in some cases we need something to test if uart is actually
properly connected.
Change-Id: I5a16b053164b34bb30ae8370753be12887a85c51
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-on: http://openocd.zylin.com/4194
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>