(Since version Chisel 3.4) Removed for causing issues in Scala 2.12+. You remain free to define io Bundles in your BlackBoxes, but you cannot rely on an io field in every BlackBox. For more information, see: https://github.com/freechipsproject/chisel3/pull/1550.
(Since version ) see corresponding Javadoc for more information.
(Since version 3.2) Use addResource instead