Has anyone ever tried to give a picoBlaze an AXI-lite master interface? Is anyone at Xilinx maybe even already working on this? Would it be a difficult task? Personally I find the AXI interface quite overwhelming with its many signals.
A while back I created an EDK/XPS pcore peripheral for Picoblaze with AXI-lite mastering capability. It has been successfully used in multiple designs, and can be modified to adapt to particular design requirements. I've attached it here. See the DOCs directory for a complete description. It's probably a little dated now, but should be useful as is.