The only allowed parameter is the string "enable"
Change-Id: Iefdad38f1b4177e4194e58caf2be654357299ded
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5021
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>