It is possible to create an IPI design with an external AXI master in Vivado 2015.1.
The design can be exported to SDK and a BSP can be generated, however the external AXI Master address range will be missing form the memory map, and so the defines for the address range will be missing in the xparamters.h file.
Apply the patches attached to this AR, and export the Hardware to SDK again.
The SDK project now contains the external AXI Master address range.
If a BSP had been created without the patch, please DELETE the BSP and create it again.