Hey Mike, Nice to hear that the "custom Xilinx Zynq based board" is still going :wink: Defusedxml is a python package that was added to facilitate adding security to ROS, as it provides protection against a bunch of different XML attacks. This is part of the [SROS](http://wiki.ros.org/SROS) effort to add some security and hardening to ROS. Anyway to get roscore to run, have you tried adding `python-defusedxml` as a dependency here: https://github.com/bulwahn/meta-ros/blob/kinetic-experimental/recipes-ros/ros-comm/roslaunch_1.12.2.bb#L18 I have only done some looking around at OpenEmbeded stuff, and never got around to actually using it so I am not sure if this is the 'right' way to fix this, or if it would even work. Out of curiosity what is the size of the image that comes out the build process? I would think it would quite small relative to a Ubuntu image. Rohan --- [Visit Topic](https://discourse.ros.org/t/meta-ros-kinetic-runtime-issue-with-roscore/1407/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: