sector.
#
# Command line syntax:
#
#   newmon {IP_address_of_target} {name_of_file_containing_new_boot_binary}
#
#

###############################################################################
#
# targetcheck():
# Ping the target, if no answer, exit here.
#
targetcheck()
{
	ping $IPADDR
	if [ $? != 0 ]
	then
		exit $?
	fi
}

###############################################################################
#
# filecheck():
# Verify existence of the file, if non-existent, exit here.
#
filecheck()
{
	ls $BINFILE >/dev/null
	if [ $? != 0 ]
	then
		exit $?
	fi
}

###############################################################################
#
# filesize():
# Using wc and awk, load the shell variable FILESIZE with the size of the
# binary file to be downloaded.
#
filesize()
{
	FILESIZE=`wc -c $BINFILE | awk '{printf $1}'`
	echo Download size: $FILESIZE
}

###############################################################################
#
# targetdld():
# Issue a "reset -x" command to the target.  This will pull the target out
# of any application and force it to not autoboot through TFS.  
# Then download the new binary file.
# Note that the "reset -x" command will time out waiting for a response
# from the target.  This is correct because the target has just been reset,
# so it doesn't know it is supposed to respond to anything.
#
targetdld()
{
	echo "***** Updating ppa monitor on $IPADDR..."
	moncmd -w3 $IPADDR "reset -x"	# No response from reset
	ttftp $IPADDR put $BINFILE \$APPRAMBASE
	if [ $? != "0" ]
	then
		exit
	fi
}

###############################################################################
#
# targetprgm():
# Issue the flash command sequence that will erase the current boot code and
# then transfer the new boot code (previously downloaded binary) from
# RAM to FLASH.
# Note that the "flash ewrite" command will time out because the monitor
# is reset automatically after the rewrite completes; hence, it can't
# respond.
#
targetprgm()
{
	moncmd $IPADDR "flash opw"
	moncmd -w 2 $IPADDR "flash ewrite \$BOOTROMBASE  \$APPRAMBASE $FILESIZE"
}

###############################################################################
###############################################################################
#
# main():
# 
if [ $# != 2 ]
then
	echo Usage: $0 IP filename
	exit 1
fi
IPADDR=$1	# Arg1: IP address of target
BINFILE=$2	# Arg2: Name if binary file (typically this is mon68.binary)
targetcheck	# Verify target presence with a ping.
filecheck	# Verify file existence.
filesize	# Save file size in FILESIZE shell var.
targetdld	# Reset target and download new binary.
targetprgm	# Reprogram the flash with the new binary.