The state machine of cortex-m have to pass through a set of state before it get in "halted". Add one more "arp_poll" to achieve the proper state during a "reset halt" command in engineering boot. Change-Id: I90828bf20ef75bd4018f8b911f727ae69c4d6e8f Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/5649 Tested-by: jenkins Reviewed-by: Richard Braun <rbraun@sceen.net>