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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>